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Добірка наукової літератури з теми "Precast reinforced concrete structures"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Precast reinforced concrete structures"

Nakata, Shinsuke. "Present Situation of Precast Reinforced Concrete Structures." Concrete Journal 32, no. 5 (1994): 5–12. http://dx.doi.org/10.3151/coj1975.32.5_5.

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BOB, Corneliu, Andras LEIDAL, and Liana BOB. "Reinforced Concrete Precast Structures with Rigid Connections." IABSE Congress Report 17, no. 7 (January 1, 2008): 380–81. http://dx.doi.org/10.2749/222137908796293073.

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Tho, Vu Dinh, Elena Anatolyevna Korol, Nikolai Ivanovich Vatin, and Hoang Minh Duc. "The Stress–Strain State of Three-Layer Precast Flexural Concrete Enclosure Structures with the Contact Interlayers." Buildings 11, no. 3 (March 1, 2021): 88. http://dx.doi.org/10.3390/buildings11030088.

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Анотація:

The research object was three-layer reinforced precast concrete enclosure structures. The structures consist of heavy concrete B25 in the external layers and polystyrene concrete B1 in the internal layer. The stress–strain state of precast concrete structures during crack formation was studied by considering the influence of contact interlayers between different types of concretes. Stereoscopic microscopy and scanning electron microscopy were used in the experimental study of multilayer concrete blocks. Samples were made with a varied break time from 30 min to two hours between the previous and the next concrete layer placings. The experimental results showed that the contact interlayer with mutual penetration of aggregates into the adjacent concrete layers is formed in the successive layer-by-layer placing of various concretes. The thickness of the contact interlayer was up to 1 cm. The contact interlayer affects the solidity of the concrete layers’ connection and the structure’s stress–strain state. A model and method for calculating cracking in three-layer reinforced concrete structures with contact interlayers based on analytical and numerical calculations are proposed. Experimental data confirm the proposed calculation method. The results of three-layer reinforced concrete beams calculations show that: (i) the difference of the moment during crack formation in three-layer reinforced concrete beams schemes with and without taking into account the contact interlayer can reach 9.9%; (ii) the moment during crack formation obtained according to the proposed method is greater than that obtained according to the scheme of the cross-section conversion from 7.4% to 9.1%.

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Jagtap, Siddhant Millind, Shailesh Kalidas Rathod, Rohit Umesh Jadhav, Prathamesh Nitin Patil, Atharva Shashikant Patil, Ashwini M. Kadam, and P. G. Chavan. "Fibre Mesh in Reinforced Slabs." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 3539–40. http://dx.doi.org/10.22214/ijraset.2022.42986.

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Abstract: Fiber Reinforced Concrete is gaining attention as an effective way to improve the performance of concrete. Fibers are currently being specified in tunneling, bridge decks, pavements, loading docks, thin unbonded overlays, concrete pads, and concretes slabs. These applications of fiber reinforced concrete are becoming increasingly popular and are exhibiting excellent performance The usefulness of fiber reinforced concrete in various civil engineering applications is indisputable. Fiber reinforced concrete has so far been successfully used in slabs on grade, architectural panels, precast products, offshore structures, structures in seismic regions, thin and thick repairs, crash barriers, footings, hydraulic structures and many other applications. This study presents understanding srength of fibre reinforced conceret. Mechanical properties and durability of fiber reinforced concrete.

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Polák, Aleš. "Experimental Verification of Demountable Precast Column System." Applied Mechanics and Materials 827 (February 2016): 259–62. http://dx.doi.org/10.4028/www.scientific.net/amm.827.259.

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Relocation of existing concrete structures requires full or partial demolition, which consumes a lot of energy and thus has a negative impact on the environment. From environmental point of view, demountable precast structures are sustainable. They allow “recycling” to the level of precast elements and so they save significant amounts of energy and materials. Another advantage of these structures is quick assembly without wet processes. A characteristic component of precast reinforced concrete construction system for multi-storey buildings are demountable joints of load-bearing precast reinforced concrete elements. This paper is focused on experimental verification of demountable precast column structure and its demountable steel joints. The experimental research was carried out within TA02010837 “Multipurpose dismantleable prefabricated reinforced concrete building system with controlled joint properties and possibility of repeated use”.

