Artykuły w czasopismach na temat „Reinforced concrete load bearing wall panels”
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Ma, Shaochun, Lianghui Li i Peng Bao. "Seismic Performance Test of Double-Row Reinforced Ceramsite Concrete Composite Wall Panels with Cores". Applied Sciences 11, nr 6 (17.03.2021): 2688. http://dx.doi.org/10.3390/app11062688.
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The research objective of this study was the seismic performance of double-row reinforced ceramsite concrete sandwich wall panels. The feasibility of upgrading a new wall panel from a non-load-bearing partition wall to a load-bearing seismic wall was examined by conducting cyclic load tests on five wall panel specimens. The test piece was a sandwich thermal insulation structure that could achieve a good protection distance between the thermal insulation material and the fire source so that the fire prevention problem could be solved. At the same time, the problem of easy fall-off of the insulation system was also solved. The specimens were divided into three groups, including three double-row reinforced ceramsite concrete sandwich wall panels with different dosages of alkali-resistant glass fiber, a double-row reinforced ordinary concrete sandwich wall panel, and a solid concrete ceramic wallboard. The effects of different dosages of alkali-resistant glass fiber, construction forms, and bearing side plate materials on the seismic performance of the sandwich wall panels were investigated separately for the specimens. From the analysis of the specimen results (damage characteristics, hysteresis curves, energy dissipation capacity, bearing capacity, ductility, longitudinal reinforcement strain, and stiffness degradation), it could be seen that among the five types of wallboard, the double-row reinforced ceramsite concrete sandwich wall panel with 0.3% fiber content had the best ductility and energy dissipation capacity. Adding fiber could solve or improve the problem of the low ultimate bearing capacity of ceramsite concrete as the wallboard’s bearing material. Compared with the same size solid ordinary concrete wallboard, the bearing capacity of the double-row reinforced ceramic concrete sandwich panel was slightly reduced. However, the additional seismic performance indexes were relatively superior. Through the analysis of the test results, it was shown that, when considering the thermal performance and seismic capacity, the new wall panel had good prospects for engineering applications.
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Wissam K. Al-Saraj, Dr, Dr Layth Abdulbari Al-Jaberi, Sahar J. AL-Serai i . "Carbon Fiber Strengthening of Geopolymer Concrete Wall Panels with Iron Fillings". International Journal of Engineering & Technology 7, nr 4.20 (28.11.2018): 399. http://dx.doi.org/10.14419/ijet.v7i4.20.26142.
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Wall is a vertical plate member resisting vertical (in-plane) or lateral loads. Load-Bearing walls were referred to RC wall panels which were commonly used as load-bearing structural members, braced and laterally supported by the rest of the structure, local materials such as Metakaolin and alkaline solutions are used to cast (600x400) mm reinforced concrete wall panels with 40 mm thickness. To find the ultimate bearing capacity and lateral deflection of wall panels. Seven specimens are divided in two groups to study the variation effect of iron filling (0, 0.5, 0.75 and 1.0)% and carbon fiber (225, 125 and 90 )mm spacing center to center of strips. The result shows that the maximum increasing are 17% and 14% for ultimate bearing capacity and cracking load of wall panels respectively, when iron filling is 1%. Also, the using of carbon fiber with 90 mm spacing center to center of strips leds to increasing in ultimate bearing capacity and cracking load by 31% and 7% respectively. Lateral deflection of wall panels was measured and compared with the reference wall to investigate the strengthening effect.
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Hong, Junqing, Shaofeng Zhang, Hai Fang, Xunqian Xu, Honglei Xie i Yuntian Wang. "Structural performance of textile reinforced concrete sandwich panels under axial and transverse load". REVIEWS ON ADVANCED MATERIALS SCIENCE 60, nr 1 (1.01.2021): 64–79. http://dx.doi.org/10.1515/rams-2021-0015.
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Abstract The performance of textile reinforced concrete composite panels (TRCCPs) under the action of pseudo-static load up to collapse was evaluated. The test of TRCCPs under axial and transverse loading was conducted, and the results were compared with those for steel wire mesh reinforced-concrete composite panels (SMRCCPs). Ceram-site concrete was utilized as the panel matrix owing to its lightweight and insulation characteristics. The ultimate load bearing capacity, load-deformation and load-strain relationships, and failure modes were discussed and investigated in comparison with the findings of non-linear finite-element-model (FEM) analysis and the analytic method on the basis of the reinforced concrete (RC) theory. The analysis results indicate that TRCCP is suitable for use as a potential structural member for a wall or slab system of buildings, and the typical RC theory can be applied to predict the ultimate load bearing capacity if modified suitably.
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Zhao, Kao Zhong, Jian Feng Li i Feng Wang. "Experimental Study on Local Compression of Concrete-filled Glass Fiber Reinforced Gypsum Wall Panel". Advanced Materials Research 671-674 (marzec 2013): 668–73. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.668.
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The concrete-filled glass fiber reinforced gypsum wall panel is a kind of panel that the inside cavums of the glass fiber hollow gypsum panel is filled with concrete. The experimental results indicate that the concrete-filled glass fiber reinforced gypsum wall panel which has a better performance of the force and can be used to be the bearing wall of a building can form a novel structural system. When the beams supporting the wall panels, the wall panels which under the beams is in local state of compression. It were gained that when the wall panels are in the local compression state , local pressure loads are primarily borne by the concrete core columns and fiber gypsum board will damage in advance through the eighteen experimental wall panel specimens which in local compression. The test results show that the final destruction of the concrete is caused by being crushed and the contribution of the gypsum wall panel to local compression bearing is small. Compressive stress can only spread in the local loading on concrete core columns, cannot be expanded into an adjacent stud. Finally, the local compression bearing capacity calculation formula of the concrete-filled glass fiber reinforced gypsum wall panel is obtained by analysis of the test results.
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H. Maneetes i A. M. Memari. "Finite Element Modeling of Reinforced Concrete Cladding Panels H." Electronic Journal of Structural Engineering 9 (1.06.2009): 62–72. http://dx.doi.org/10.56748/ejse.9118.
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Architectural precast concrete cladding systems are considered non-load bearing wall systems and are designed primarily to transfer their self-weight and out-of-plane lateral loads to the supporting building structure. They are typically not designed for significant structural in-plane forces resulting from cladding-structure interaction. In fact, modern earthquake-resistant design requires that these cladding panels be isolated from the lateral force-resisting system. Finite element technique was employed to study precast concrete panels and special modeling strategies were developed for panel connections to the structural frame. The precast concrete panel was designed to participate in the building lateral force-resisting. Finite element modeling techniques were adopted to better understand the strength and stiffness characteristics of these concrete cladding panels subjected to significant in-plane loading. Good correlation was obtained between finite element modeling results and existing experimental results. The analytical results were used to develop a simplified mathematical model that can be incorporated into suitable building models to evaluate its performance as a lateral force-resisting system to withstand earthquake-induced lateral loads.
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Kazi, Mohammadzunoor, i Sandip P. Chandresha. "Comparative Study on Expanded Polystyrene (EPS) Core Reinforced Concrete Sandwich Panels based and R.C.C Brick Infill Structure". International Journal for Research in Applied Science and Engineering Technology 10, nr 6 (30.06.2022): 324–30. http://dx.doi.org/10.22214/ijraset.2022.43690.
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Abstract: Now a day Expanded Polystyrene (EPS) Core Reinforced Concrete Sandwich Panels (RCSP) is become more popular building material, Due to it's low Weight, low Thermal Conductivity and low construction time. Also it provide more work ability for the mass production of building. EPS Core (80mm to 120mm) RCSP Panel consist of EPS Core Between two layers of Reinforce concrete, 2mm to 3mm diameter welded coated steel wire mesh use as a Reinforce in concrete. Two Welded wire mesh is connected buy shear connecter of 2mm to 4mm diameter. Up to four story Expanded Polystyrene (EPS) Core Reinforced Concrete Sandwich Panels (RCSP) is using as load bearing wall. And construct structure without beam and column. In this study focus is on comparing G+3 Building using Expanded Polystyrene (EPS) Core Reinforced Concrete Sandwich Panels (RCSP) Located at North Indian city of Sonepat. With Reinforced cement concrete framed structure consist Brick masonry as infill material. In this study building is considered for analysis which is located in zone 5 earth quake region. Static analysis is done using SAP2000 software, soil conditions are to be soft and importance factor is to be taken as 1.2. Various parameters studied like lateral displacement of building, storey drift, base shear, and moment’s and shear force diagrams for a particular beam for both case. Results are represented in graphical as well as in tabular form. The structural members are modelled with the SAP2000 software package. Dead load and live load is considered as per code IS 875:1987 part 1 &2. Keyword: Concrete sandwich Panel, Diagonal Strut, Non-Linear Time History Analysis.
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Fofiu, M., A. Bindean i V. Stoian. "Seismic Performance Of A Precast Reinforced Concrete Wall With Cut-Out Opening Retrofitted Using Carbon Fibre Strips". Journal of Applied Engineering Sciences 5, nr 1 (1.05.2015): 15–22. http://dx.doi.org/10.1515/jaes-2015-0002.
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Abstract The Precast Reinforced Concrete Wall Panel (PRCWP) presented in this paper is part of an experimental study regarding the seismic performance of precast reinforced concrete wall panels, strengthening strategies and investigation on the weakening induced by modifying the opening in these elements due to architectural demands, change of function of buildings or other reasons. The element presented is 1:1.2 scale typical Reinforced Concrete Wall Panel with a window opening used in Romania, in which the opening was changed to a door opening due to comfort considerations. The specimen was subjected to cyclic loading with the lateral loads being applied in displacement control of 0.1% drift ratio. This simulates the shear behaviour of the element. After testing the unstrengthen element we proceed to retrofit it using Carbon Fibre Strips anchored with Carbon Fibre Mash. The purpose of the paper is to present the strengthening strategy and restore the initial load bearing capacity of the element or even increase it. The experimental results of strengthen and unstrengthen specimens will be presented.
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Nandan, Nandan A., i R. Renjith. "Experimental Investigation on Use of Shredded Thermocol to Formulate a Light Weight Concrete Mix for Concrete Filled GFRG Panels". Applied Mechanics and Materials 857 (listopad 2016): 82–87. http://dx.doi.org/10.4028/www.scientific.net/amm.857.82.
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Glass fiber reinforced gypsum panels (GFRG) are hollow panels made from modified gypsum plaster and reinforced with chopped glass fibers. The hollow cores inside the walls can be filled with in-situ concrete/reinforced concrete or insulation material to increase the structural strength or the thermal insulation, respectively. GFRG panels can be unfilled when used as partition walls, but when used as load bearing walls, it is filled with M20 grade concrete (reinforced concrete filling) in order to resist the gravity and lateral loads. The study was conducted in two stages: First stage involves formulation of an alternate light weight mix to be used in the GFRG panels in lieu of M20 grade concrete by partial replacement of cement with phosphogypsum and fine aggregate with shredded thermocol and thereby conducting experimental investigations to obtain the optimum combination. In the second stage the above formulated mix is filled in GFRG panels and experimental investigations are conducted to evaluate the strength parameters and the results are compared with the panels filled with conventional M20 concrete mix. The results of the first stage of experimental investigations are presented in this paper.
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Demeter, I., T. Nagy-Gyögy, V. Stoian, C. Dăescu i D. Dan. "Strengthening strategies using FRP composites for precast RC wall panels with cut-out openings". International Review of Applied Sciences and Engineering 2, nr 1 (1.06.2011): 19–24. http://dx.doi.org/10.1556/irase.2.2011.1.3.
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Abstract Building structures using Precast Reinforced Concrete Wall Panels (PRCWP) are widely used in Romania. An important disadvantage of these buildings is the functional rigidity of the interior space due to the dense distribution of the load bearing walls. Cut-out openings are often required to facilitate direct access from outside or between adjacent apartments. This paper presents a part of research program regarding the effectiveness of using the Externally Bonded Carbon Fiber Reinforced Polymer (CFRP-EBR) composites as seismic retrofitting solution for PRCWPs weakened by cut-out openings. The discussion was focused on the strengthening strategies adopted for both narrow and wide door openings.
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Sun, Jian, Hongxing Qiu i Hongbo Jiang. "Lateral load behaviour of a rectangular precast shear wall involving vertical bolted connections". Advances in Structural Engineering 22, nr 5 (8.11.2018): 1211–24. http://dx.doi.org/10.1177/1369433218807685.
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This article is concerned about precast reinforced concrete shear walls and the methods of assembling shear wall panels to form a reliable load transfer system. An assembling method is proposed using dry connection through an H-shaped steel connector (H-connector) and high-strength bolts. A preliminary design, including the H-connector design and bolt design, has been carried out based on the force analysis on the vertical connection in the wall assembly. On the basis of the finite element analysis verified by an experimental study, the preliminary design has been confirmed and a monolithic coefficient ( ζ) has been used to evaluate the cooperative working performance of the two parallel shear walls. Then this article continues to carry out a finite element parametric study on the mechanical behaviour of the precast reinforced concrete shear walls with varying parameters, which includes the bolt specification, the frictional coefficient on the contact surface within the bolted connection and the thickness of the H-connector flange. The lateral load bearing capacity, lateral stiffness and cooperative working performance of the wall assemblies involving these varying parameters have been broadly analysed.
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La Tegola, Antonio, i Walter Mera. "Characterization of Cementitious Mortar Reinforced with NFRC for Load-Bearing Masonry". Key Engineering Materials 916 (7.04.2022): 465–71. http://dx.doi.org/10.4028/p-5a8vgc.
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The latest seismic events in Ecuador have allowed to verify some damage typologies on masonry panels of reinforced concrete buildings with frame resistant structures. Therefore, some theoretical and experimental research have been carried out to justify the intervention for repairing the damage to the masonry walls to give them a certain degree of shear ductility to provide for compatibility of the lateral deformations of the structure and of the masonry panels.
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Fofiu, Mihai, Andrei Bindean i Valeriu Stoian. "Carbon Fiber Strips Retrofitting System for Precast Reinforced Concrete Wall Panel". Key Engineering Materials 660 (sierpień 2015): 208–12. http://dx.doi.org/10.4028/www.scientific.net/kem.660.208.
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This paper presents the retrofitting procedure used on a precast reinforced concrete wall panel (PRCWP) in order to restore its initial load bearing capacity. The specimen used in this experimental test is one from the residential multistoried buildings constructed in Romania from the 1970 onwards. All of the characteristics of the element are from the specific era, only scaled down with a factor of 1:1,2. The element was subjected to in-plane reversed cyclic loading to simulate its seismic behavior and obtain its maximum load bearing capacity. After the test we retrofitted the element using Carbon Fiber Strips Externally Bonded (EBR) and anchored with Carbon Fiber Reinforced Polymers (CFRP) mesh. The porpoise of the paper is to compare the maximum loading bearing capacity of the unstrengthen and strengthen elements in order to compare them and examine the efficiency of this retrofitting procedure.