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Joo, Sanghoon. "Structural Performance of Precast Concrete Arch with Reinforced Joint." Journal of the Korean Society of Civil Engineers 34, no. 1 (2014): 29. http://dx.doi.org/10.12652/ksce.2014.34.1.0029.

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Liu, Hongtao, Qiushi Yan, and Xiuli Du. "Seismic performance comparison between precast beam joints and cast-in-place beam joints." Advances in Structural Engineering 20, no. 9 (October 20, 2016): 1299–314. http://dx.doi.org/10.1177/1369433216674952.

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Анотація:

Precast reinforced concrete structures are widely used due to many constructional advantages such as faster construction speed, lower construction cost, being environmentally friendly, higher strength, and so on. To study the seismic performance of precast reinforced concrete structures, tests on beam-to-column joints of precast reinforced concrete structures were conducted under low reversed cyclic loading. In total, four joint specimens were produced in this study, including two precast joints and two cast-in-place joints. In addition to the comparison between different types of joints, the axial compression ratio of column was adopted as the main variable in this study. Analysis was carried out on the basis of the observed joint failure mode and relationships derived from the test data such as hysteresis curves, skeleton curves, stiffness degradation curves, energy dissipation capacities, and sleeve joint strain curves. Despite the closeness of energy dissipation capacity between the precast joints and the cast-in-place joints, they had different failure modes. Precast joints feature a relatively concentrated crack distribution in which the limited number of cracks was distributed throughout the plastic zone of the beam. Cast-in-place joints feature more evenly distributed cracks in the plastic zone, especially at the later stage of the loading. The steel slippage of the precast concrete joints was found influenced by the axial compression ratio. Through this study, it is concluded that seismic resistance capacity of precast concrete joint needs to be considered in design and construction and the grouting sleeve splice could be kept away from the hinge zones when precast concrete structures were used in regions of high seismicity. The results in this study can provide a theoretical basis for seismic design of precast reinforced concrete structures, which in turn can promote the application of precast reinforced concrete structures.

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Zhao, Dong Qi, Yi Jun Tang, Hui Li, Gui Feng Song, and Feng Ling Guan. "The Application Research of Reinforced Concrete Multi-Ribbed Hollow Composite Slab in the Road Slab Culvert." Advanced Materials Research 368-373 (October 2011): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.307.

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Reinforced concrete cover in the road culvert cover design, in order to facilitate the construction, usually using precast reinforced concrete solid slab, but the overall cost is not low. This article researched a reinforced concrete multi-ribbed hollow composite slab, it based on the theory of reinforced concrete multi-ribbed slab structures, using a precast reinforced concrete ribbed slab as the bottom die, then poured reinforced concrete beams and panels rib ,and them constituted a whole stack of reinforced concrete ribbed hollow slab. This kind of cover, compared with the precast reinforced concrete solid cover, is not only good mechanical properties, high integrity, but also saving concrete, steel, and bottom slab appeared smooth and fine, lower construction cost.

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May, Sebastian, Oliver Steinbock, Harald Michler, and Manfred Curbach. "Precast Slab Structures Made of Carbon Reinforced Concrete." Structures 18 (April 2019): 20–27. http://dx.doi.org/10.1016/j.istruc.2018.11.005.

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Folic, Radomir, Damir Zenunovic, and Nesib Residbegovic. "Strength of connections in precast concrete structures." Facta universitatis - series: Architecture and Civil Engineering 9, no. 2 (2011): 241–59. http://dx.doi.org/10.2298/fuace1102241f.

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Анотація:

The available experimental and numerical results of many studies of behavior of reinforced concrete connections for different stages of loading, up to fracture loading, are presented and analyzed in this paper. The problem of beam-column connection (or plate-wall connection) in prefabricated monolithic structures is emphasized. Fracture mechanisms of RC structures, the theoretical basis for their analysis, and the use of fracture mechanics in RC structures were also considered, as well as the mathematical models of prefabricated connections. In order to formulate an adequate mathematical model for calculating the connections, the dominant parameters influencing the behaviour of these connections were analyzed. A failure model for the prefabricated wall - monolithic RC plate connection was formulated. In building the model, the results of implemented experimental and numerical research of prefabricated connection in the MMS system from 2007 were used. Experiences with the implementation of the aforementioned construction system in structures in Tuzla, in the 1980's last century, were additionally used. The proposed mathematical models provide a sufficiently accurate failure assessment of prefabricated reinforced concrete connections.