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Skadiņš, Ulvis, Kristens Kuļevskis, Andris Vulāns i Raitis Brencis. "Thin-Layer Fibre-Reinforced Concrete Sandwich Walls: Numerical Evaluation". Fibers 11, nr 2 (9.02.2023): 19. http://dx.doi.org/10.3390/fib11020019.
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In this study, structural thin-layer sandwich walls (SWs) made of steel-fibre-reinforced concrete (SFRC) without conventional reinforcements were investigated. Other researchers have shown that SWs with thin wythes can be used as load bearing structures in low-rise buildings, thereby reducing the amount of concrete by 2–5 times if compared to conventional reinforced-concrete SWs. In most studies, relatively warm climatic regions are the focus, and thin-layer SWs with shear connectors to obtain a certain level of composite action are investigated. In almost no studies has sound insulation been evaluated. In this study, a numerical investigation of structural, thermal and sound insulation performances was carried out. The load-bearing capacities of composite and non-composite SWs are compared. Regions with the lowest five-day mean air temperature of −20 ∘C were considered. The characteristics of the SW are compared to the requirements given in relevant European and Latvian standards. The minimum thermal insulation for family houses varies from 120 mm to 200 mm, depending on the material. To ensure sufficient sound insulation, the average thickness of the concrete wythes should be around 60 mm, preferably with a 15 mm difference between them. Structural analysis of the proposed wall panel was performed using non-linear finite element analysis software ATENA Science. The obtained load-bearing capacity exceeded the design loads of a single-story family house by around 100 times, regardless of the degree of composite action.
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Su, Yi Sheng, Yue Chun Luo, Guo Liang Jiang, Jin Yun Quan i Yi Shen. "Seismic Analysis of Fly Ash Plate Sandwich Polyurethane Insulation Composite Wall". Applied Mechanics and Materials 275-277 (styczeń 2013): 1003–7. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1003.
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In order to study the seismic stress performance of the reinforced concrete frame assembly fly ash plate sandwich polyurethane composite wall insulation system (FW). In this paper, 2 bay single-layer single-span hollow fly ash plate sandwich polyurethane in filled frames were tested under low cyclic horizontal loadings with different ratio of high to width and different stiffness frame . Based on the experiment, the damage process, failure mode, load carrying capacity are studied. The interaction between the fly ash plate sandwich polyurethane infill walls and the overall frame of constraint system are investigated. The results indicate that the bearing capacity has little related to height-width ratio of wall; sandwich polyurethane wall panels and frame has good integrity and energy dissipation capacity; the ratio of high to width smaller, ductility of wall is better . After study the failure pattern of the specimen, we know that the bearing capacity of fly ash powder polyurethane thermal insulation wall is not accord with formula of seismic shear of not bearing masonry.
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Sun, Guohua, Fei Li i Qiyou Zhou. "Cyclic Responses of Two-Side-Connected Precast-Reinforced Concrete Infill Panels with Different Slit Types". Buildings 12, nr 1 (28.12.2021): 16. http://dx.doi.org/10.3390/buildings12010016.
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This study aimed to study the cyclic behavior of two-side-connected precast-reinforced concrete infill panel (RCIP). A total of four RCIP specimens with different slit types and height-to-span ratios modeled at a one-third scale were tested subjected to cyclic lateral loads. The failure mode, hysteretic behavior, lateral strength, stiffness degradation, ductility, and energy dissipation capacity of each RCIP specimen were determined and analyzed. The specimens experienced a similar damage process, which involved concrete cracking, steel rebar yielding, concrete crushing, and plastic hinge formation. All the specimens showed pinched hysteretic curves, resulting in a small energy dissipation capacity and a maximum equivalent viscous damping ratio lower than 0.2. The specimens with penetrated slits experienced ductile failure, in which flexural hinges developed at both slit wall ends. The application of penetrated slits decreased the initial stiffness and lateral load-bearing capacity of the RC panel but increased the deformation capacity, the average ultimate drift ratios ranged from 1.41% to 1.99%, and the lowest average ductility ratio reached 2.48. The specimens with high-strength concrete resulted in a small slip no more than 1 mm between the RC panel and steel beam, and the channel shear connectors ensured that the RC infill panel developed a reliable assembly with the surrounding steel components. However, specimens with concealed vertical slits (CVSs) and concealed hollow slits (CHSs) achieved significantly higher lateral stiffness and lateral strength values. Generally, the specimens exhibited two-stage mechanical features. The concrete in the CVSs and CHSs was crushed, and flexural plastic hinges developed at both ends of the slit walls during the second stage. With increasing concrete strength, the initial lateral stiffness and lateral strength values of the RCIP specimens increased. With an increasing height-to-span ratio, the lateral stiffness and strength of the RC panels with slits decreased, but the failure mode remained unchanged.
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Nosenko, Viktor, i Ostap Kashoida. "The influence of the rigidity of the joints of the panel house on the stress-deformed state of the foundation structures". Bases and Foundations, nr 44 (27.06.2022): 9–18. http://dx.doi.org/10.32347/0475-1132.44.2022.9-18.
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The work compares the stress-deformed states of the pile foundations of the house depending on the method of modeling the joints of the wall panels.
The use of wall panels is due to the fact that their installation is a relatively fast technological process, but the disadvantage of such buildings is, among other things, the lack of free spatial planning [1]. During the creation of a numerical model, questions arise: what method (type of connection of panel elements to each other) should be used to model the joints of prefabricated reinforced concrete structures and how does this affect the stress-strain state in above-ground structures and foundations?
This paper presents the influence of the adopted decision (chosen method of joint modeling) on the stress-strain state of pile foundations.
A comparison was made of the stress-strain state of the pile foundation (piles and grid), which were obtained using the following joint modeling options:
1) reinforced concrete elements: monolithic floor, monolithic staircase-elevator shaft and prefabricated wall panels are rigidly connected to each other.
2) the joints between reinforced concrete elements are made using the principle of "combination of movements", i.e., the nodes of the finite elements of the structures are stitched and interact with each other on the basis of certain parameters: horizontal joints - only vertical movements are taken into account (combination movements in the HSC along the Z axis); vertical – take into account movement only in the horizontal plane (along the X and Y axes, in GCS);
3) joints between reinforced concrete elements are made using the functionality of PC "Sapphire". Horizontal joints take into account filling with solution (the so-called platform joint), the behavior of which is described by the elastic law of deformation. Vertical joints take into account embedded details, with the help of which elements are connected to each other in the corresponding places foreseen by the project.
It is shown that the choice of modeling option for the joint of reinforced concrete structures affects the VAT not only of the foundation structures, but also of the vertical load-bearing elements of the building (wall panels and monolithic structures of the stair-elevator shaft). When using various joint modeling options, it is possible to obtain quantitative differences in forces from 2 to 20%, and the type of joint practically does not affect the deformation of foundation structures.
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Popescul, Angela, i Serghei Popescul. "Volumetric-Adjustable Formwork for the Construction of Reinforced- Concrete Monolithic Buildings". Intllectus, nr 1 (lipiec 2022): 106–12. http://dx.doi.org/10.56329/1810-7087.22.1.11.
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Reinforced-concrete monolithic buildings offer high seismic resistance due to the lack of joints be-tween load-bearing walls and floors. Thus, the construction of residential, public, socio-cultural rein-forced-concrete monolithic buildings was applied for the first time in Chisinau. A three-dimensional formwork was used as technological equipment, designed for simultaneous pouring of concrete into vertical walls and floors, forming an integral construction. The formwork is made in the form of flat panels or large U-shaped and L-shaped sections, joined by a mechanism of approach and extension to the design dimensions of the concrete room. After the concrete hardens, the structure is transferred by a crane for successive concreting of the next floors.
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Hassan, Tarek K., i Sami H. Rizkalla. "Analysis and design guidelines of precast, prestressed concrete, composite load-bearing sandwich wall panels reinforced with CFRP grid". PCI Journal 55, nr 2 (1.03.2010): 147–62. http://dx.doi.org/10.15554/pcij.03012010.147.162.
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Carstens, Stefan, i Matthias Pahn. "Durability of GFRP connectors under sustained compression load for use in sandwich walls". Acta Polytechnica CTU Proceedings 33 (3.03.2022): 58–62. http://dx.doi.org/10.14311/app.2022.33.0058.
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Precast concrete sandwich panels are used to fulfil the rising thermal requirements. The sandwich walls consist of three layers, a facing, a thermal insulation layer, and a load bearing layer. The two outer layers are coupled by connectors made of glass-fibre reinforced polymer. A lack of knowledge about load-bearing behaviour prevents the removal of sustained compressive loads. In the context of this article, tests under sustained compressive load are presented. To represent closely the in service-conditions of sandwich walls, the examined connectors were subjected to a saturated alkaline concrete environment as well as to a specified stress level till failure occurs. Thus, the experimental setup combines alkaline resistance and creep rupture tests into one comprehensive testing. By using temperature effects as an accelerating factor, reasonable test durations were enabled. The obtained time to failure line was determined to extrapolate the characteristic values of the long-term strength for a service life up to 50 years. The test results are compared and evaluated with existing test results under a sustained tensile load.
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Mander, Thomas J., i Zachery I. Smith. "Composite Steel Stud Blast Panel Design and Experimental Testing". Applied Mechanics and Materials 82 (lipiec 2011): 479–84. http://dx.doi.org/10.4028/www.scientific.net/amm.82.479.
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Based on Federal Aviation Authority (FAA) requirements, project specific blast loads are determined for the design of a new airport traffic control tower. These blast loads must be resisted by exterior wall panels on the control tower, protecting building occupants from intentional explosives attack scenarios. Such blast resistant walls are typically constructed of thick reinforced concrete panels or composite steel plate and rolled sections, as conventional building cladding systems have relatively low blast resistance. While these more robust design approaches are valid, the additional cladding mass they represent will significantly increase the base shear and overturning demand in seismic zones. This paper investigates the use of a light structural system comprised of a steel stud wall assembly partially embedded in a thin layer of concrete to obtain composite action. Fiber reinforced polymer (FRP) composites are also included to increase the blast resistance and aid in keeping the panel weight to a minimum. Two full-scale composite steel stud walls are designed, constructed, and tested dynamically in the BakerRisk shock tube. The stud walls consist of back-to-back 150 mm deep, 14 gauge (1.8 mm thick), cold-formed steel studs spaced at 610 mm on center. Both specimens have a 50 mm thick normal weight concrete layer, reinforced with welded wire mesh that is welded to the stud compression flanges to achieve composite action. Two layers of Tyfo® SEH-51A fiber reinforced composites are used on the tension flange of the steel studs. A single layer of Tyfo® SEH-51A composites is used on the tension face of the concrete layer between the studs for one of the specimens. Web stiffeners are used at the bearing support to prevent premature web crippling shear failure of the specimens. The stud walls are analyzed using single-degree-of-freedom (SDOF) models. A non-linear moment-curvature relationship, accounting for actual material constitutive properties, is used for determining the resistance function of the walls. Blast pressure and impulse data from the shock tube tests is used to compare analytical predictions to the measured displacement-time response. Analytical predictions of panel response for both tests are within ten percent of the observed response based on displacement.
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Chen, Yao, Qian Zhang, Jian Feng i Zhe Zhang. "Experimental Study on Shear Resistance of Precast RC Shear Walls with Novel Bundled Connections". Journal of Earthquake and Tsunami 13, nr 03n04 (czerwiec 2019): 1940002. http://dx.doi.org/10.1142/s1793431119400025.
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This study presents shear resistance of precast reinforced concrete (RC) shear walls. A novel assembling method for upper and lower wall panels is proposed, whereas vertical steel bars are grouped into bundles and effectively connected in preformed holes. To evaluate the feasibility and shear resistance of such a connection method, three specimens of precast shear walls with different horizontal steel bars have been constructed and tested under monotonic loading while subjected to a constant vertical compression. The results show that cracks mainly appear under the line that connects the midpoint of tension side and the corner of the compression side. The weak section of these shear walls is at the top of the preformed holes, and through cracks do not appear at the bottom of walls. These innovative precast shear walls are reliable, and no rebar is pulled out or seriously slipped. The yield load of the shear wall is great, and the stage between yield and failure is satisfactory. The bearing capacity declines slowly after the peak value.
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Kolchedantsev, Leonid, Aleksey Adamtsevich, Olga Stupakova i Alexander Drozdov. "Measures to reduce construction time of high-rise buildings". E3S Web of Conferences 33 (2018): 03062. http://dx.doi.org/10.1051/e3sconf/20183303062.
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The organizational and technological solutions for high-rise buildings construction efficiency increase are considered, primarily – decrease of typical floor construction time and improvement of bearing structures concrete quality. The essence of offered technology is: a concrete mixing station and a polygon mainly for load-bearing wall panels with starter bars casting are located on the building site; for reinforced concrete components manufacturing and butt joints grouting the warmed-up concrete mixtures are used. The results of researches and elaborations carried out by the SPSUACE in area of a preliminary warming-up of concrete mixtures are presented. The possibility and feasibility of their usage in high-rise buildings and of excess height buildings construction including cast-in-place and precast execution are shown. The essence of heat-vibro treating of concrete mixture is revealed as a kind of prior electroresistive curing, and the achieved results are: accelerated concrete strength gain, power inputs decrease, concrete quality improvement. It is shown that the location of a concrete mixing station on the building site enables to broaden possibilities of the “thermos” method use and to avoid concrete mixtures warming up in medium-mass structures erection (columns, girders) during the high-rise buildings construction. It is experimentally proved that the splice between precast elements encased with warmed-up concrete mixture is equal with conjugated elements in strength.
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Nosenko, Viktor, i Oleg Krivenko. "Influence of house bearing construction rigidi-ty of precast reinforced concrete on stress-strain state Continuous Flight Auger (CFA) piles foundations". Bases and Foundations, nr 40 (4.06.2020): 48–57. http://dx.doi.org/10.32347/0475-1132.40.2020.48-57.
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At present, the tendency to build multi-storey residential buildings has become widespread in Ukraine. This is due to a number of reasons: significant increase in land prices in cities, dense urban development and the availability of appropriate equipment for the construction of such structures. One of the most common materials for multi-storey buildings is monolithic reinforced concrete. The main advantage of monolithic structures is the possibility of free spatial planning and the possibility of uniform redistribution of forces in the elements of the frame - the house works as one rigid entire structure. On the other hand, such structures require a long construction time and appropriate highly qualified control of monolithic works. Therefore, as an alternative, prefabricated reinforced concrete structures are used to accelerate the pace of construction.
In this work, the influence of the rigidity of a precast reinforced concrete house on the stress-strain state of CFA piles foundation is investigated. The stress-strain state of a precast reinforced concrete building with two basement options is analyzed: precast and monolithic.
The numerical modeling of the interaction of the system elements is used as a research method: soil base - foundation - aboveground structure.
It was found that the replacement in a prefabricated house only one basement floor of precast concrete on a monolithic one affects the redistribution of forces, so the self-supporting wall is loaded 2.6 times, and the busiest wall, which rests on both sides of the floor slab, is unloaded to 2.1 times.