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Більше джерел

Дисертації з теми "Precast reinforced concrete structures"

Baran, Mehmet. "Precast Concrete Panel Reinforced Infill Walls For Seismic Strengthening Of Reinforced Concrete Framed Structures." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606137/index.pdf.

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Анотація:

The importance of seismic rehabilitation became evident with 1992 Erzincan Earthquake, after which a large number of reinforced concrete buildings damaged in recent earthquakes required strengthening as well as repair. In the studies related to rehabilitation, it has been realized that inadequate lateral stiffness is one of the major causes of damage in reinforced concrete buildings. Recently, economical, structurally effective and practically applicable seismic retrofitting techniques are being developed in METU Structural Mechanics Laboratory to overcome these kinds of problems. The strengthening technique proposed in this thesis is on the basis of the principle of strengthening the existing hollow brick infill walls by using high strength precast concrete panels such that they act as cast-in-place concrete infills improving the lateral stiffness. Also, the technique would not require evacuation of the building and would be applicable without causing too much disturbance to the occupant. For this purpose, after two preliminary tests to verify the proper functioning of the newly developed test set-up, a total of fourteen one-bay two story reinforced concrete frames with hollow brick infill wall, two being unstrengthened reference frames, were tested under reversed cyclic lateral loading simulating earthquake loading. The specimens were strengthened by using six different types of precast concrete panels. Strength, stiffness, energy dissipation and story drift characteristics of the specimens were examined by evaluating the test results. Test results indicated that the proposed seismic strengthening technique can be very effective in improving the seismic performance of the reinforced concrete framed building structures commonly used in Turkey. In the analytical part of the study, hollow brick infill walls strengthened by using high strength precast concrete panels were modelled once by means of equivalent diagonal struts and once as monolithic walls having an equivalent thickness. The experimental results were compared with the analytical results of the two approaches mentioned. On the basis of the analytical work, practical recommendations were made for the design of such strengthening intervention to be executed in actual practice.

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Srour, Mahdi. "Rocking system for seismic protection of reinforced concrete structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3255/.

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SCHWARTZ, CHRIS J. "STRUCTURAL INVESTIGATION OF A FIBER REINFORCED PRECAST CONCRETE BOX CULVERT." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1121016977.

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Susoy, Melih. "Seismic Strengthening Of Masonry Infilled Reinforced Concrete Frames With Precast Concrete Panels." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605563/index.pdf.

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Анотація:

Over 90% of the land area of Turkey lies over one of the most active seismic zones in the world. Hazardous earthquakes frequently occur and cause heavy damage to the economy of the country as well as human lives. Unfortunately, the majority of buildings in Turkey do not have enough seismic resistance capacity. The most commonly observed problems are faulty system configuration, insufficient lateral stiffness, improper detailing, poor material quality and mistakes during construction. Strengthening of R/C framed structures by using cast-in-place R/C infills leads to a huge construction work and is time consuming. On the other hand, using prefabricated panel infills can be preferred as a more feasible, rapid and easy technique during which the structure can remain operational. The aim of this experimental study is to observe the seismic behavior of R/C frames strengthened by precast concrete panel infills by testing different types of panel and connection designs in eight single-story single-bay reinforced concrete frame specimens.

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Júnior, Luiz Álvaro de Oliveira. "Ligação viga-pilar em elementos pré-moldados de concreto solidarizados por concreto reforçado com fibras de aço: análises estática e dinâmica." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-13082012-083304/.