It was found that in the case of a basement made of precast reinforced concrete with a precast basement the difference efforts in pile heads (under the load-bearing walls) can differ 1.98 times, and in the case of a monolithic one 1.17 times. So it is mean, the monolithic foundation redistributed of efforts between the piles is more uniform.
It is established that the monolithic reinforced concrete basement, in comparison with the prefabricated one, reduces the uneven settlement of the foundation by 2.4 times.
When designing large-panel houses, it is advisable to provide a basement floor monolithic - this will allow to load the fundamental constructions more evenly, which in its reduction reduces the relative deformation of buildings and reduces their cost.
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Tsirigoti, Dimitra, Christina Giarma i Katerina Tsikaloudaki. "Indoor Acoustic Comfort Provided by an Innovative Preconstructed Wall Module: Sound Insulation Performance Analysis". Sustainability 12, nr 20 (19.10.2020): 8666. http://dx.doi.org/10.3390/su12208666.
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The complicated nature of indoor environmental quality (IEQ) (thermal, visual, acoustic comfort, etc.) dictates a multi-fold approach for desirable IEQ levels to be achieved. The improvement of building shells’ thermal performance, imposed by the constantly revised buildings’ energy performance regulations, does not necessarily guarantee the upgrade of all IEQ-related aspects, such as the construction’s acoustic quality, as most of the commonly used insulation materials are characterized by their low acoustic performance properties. From this perspective the SUstainable PReconstructed Innovative Module (SU.PR.I.M.) research project investigates a new, innovative preconstructed building module with advanced characteristics, which can, among other features, provide a high quality of acoustic performance in the indoor space. The module consists of two reinforced concrete vertical panels, between which the load bearing steel profiles are positioned. In the cavity and at the exterior surface of the panel there is a layer of thermal insulation. For the scope of the analysis, different external finishing surfaces are considered, including cladding with slate and brick, and different cavity insulation materials are examined. The addition of Phase Change Materials (PCM) in different mix proportions in the interior concrete panel is also examined. For the calculation of the sound insulation performance of the building module the INSUL 9.0 software is used. The results were validated through an experimental measurement in the laboratory in order to test the consistency of the values obtained. The results indicate that the examined preconstructed module can cover the sound insulation national regulation’s performance limits, but the implementation of such panels in building constructions should be carefully considered in case of lower frequency noise environments.
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Chen, Shenggang, Xiaotong Peng, Chen Lin, Yingying Zhang, Hexiang Hu i Zhengjian He. "Experimental and Analytical Studies of Prefabricated Composite Steel Shear Walls under Low Reversed Cyclic Loads". Materials 15, nr 16 (19.08.2022): 5737. http://dx.doi.org/10.3390/ma15165737.
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Prefabricated composite shear walls (PCSW) consisting of steel plate clapped by single-sided or double-sided prefabricated reinforced concrete (RC) panels have enormous advantages for application as lateral-resisting structures in prefabricated high-rising residential buildings. In this paper, three 1/3-scaled PCSW were manufactured and tested to investigate the seismic performance of PCSW with single-sided or double-sided prefabricated RC panels. The experimental results, including hysteretic and skeleton curves, stiffness and strength degradation, ductility, energy dissipation capability and steel frame effects, were interpreted, compared and summarized. In spite of the RC panels being the same thickness, PCSW with double-sided RC panels had the most outstanding lateral-resisting properties: the highest yield strength and bearing capacity, adequate ductility, plumper and stable hysteresis loop and excellent energy absorption capacity. Finally, a simple predicting equation with a modification coefficient to calculate the effects of boundary steel frame was summarized and proposed to calculate the lateral yield load of the PCSW. All efforts were made to give reliable technical references for the design and construction of the PCSW.
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Hrasnica, Mustafa, Fadil Biberkic i Senad Medic. "In-Plane Behavior of Plain and Strengthened Solid Brick Masonry Walls". Key Engineering Materials 747 (lipiec 2017): 694–701. http://dx.doi.org/10.4028/www.scientific.net/kem.747.694.
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Unreinforced masonry structures are generally vulnerable to earthquake actions. Brittle masonry walls are very stiff and attract considerable seismic forces which cannot be sustained without cracking. In order to enhance ductility and load bearing capacity, certain strengthening techniques need to be applied. An experimental program concerning in-plane behavior of solid clay brick masonry walls was performed at the Institute for Materials and Structures, Faculty of Civil Engineering University of Sarajevo, in cooperation with Institute for Lightweight Structures and Conceptual Design, University of Stuttgart. The physical models include two unconfined unreinforced full scale masonry walls L/H/D=233/237/25cm and two strengthened full scale walls jacketed on both sides with 5cm thick concrete and reinforced with Q196 steel mesh. Twelve reduced scale walls L/H/D = 100/100/25cm were additionally constructed in order to test different strengthening methods which include one-or two-sided jacketing and CFK 150 strips. Specimens were exposed to cyclic shear as well as to monotonic push over loading program for different vertical stress levels with the aim to quantify shear strength, stiffness and energy dissipation. For lower vertical loads the tested walls exhibit rigid body rotation in each displacement cycle. For higher precompression mixed flexural and shear failure mode was registered, characterized by toe crushing and diagonal cracking. No separation of jacketing from the masonry was detected. Numerical models of tested wall panels were developed using finite element programs.
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Čítek, David, Jiří Kolísko, Stanislav Řeháček i Martin Krystov. "Delayed Casting of UHPFRC Elements". Key Engineering Materials 801 (maj 2019): 424–29. http://dx.doi.org/10.4028/www.scientific.net/kem.801.424.
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Because of high durability and excellent material properties, innovative (thin-walled, shell) structures should be designed. Ultra - High Performance Fiber Reinforced concrete might be used for a specific application with very complex design and very complex shape. Usually, in design UHPFRC structure a reinforcement bars are replaced by a scattered reinforcement. Load bearing capacity in bending of the final shell or thin-walled structure might be influenced by many other factors, including fiber distribution, type and orientation, casting position (for example for up-side down casting) of the shell part of the structure and others. Very significant factor should be a cold joint in term of possible time delay between two batches (simulation of breakdown of the mixer, waiting time to air leakage). At the actual paper focus on an experimental program on cold joint between two batches of fresh UHPFRC poured into the thin wall and deck panels with longitudinal rib. These cold joints are caused by time delay between previous and next batch. Time between two batches differs in range of 10 – 90 minutes.
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Kovalenko, Galina V., Irina V. Dudina i Elena V. Nester. "A probabilistic approach to quality control and assessing initial reliability precast reinforced construc-tions". Journal «Izvestiya vuzov. Investitsiyi. Stroyitelstvo. Nedvizhimost» 11, nr 2 (2021): 274–83. http://dx.doi.org/10.21285/2227-2917-2021-2-274-283.
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The study aims to improve methods for assessing the serviceability of prefabricated reinforced con-crete structures based on an integral estimation of their reliability following the operational monitoring of individual parameters. The serviceability criteria of the investigated structures are set on a probabil-istic basis, addressing the main methodology for their field tests according to GOST 8829-94. The proposed non-destructive testing of output is computerised and is carried out every shift together with the versatility of technological factors. The calculation results on the reliability assessment program are a basis for the acceptance of a batch according to the required strength, stiffness, cracking resistance. To develop a probabilistic algorithm for assessing the reliability of works, an optimal calculation model accurately describing stress-strain behaviour (SSB) under loading is necessary. It is demonstrated that a calculation based on design standards and a model with account non-linear nature of deformation occurring in reinforced concrete as elastoplastic material can be used. The reliability and adequacy of the selected models were confirmed by comparing the theoretical data with the results of work field tests performed at the Bratskzhelezobeton plant. As an example, a calculation model for the SSB as-sessment in load-bearing wall panels with applied combined stress (biaxial bending) was substantiated. A methodology and regulations for automated every-shift quality control of precast reinforced con-structions were developed following the versatility of technological factors. Introducing the proposed quality control system to factories manufacturing reinforced concrete products allows the number of structure field tests to be reduced by 6-10 times and the cost of manufactured products by approxi-mately 2.5%.
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Lubloy, Eva. "How does concrete strength affect the fire resistance?" Journal of Structural Fire Engineering 11, nr 3 (6.03.2020): 311–24. http://dx.doi.org/10.1108/jsfe-10-2019-0035.
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Purpose The aim of the research was to investigate the effect of concrete strength on the fire resistance of structures. At first, it may seem contradictory that higher concrete strengths can decrease the fire resistance of building structures. However, if the strength of the concrete exceeds a maximum value, the risk of spalling (the detachment of the concrete surface) significantly. Design/methodology/approach Prefabricated structural elements are often produced with higher strength. The higher concrete strengths generally do not cause a reduction in the load bearing capacity, but it can have serious consequences in case of structural fire design. Results of two prefabricated elements, namely, one slab (TT shaped panel) and one single layer wall panel, were examined. Results of the specimen with the originally designed composition and a specimen with modified concrete composition were examined, were polymer fibres were added to prevent spalling. Findings As a result of the experiments, more strict regulations in the standards the author is suggested including more strict regulations in the standards. It has been proved that to ensure the fire safety of the reinforced concrete structures, it is required after polymer fibres even in lower concrete strength class than prescribed by the standard. In addition, during the classification and evaluation of structures, it is advisable to introduce an upper limit of allowed concrete strength for fire safety reasons. Originality/value As a result of the experiments, the author suggests including more strict regulations in the standards. It has been proved that to ensure the fire safety of the reinforced concrete structures, it is necessary to require the addition of polymer fibres even in lower concrete strength class than prescribed by the standard. In addition, during the classification and evaluation of structures, it is advisable to introduce an upper limit of allowed concrete strength for fire safety reasons.
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Zolina, Tat’yana Vladimirovna, i Pavel Nikolaevich Sadchikov. "The projected effect from acceptance of constructive solutions to ensure the reliability of an industrial facility". Vestnik MGSU, nr 11 (listopad 2015): 68–79. http://dx.doi.org/10.22227/1997-0935.2015.11.68-79.
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The article raises the problem of increasing the reliability of an industrial building bearing the entire set of frame disturbances. One of the ways to solve it is to mount extra structural elements, previously unrecorded in the design of the object. During the study we examined some of them: installation of mechanical transverse stiffening diaphragms; increasing the rigidity of the column part above the crane; arranging connecting rods located in levels of covering in the temperature seam and crane beams. Choosing the most effective option is determined by constructive and technological features of the research object. In our case, it acts as a one-storey industrial building of hull workshop of Astrakhan maritime shipyard, equipped with overhead cranes. Using this example the calculations, which were carried out, allow estimating the effect from acceptance of constructive solutions for installation of reinforced concrete diaphragms of stiffness at the edges of framework and increase the rigidity of the column part above the crane. During the study four options are considered for calculation scheme using wall panels. These should include representation of the device: as a solid wall; in two columns wide; for large aperture sizes; at the low altitude of the end of the opening. We have presented a comparative analysis of the results before and after the introduction of the corresponding elements in the calculating model of the research object. In the accepted system of constructive measures disc coating with high horizontal rigidity distributes the load on the front diaphragm. Increasing the stiffness of above the tower crane column part gives an additional effect, as an overhead crane is located closer to the cover and in case of the column of more developed section in the above the crane area, it passes the covering greater effort. In its turn, it prevents the transverse displacement and rotation, involving the entire framework into operation. The introduction of these measures contributes to: equal declining of displacements of stresses loads from the action of the nodal points of the frame, both in the level of brake beams and in the surface level; increasing the period of achieving the object’s maximal allowable condition and an extended period of its faultless operation.
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Zhao, Kao Zhong, Feng Wang i Xiao Feng Bian. "Experimental Study on Concrete-Filled Glass Fiber Reinforced Gypsum Wall Panel Compression Members". Advanced Materials Research 446-449 (styczeń 2012): 16–22. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.16.
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The concrete-filled glass fiber reinforced gypsum wall panel is a kind of panel that the inside cavums of the glass fiber hollow gypsum panel are filled with concrete, which can be used as the bearing wall of a building. The influences of eccentricity distance and height to thickness ratio on the bearing capacity of the compression wall panels were studied, and the failure mechanism and bearing capacity of compression wall panels were gained through the experiments of twenty-seven(nine groups) axial compression wall panel specimens and twenty-seven(nine groups) eccentric compression wall panel specimens. The analysis results indicate that the bearing capacity of compression wall panels is obviously affected by the eccentricity distance and height to thickness ratio, and there is a linear relation between bearing capacity and eccentricity distance. The bearing capacity calculation formula of the concrete-filled glass fiber reinforced gypsum wall panel is obtained by regression analysis, which provides reliable gist for structural design of concrete-filled glass fiber reinforced gypsum wall panel buildings.
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Doh, J. H., i S. Fragomeni. "Ultimate Load Formula for Reinforced Concrete Wall Panels with Openings". Advances in Structural Engineering 9, nr 1 (luty 2006): 103–15. http://dx.doi.org/10.1260/136943306776232954.
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Liu, Wei, Yi Lu Zhang i Wei Xi. "The Research of Test on Load-Bearing Capacity of the New Energy-Saving Panels". Applied Mechanics and Materials 587-589 (lipiec 2014): 378–83. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.378.
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According to transverse load test on two half-scale energy-saving wall panels with different space. It is analyzed these panels with failure processes, failure modes, ultimate bearing capacity, load-deflection curves, concrete load-strain curves and steel load-strain curves. The results show that failure modes, flexural stiffness and ultimate strength of panels are affected by ratio of steel.
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Shi, Yunxing, Yangang Zhang, Kun Ni, Wei Liu i Ye Luo. "Research and practices of large composite external wall panels for energy saving prefabricated buildings". MATEC Web of Conferences 289 (2019): 10012. http://dx.doi.org/10.1051/matecconf/201928910012.
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The production process and application of large composite external wall panels (composite panels for short) are introduced in this paper. Composite panels with both load bearing and thermal insulation were formed by pouring normal concrete (NC) and ceramsite foamed concrete (CFC) continuously according to particular technological requirements, which made two layers into a seamless whole. The layers of NC and CFC are for load bearing and thermal insulation respectively. The composite panels were manufactured in the scale of industrial production, and applied to several energy saving prefabricated buildings successively, instead of polystyrene sandwich composite panels (sandwich panel for short) as external wall panels. There are several obvious advantages of the composite panel over the sandwich panel or outer benzoic board. Firstly, it solved the problems of durability of polystyrene and the complex production process of the sandwich pane, the production process of the external wall was thus greatly simplified. In addition, the fire risk was much reduced.
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Alsaraj, Wissam Kadhim, Shaimaa Hasan Fadhi i Sahar Jabbar Alserai. "Structural Behavior of Geopolymer Concrete Thin Wall Panels Based on Metakaolin and Recycled Concrete Aggregate". Open Civil Engineering Journal 13, nr 1 (31.08.2019): 109–17. http://dx.doi.org/10.2174/1874149501913010109.