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Анотація:

No presente trabalho, utiliza-se concreto com fibras de aço, traspasse de armaduras e chaves de cisalhamento para desenvolver uma ligação viga-pilar capaz de resistir a ações cíclicas e dinâmicas e que possa ser empregada na pré-moldagem de estruturas de casas de força de usinas hidrelétricas. Para atingir este objetivo, inicialmente foram realizados ensaios de caracterização dos materiais, cujos resultados mostraram aumentos de 34% na resistência à tração na flexão, 16% na resistência à compressão e 33% na tenacidade, comprovando os efeitos benéficos das fibras de aço nas propriedades mecânicas do concreto. Em seguida, foram realizados ensaios de tração em tirantes, cujos resultados sugeriram que um comprimento de 15Ø é suficiente para que a emenda desenvolva as tensões de aderência de modo adequado; e ensaios de cisalhamento, cujos resultados mostraram que a ligação viga-pilar resiste a tensões de cisalhamento direto de até 0,77 MPa. Na sequencia, foram realizados ensaios cíclicos em dois modelos cruciformes para caracterização da ligação (um monolítico e outro de concreto pré-moldado, o qual empregava concreto com 1% de fibras na região da ligação), sendo o carregamento aplicado em cinco níveis de força, cada um com dez ciclos de carregamento e descarregamento. Os resultados desses ensaios mostraram que a ligação do modelo em concreto pré-moldado apresentou 85% da resistência do modelo monolítico e ruptura governada por flexão. Por fim, os ensaios dinâmicos foram realizados nos modelos cruciformes em três diferentes situações (íntegros, fraturados e após ruptura da ligação) para estimar o coeficiente de amortecimento, o qual sofreu uma redução de 31% após o ensaio cíclico. Simulações computacionais foram realizadas para complementar a investigação realizada neste trabalho. Elas mostraram representação aceitável da rigidez, mas não da resistência do modelo.
In the present work, steel fiber reinforced concrete, splicing bars and shear keys are used in order to develop a beam-column connection able to support cyclic and dynamic loadings and which can be used in precasting power houses structures of power plants. To achieve this goal, tests were carried out to characterize the materials, which showed increases of 34% in flexural tensile strength, 16% in compressive strength and 33% in toughness factor, confirming the beneficial effects of steel fibers in mechanical properties of the concrete. Then, tensile tests were carried out on rods, whose results suggested that a length of 15Ø can assure appropriate development of bond stresses through the splice; and shear tests, whose results showed that the beam-column connection resists to shear stresses of up to 0,77 MPa on shear key. After, cyclic tests were performed in two cruciform models in order to characterize the beam-column connection (one monolithic and the other precast concrete, which employed 1% steel fiber reinforced concrete in connection region, being the loading applied in five loading levels, each one in 10 cycles of loading and unloading. Results of these tests showed that precast beam-column connection presented 85% of the strength presented by the monolithic model and bending failure. Finally, dynamic tests were performed in cruciform models in three different situations (uncracked, cracked and after failure) for estimating the damping ratio, which was reduced by 31% after cycles. Computer simulations were performed to complement the research developed in this work. They showed acceptable representation of stiffness, but the strength of the model.

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Mintz, Brandon L. "Development of a Precast Concrete Supertile Roofing System for the Mitigation of Extreme Wind Events." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1665.

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Анотація:

Residential roofs have traditionally formed the weakest part of the structure. The connections of roofs to the walls has lacked a clear load path with the result that the structure is weak at this point, leading to the compromise of the structure. Indeed roofs have multiple points of failure that lead to the weakness of the residential structure as a whole. Even if structural failure does not occur, compromise the roofing membrane can lead to high repair costs and property loss. The failure lies in the complex forming of the roof components as the roof aesthetics are placed to protect the underlayment and the underlayment protects the sheathing and trusses. However, the aesthetics, such as the roof tile, not being structural can be damaged easily and lead to the compromise of the roofing system as well as endangering surrounding structures. The shape of the roof tile lends itself well to structural design. The wave motion leads to structural redundancy and provides a significant ability to provide stiffness. Using the shape of the roof tile, a structure can be created to encapsulate the shape and provide structural strength. The aesthetics are already accounted for in the shape and the shape is strengthened according to necessity. A system has been devised for flexural strength and applicable connections to demonstrate the constructability and feasibility of creating and using such a system. Design concepts are accounted for, the components are tested and confirmed, and a full-scale test is carried out to demonstrate the concepts ability as a system. The outgrowth of this work is to produce design tables that allow the designer the ability to design for certain building conditions. Taking the concepts of flexural strength and wall to roof, panel to panel, and ridge connections, the design is broken down into appropriate design parameters. Tables are developed that allow the concept to be used under different structural conditions and geographical needs. The conclusion allows us to show specifically how the concept can be applied in specific geographical regions.

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Vitálišová, Barbora. "Návrh a posouzení vybraných částí ŽB nosné konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392081.

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The diploma thesis deals with the design of selected parts of reinforced concrete elements of the exhibition room. Simultaneously, the optimization of selected elements according to valid standards and Eurocodes was carried out and the impact of these changes on the economy of construction was developed.

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Konečný, Michal. "Alternativní řešení montovaného železobetonového skeletu výrobní haly." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391882.

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Анотація:

The aim of the thesis is to design a load-bearing precast concrete structure of production facility. Part of the diploma thesis is to design alternative roofing construction including economic comparison. Internal forces analysis was processed by Dlubal RFEM 5.16 software. In order to find out the expected results, were created simple bar models and the spatial model of the structure was processed later. Structural design report was created for selected elements of the concrete structure including drawings.

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Bellucio, Ellen Kellen. "Comportamento de chumbadores embutidos em concreto com fibras de aço para ligações viga-pilar de concreto pré-moldado." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24052016-111520/.

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Анотація:

O presente trabalho trata do estudo do comportamento de chumbadores grauteados inseridos em concreto com fibras de aço em ligações viga-pilar de estruturas de concreto pré-moldado. Este estudo é importante para se entender e poder quantificar a influência da rigidez deste componente no comportamento de ligações semirrígidas de estruturas de concreto pré-moldado. O objetivo do trabalho é estudar o mecanismo do chumbador no concreto com fibras de aço em ensaios específicos e avaliar também o comportamento de uma ligação viga-pilar de concreto pré-moldado utilizando estas fibras no consolo e no dente da viga. Nesta pesquisa foi realizado um programa experimental no Laboratório de Estruturas da EESC, uma análise numérica com o emprego do software DIANA® e uma comparação com formulações analíticas existentes para o cálculo da força última destes componentes. Foram ensaiados nove modelos experimentais para avaliar especificamente o mecanismo resistente do chumbador, variando-se os diâmetros das barras, sua inclinação e a porcentagem de fibras de aço no concreto. Além destes modelos, foi realizado ensaio de uma ligação viga-pilar de concreto pré-moldado para avaliar a rigidez da ligação com chumbador inserido em concreto com fibras de aço. Nos ensaios experimentais dos chumbadores observou-se que modelos com concreto com fibras de aço apresentam rigidez até 25% maior se comparado ao modelo com concreto convencional. Verificou-se que o graute utilizado para solidarizar os chumbadores exerce significativa influência na capacidade última do modelo, podendo diminuir em cerca de 30% a capacidade de carga. A ligação viga-pilar de concreto pré-moldado utilizando concreto com fibras de aço no consolo e no dente da viga se comportou de maneira satisfatória, não apresentando fissuração na interface dos diferentes concretos. Na comparação dos modelos ensaiados com as formulações teóricas extraídas de trabalhos de referência verificou-se que, para os modelos específicos de chumbador, a formulação existente é representativa. Para a ligação viga-pilar, alguns ajustes na formulação analítica se fizeram necessários para considerações de efeitos de grupo e de borda observados e decorrentes da utilização de dois chumbadores na ligação proposta neste trabalho.
This research deals with the study of the behavior of grouted dowels embedded in concrete with steel fibers. This study is important to understand and quantify the stiffness transmitted by this component in a semi-rigid connection of precast concrete structures. The objective is to study the mechanism of the dowel in the concrete with steel fibers and evaluate the mechanical behavior of a precast beam-column connection using this type of concrete on the corbels and in the dapped-end beam. In this research, an experimental program in the EESC Structures Laboratory was carried out, as well as a numerical analysis with the use of DIANA® software and a comparison with existing formulations to calculate these components. Nine models were experimentally tested to specifically evaluate the dowel resistant mechanism by varying the diameters of the bars, the declination and the percentage of steel fibers in concrete. Furthermore, an experimental test was performed in order to evaluate the behavior of the connector. The results indicate that for the dowels with concrete and steel fibers, the ultimate capacity of the connection occurs by failure of the connector (excessive deformation of the bars), while in conventional concrete this capability is associated with the rupture of the concrete and that the concrete with steel fibers decreases by 25% the deformability of the models. The grout has a significant impact on the ultimate capacity of the model, which may increase in less than 30%. In the analysis of the beam-column connection, it is possible to observe that the proposed connection exceeds by more than 20% the ultimate capacity compared to traditional beam-column connections. In comparing the theoretical models tested with the formulations shown by previous studies, it was found that for specific models dowels, the existing formulation is representative. For the beam-column connection, adjustment was performed in the previous formulation considerations group and edge effects that occur due to the use of two dowels on the tested connection.