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Introduction: Due to the current popularity of Reinforced Concrete (RC) wall construction and the new published codes for concrete, RC walls have become just as important structural elements as beams, slabs and columns. Methods: This paper presents the structural behavior of geopolymer concrete thin wall panels based on metakaolin and recycled concrete aggregate subjected to axial eccentric uniformly distributed loading with varying Aspect Ratios (AR=H/L) and steel reinforcement ratios. The experimental program includes testing of five two-way thin geopolymer concrete wall panels; fixed at all sides and applying the load axially with eccentricity equal to the wall thickness/6. Results and Conclusion: The results indicate that the load-carrying capacity of the geopolymer concrete wall panels increased to about 63% with a decrease in AR (H/L) from 1.875 to 0.75. The lateral deflection decreased to about 50% with a decrease in AR (H/L) from 1.875 to 0.75. Also, the results show that the load-carrying capacity of the geopolymer concrete wall panels increased to nearly 48% with an increase in the steel reinforcement ratio from 2.32% to 3.38%. The lateral deflection also decreased by 20% with an increase in the steel reinforcement ratio to 3.38%. The results show that locally manufactured Metakaolin can be used for producing Geopolymer concrete.
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Xia, Bing Qing, Jun Dong i Lan Zong. "Research Situation of the Unilateral Contact Buckling of Thin Wall Steel-Concrete Composite Panels". Advanced Materials Research 255-260 (maj 2011): 333–37. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.333.
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Thin wall steel-concrete composite wall panels can be used as bearing member and also as maintenance structural plates, which can satisfy functional requirements of building including bearing capacity, heat insulation and preservation. The problem relating unilateral contact buckling of thin wall steel composite panels has received attention from many construction engineers. The investigation progress is analyzed in general and the investigation questions are illustrated. The research approach and technical routes of delaminated critical load are also presented.
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Kanagaraj, Balamurali, Tattukolla Kiran, Jayakumar Gunasekaran, Anand Nammalvar, Prince Arulraj, Beulah Gnana Ananthi Gurupatham i Krishanu Roy. "Performance of Sustainable Insulated Wall Panels with Geopolymer Concrete". Materials 15, nr 24 (9.12.2022): 8801. http://dx.doi.org/10.3390/ma15248801.
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The increase in the population creates an increased demand for construction activities with eco-friendly, sustainable, and high-performance materials. Insulated concrete form (ICF) is an emerging technology that satisfies the sustainability demands of the construction sector. ICF is a composite material (a combination of expanded polystyrene (EPS) and geopolymer concrete (GPC)) that enhances the performance of concrete (such as thermal insulation and mechanical properties). To investigate the axial strength performance, five different types of prototypes were created and tested. Type I (without reinforcement): (a) hollow EPS without concrete, (b) alternative cells of EPS filled with concrete, (c) and all the cells of EPS filled with concrete; and Type II (with reinforcement): (d) alternative cells of EPS filled with concrete; (e) and all the cells of EPS filled with concrete. Amongst all the five prototypes, two grades of GPC were employed. M15 and M20 grades are used to examine the effectiveness in terms of cost. For comparing the test results, a reference masonry unit was constructed with conventional clay bricks. The main aim of the investigation is to examine the physical and mechanical performance of sandwich-type ICFs. The presence of polystyrene in ICF changes the failure pattern from brittle to ductile. The result from the study reveals that the Type II prototype, i.e., the specimen with all the cells of EPS filled with concrete and reinforcement, possesses a maximum load-carrying capacity greater than the reference masonry unit. Therefore, the proposed ICF is recommended to replace the conventional load-bearing system and non-load-bearing walls.
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Rybakov, Vladimir, Anatoly Seliverstov, Denis Petrov, Andrei Smirnov i Anna Volkova. "Lightweight steel concrete structures slab panels load-bearing capacity". MATEC Web of Conferences 245 (2018): 08008. http://dx.doi.org/10.1051/matecconf/201824508008.
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Lightweight steel concrete structures (LSCS) - an innovative building structure type that can be used both as load-bearing and as enclosing one. They consist of profiled steel usually galvanized and cold-bent - filled with a monolithic foam concrete with a 200kg/m3 density, and with fiber cement sheets sheathing. These structures can be used in industrial and civil buildings as internal and external bearing and enclosing wall structures, and as slabs. According to the LSCS production method, prefabricated panels (walls and slabs) and building site performed constructions are distinguished. The article presents the LSCS subspecies, representing slabs panels made of galvanized profiled steel, density medium grade D400 monolithic foam concrete and sheets “Steklotsem” sheathing, bearing capacity experimental studies results. The paper confirms that such panels can be used in civil buildings and withstand the appropriate load, regulated by the current codes and rules. Moreover, it has been experimentally proved that the foam concrete, despite its own extremely low strength class, actually includes in the operation, preventing such effects as stability local loss, crushing and profile steel elements cross-section warping and increases the slabs overall load capacity by 20-25%.
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Zhi, Qing, i Zhengxing Guo. "Experimental evaluation of precast concrete sandwich wall panels with steel–glass fiber–reinforced polymer shear connectors". Advances in Structural Engineering 20, nr 10 (8.01.2017): 1476–92. http://dx.doi.org/10.1177/1369433216683198.
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A new shear connector is proposed in this article. The shear connector is made of steel–glass fiber–reinforced polymer material. Twelve full-scale precast insulated concrete sandwich panels were tested under flexure to analyze their flexural behavior subjected to pressure. The test program was composed of eight sandwich panels with steel–glass fiber–reinforced polymer connectors and four panels for comparison that were panels using stainless steel truss connectors, pure glass fiber–reinforced polymer pin connectors, and no connectors, respectively. Their load–deflection relationships, load–slip relationships, concrete strain profiles along the wythes cross section, as well as the strains in the steel–glass fiber–reinforced polymer W-shaped connectors were investigated in this article. The panels exhibited a composite action in terms of strength exceeding 85% with steel–glass fiber–reinforced polymer connectors and 40 mm insulation thickness. In addition, the other panels with more than 40 mm insulation layer and different diameter connectors only exhibited 26%–62% composite action. When evaluating the degree of the composite action in terms of stiffness, all sandwich panel values ranged from 6% to 26%. But the compared specimens with pure glass fiber–reinforced polymer connector and smaller diameter steel truss connector had lower level composite action less than 10%. Reasonable design of steel–glass fiber–reinforced polymer W-shaped connectors may provide high composite action for panels and prevent the strength from dropping rapidly due to the steel inner core in the connectors.
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Karapetyan, Lusine Gurgen, i Tigran Vardan Ter-Poghosyan. "Study on the New Method of Constructing Shear Walls in Multi-Storey Buildings With Site Cast Reinforced Concrete Frame System". Journal of Architectural and Engineering Research 1, nr 2 (26.12.2021): 41–47. http://dx.doi.org/10.54338/27382656-2021.1-11.
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The article touches upon the comparative analysis of bearing system calculations of a multi-storey residential building with site cast reinforced concrete frame and shear wall constructed by two different methods. In the calculation models, the shear walls are constructed from site cast reinforced concrete in the first case, and from three-layer sound and thermal insulating bearing panels in the second. The calculations have been made considering the impact of the seismic force. According to the calculation results, the dynamic parameters of the bearing systems of the buildings and the economic efficiency indicators have been compared. Considering the fact that in the recent years three-layer sound and thermal insulating panels have been widely used in the world, the study attempted to reveal the efficiency of using such panels in the Republic of Armenia.
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Tian, Peng, Xu Dong Shi, Yuan Qing Wang i Yan Nian Zhang. "Mechanical Behavior Analysis of Reinforced Concrete Column Strengthening with Shear Wall". Applied Mechanics and Materials 438-439 (październik 2013): 696–700. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.696.