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Al-Soudani, Maha. "Diagnosis of reinforced concrete structures in civil engineering by GPR technology : development of alternate methods for precise geometric recognition." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30090.

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Анотація:

La méconnaissance de la géométrie réelle d'une structure mène à une évaluation incorrecte de son état. Par conséquent, une estimation imprécise de sa capacité portante, sa durabilité, sa stabilité et la nécessité de mettre en place une réparation ou un renforcement. En outre, l'optimisation du temps requis pour le processus de réparation a besoin de bien connaître les différentes parties de la structure à évaluer et également pour éviter les zones critiques telles que les aciers, les câbles, etc., lors de la réparation. Par conséquent, il est nécessaire d'utiliser des techniques d'évaluation non destructive (END) afin de connaître la géométrie réelle de la structure, notamment l'emplacement des armatures dans les structures en béton armé. Le GPR est considéré comme une technique non-destructive idéale pour détecter et localiser les renforts. Cependant, sa précision de localisation est limitée. Le but de ce projet de recherche a donc été d'accroître la précision du GPR en matière de reconnaissance géométrique interne de structures en béton armé. L'objectif principal de cette étude est de localiser précisément le positionnement des armatures dans le plan ausculté ainsi qu'en profondeur. Pour atteindre cet objectif, une nouvelle méthodologie de mesures et du traitement des signaux GPR a été proposée dans cette étude. Plusieurs configurations d'acquisition de données en utilisant des signaux simulés sont testées pour proposer et développer un algorithme d'imagerie du milieu de propagation afin de définir sa géométrie interne et de localiser précisément les barres de renforcement. Des traitements supplémentaires sont appliqués pour améliorer la précision de la détection et pour identifier les différentes interfaces dans le milieu testé. L'algorithme et le traitement sont appliqués aux signaux simulés. Des validations expérimentales ont ensuite été appliquées aux signaux réels acquis sur différentes dalles en béton armé. L'objectif est de tester la capacité de l'algorithme d'imagerie proposé pour localiser différents objets enfouis. Les résultats encourageants montrent que cet algorithme est capable d'estimer la position de différents objets enfouis et pas uniquement les armatures avec une erreur d'estimation de (0-1) mm. Les performances de l'algorithme ont été comparées à celles d'une méthode de migration et aux résultats de mesure obtenus avec un pachomètre. Ces comparaisons ont systématiquement révélé une meilleure précision de la localisation avec l'algorithme développé.Une autre étude a été proposée dans ce travail en testant l'algorithme avec des signaux réels modifiés. Ces signaux sont produits en réduisant le gain le moins possible. La conclusion la plus évidente de cette étude est que l'algorithme proposé est capable de localiser les différents objets même si les signaux réfléchis par eux sont de faible amplitude
Lack of acquaintance in the real geometry of a structure leads to incorrect evaluation of its state. Consequently, this will lead to inaccurate estimation of bearing capacity, durability, stability and moreover, the need for repair or strengthening. Furthermore, optimization of the required time for repair process needs to well recognize the parts of structure to be assessed and also to avoid the critical zones such as reinforcing bars, cables, etc., during repairing. Therefore; it becomes necessary to use a non-destructive testing (NDT) method in order to know the real geometry of structure in particular, the location of reinforcements in reinforced concrete structures. GPR is considered as an ideal non-invasive technique in detecting and locating these reinforcements. However, its accuracy in localization is limited. The aim of this research project has therefore been to increase the accuracy of GPR in recognizing the internal geometry of reinforced concrete structures. The main objective of this study is to locate accurately the position of reinforcements into three dimensions. To achieve this purpose, a new methodology for GPR measurement and processing is proposed in this study.Several configurations of data acquisition using simulated signals are tested to propose and develop an appropriate imaging algorithm for the propagation medium to imagine its internal geometry and to locate accurately the reinforcing bars. Further processing are applied to improve the accuracy of detection and to identify the different interfaces in the tested medium. Both algorithm and processing are applied on simulated signals. Subsequent experimental validations have been applied using real signals acquired from different real reinforced concrete slabs. The goal is to test the ability of proposed imaging algorithm for the localization of different targets. The encouraging results indicate that this algorithm is able to estimate the position of different buried targets and not only the reinforcing bars with an estimation error of (0-1)mm.The performance of proposed algorithm has compared to those of migration method and to the results obtained from pachometer. These comparisons have systematically revealed a better localization accuracy using the developed algorithm.Another study has been proposed in this work by testing the algorithm using modified real signals. These signals are produced by reducing the gain as less as possible. The most obvious finding to emerge from this study is that the proposed algorithm is able to localize the different goals even if the signals reflected by them are of low amplitude