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This paper studies the influences of factors such as axial compressive ratio and shear wall thickness on the mechanical performance of the reinforced concrete column strengthening with shear wall under low-cyclic reversed loading. Considering the secondary stress characteristics of the strengthening column, a numerical analysis was made on the load displacement hysteretic curve and skeleton curve. The results show that, with the increasing of axial compression ratio, the bearing capacity and stiffness of reinforced concrete column increased, but the ductility of reinforced column reduced; the bearing capacity and rigidity of reinforced column strengthening with shear wall increase while the ductile was lower; the change of shear wall thickness has a little effect on the bearing capacity, but improves the energy dissipation capacity of reinforced concrete columns.
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Hutchinson, Robin L., Sami H. Rizkalla, Mike Lau i Scott Heuvel. "Horizontal Post-Tensioned Connections for Precast Concrete Load bearing Shear Wall Panels". PCI Journal 36, nr 6 (1.11.1991): 64–76. http://dx.doi.org/10.15554/pcij.11011991.64.76.
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Jabbar Alserai, Sahar, Wissam Kadhim Alsaraj i Layth Abdulbari Aljaberi. "BEARING LOAD CAPACITY of GEOPOLYMER CONCRETE THIN WALL PANELS UNDER ECCENTRIC COMPRESSION". Journal of Engineering and Sustainable Development 24, nr 1 (1.01.2020): 1–14. http://dx.doi.org/10.31272/jeasd.24.1.1.
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Čech, Jindřich, Jiří Kolísko, Petr Tej, Petr Pokorný i Alena Kohoutkova. "Experimental and Theoretical Analysis of I-Pillars of Noise Barriers Made of Prestressed Steel Fiber Concrete, Prestressed Concrete and Reinforced Concrete with Footings Length of 600 mm". Key Engineering Materials 709 (wrzesień 2016): 105–8. http://dx.doi.org/10.4028/www.scientific.net/kem.709.105.
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This paper deals with the experimental testing and theoretical analysis of the flexural load-bearing capacity of I-shaped pillars in noise barriers made of reinforced concrete, prestressed concrete and prestressed steel fiber reinforced concrete. The pillars were loaded as a cantilever under a flexural load, which corresponds to their actual loading when the effect of wind on the panels of the noise barrier is taken into account. For the purpose of the present research, three specimens of I-pillars were tested. The results of the experimental loading tests, as well as the calculated results and the comparison between them, are herein presented.
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Lyublinskiy, Valery, i Andrzej Ubysz. "Stress-strain state panel buildings and welded butt joints". E3S Web of Conferences 263 (2021): 02015. http://dx.doi.org/10.1051/e3sconf/202126302015.
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The constructive basis of a multi-story building is the spatial bearing system of buildings. In accordance with the chosen mathematical apparatus of the study, the spatial load-bearing system of a multi-storey building is a discrete vertical reinforced concrete structure formed by shear walls, and united by constant height connections with certain deformability. The above elements of the building support system provide strength, stability and durability of the structure as a whole. The spatial operation of the system is manifested in the fact that when loading one of its elements, other elements are included in the work. The purpose of the present study is to assess the influence shear bonds of the building’s bearing system on its stress-strain state using a specific building.
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Chong, Xun, Linlin Xie, Xianguo Ye, Qing Jiang i Decai Wang. "Experimental study and numerical model calibration of full-scale superimposed reinforced concrete walls with I-shaped cross sections". Advances in Structural Engineering 19, nr 12 (28.07.2016): 1902–16. http://dx.doi.org/10.1177/1369433216649392.
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The superimposed reinforced concrete wall in which both the walls and slabs are semi-precast superimposed reinforced concrete components has been widely used to construct high-rise residential buildings in some seismic regions of China. This article aims to investigate the seismic performance and reveal the inherent damage mechanism of this wall. Quasi-static tests of two full-scale superimposed reinforced concrete walls with I-shaped cross sections, consisting of the walls in orthogonal directions and two T-shaped cast-in-place boundary elements, were conducted. Through the test, the behavior of the horizontal joints between the wall panels and the foundation; the behavior of the vertical connections between the wall panels of orthogonal direction; the reliability of the connections between precast and cast-in-place concrete; and the lateral load, deformation, and energy dissipation capacities of the specimens are evaluated. In addition, a refined numerical model based on the multi-spring model was adopted to assess the seismic performance of the superimposed reinforced concrete walls with I-shaped cross sections. The reliability of this model was validated through comparison with the experimental data. This study offers valuable experimental data and numerical model references for future seismic performance assessments of superimposed reinforced concrete wall structures.
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Rahai, Alireza, Alireza Shahin i Farzad Hatami. "Progressive collapse resisting capacity of reinforced concrete load bearing wall structures". Journal of Central South University 22, nr 7 (lipiec 2015): 2730–38. http://dx.doi.org/10.1007/s11771-015-2803-4.
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Wu, Qin, Huagang Zhang, Hongniao Chen, Xin Zhang, YanHui Wei, Li Li i Kejian Ma. "Seismic Behaviour of Cast-In-Situ Phosphogypsum-Reinforced Concrete Grid Frame Composite Walls". Advances in Civil Engineering 2019 (4.11.2019): 1–17. http://dx.doi.org/10.1155/2019/1529137.
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This paper mainly studies the effect of cast-in-situ phosphogypsum on seismic behaviour of reinforced concrete grid frame. The mechanical behaviour of three reinforced concrete grid frames and four cast-in-situ phosphogypsum-reinforced concrete grid frame composite walls under low cycle alternating load was designed and tested. The test results show that the reinforced concrete grid frame has less bearing capacity and poor energy consumption. The addition of cast-in-situ phosphogypsum can effectively improve the seismic behaviour of the reinforced concrete grid frame. Compared with the reinforced concrete grid frame, the bearing capacity of the cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall is increased by 2-3 times, the displacement ductility coefficient is increased by 0.95∼1.2 times, and the relative accumulative energy consumption is increased by 86%∼216%. This shows that the composite wall has better bearing capacity, ductility, and energy dissipation capacity.
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Zhao, Jun, i Meng Yao. "Experimental Study on Load Behavior of Steel Fiber Concrete Coupled Shear Wall". Applied Mechanics and Materials 438-439 (październik 2013): 682–85. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.682.
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Through low cycle reverse tests of three steel fiber reinforced concrete coupled shear walls, the crack pattern, bearing capacity, stiffness and displacement are analyzed. Test results show that the bearing capacity, yielding stiffness and the anti-crack performance of the coupled shear walls are generally improved by adding steel fibers to reinforced concrete coupling beams, and the stiffness degeneration is also reduced to a certain degree. More cracks are induced by steel fibers bridged the main crack, which can make the shear wall consume more energy.
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Kang, Yan Bo, Shi Min Huang i Qiu Lai Yao. "Seismic Analysis on Masonry Structures Strengthened with Reinforced Concrete Splint". Advanced Materials Research 639-640 (styczeń 2013): 1114–19. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.1114.
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Strengthening the brick walls with reinforced concrete splint is a conventional and effective method of strengthening masonry structures. To the method, the text process and analysis of 6 brick walls strengthened with reinforced concrete splint and the existing calculation analysis method about bearing capacity are introduced in this paper. Through the series of low-cycle repeated load experiments, we study the different performance between unreinforced brick wall and brick wall strengthened with reinforced concrete splint. Based on the analysis, we find the seismic capacity of the brick wall strengthened with reinforced concrete splint such as the bearing capacity and ductility is enhanced clearly. Meanwhile, the calculation parameter in technical specification for seismic strengthening of buildings has good accordance with the experiment results.