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Книги з теми "Precast reinforced concrete structures"

Institute, American Concrete. Specifications for structural concrete, ACI 301-05, with selected ACI references: Field reference manual. Farmington Hills: American Concrete Institute, 2005.

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American Society of Civil Engineers., ed. Standard practice for direct design of buried precast concrete box sections. Reston, VA: American Society of Civil Engineers, 2000.

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Rodriguez, M. Earthquake resistant precast concrete buildings: Floor accelerations in buildings. Christchurch, N.Z: Dept. of Civil Engineering, University of Canterbury, 2000.

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American Society of Civil Engineers., ed. Standard practice for direct design of precast concrete box sections for jacking in trenchless construction. Reston, Va: American Society of Civil Engineers, 2001.

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Leonovich, Sergey, Nikolay Chernoivan, Viktor Tur, and Dmitriy Litvinovskiy. Technology of reconstruction of buildings and structures. ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1867636.

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The monograph provides the basics of technology for the production of general construction and finishing works performed during the reconstruction of existing industrial and civil facilities: strengthening and restoration of exploited structures, as well as the construction of new buildings and structures designed at the reconstructed facility. The issues of conducting field surveys of operated buildings and structures in order to prepare a conclusion on the technical condition of load-bearing and enclosing structures are considered. The main design solutions and technology of work during the reconstruction (repair, reinforcement) of load-bearing and enclosing structures of operated facilities made of the following materials are given: monolithic and precast reinforced concrete; metal structures; brickwork; elements of wooden structures. The technology of rehabilitation (repair) of finishing coatings is given: monolithic plaster, wall and floor cladding with ceramic tiles and synthetic coatings, as well as repair of surfaces lined with slabs made of natural materials (granite, marble). The effective technology of construction of building structures of shallow foundations, double-layer insulated brick walls, buildings with a monolithic reinforced concrete supporting frame; the device of a waterproof carpet made of PVC membranes, etc. are described. For civil engineers. It can be useful for students, postgraduates and teachers of technical universities.

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Elliott, Kim, ed. Precast Concrete Structures. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315370705.

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Steinle, Alfred, Hubert Bachmann, and Mathias Tillmann, eds. Precast Concrete Structures. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783433609064.

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Bachmann, Hubert, and Alfred Steinle. Precast Concrete Structures. Berlin, Germany: Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, 2012. http://dx.doi.org/10.1002/9783433600962.

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Design of precast concrete structures. Chichester, West Sussex, England: E. Horwood, 1988.

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Multi-storey precast concrete framed structures. Oxford [England]: Blackwell Science, 1996.

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Частини книг з теми "Precast reinforced concrete structures"

Kasapoglu, B., H. Sezen, and K. White. "Exterior protection of precast reinforced concrete culvert structures." In Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 1353–60. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003322641-164.

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Makoond, N., M. Buitrago, and J. M. Adam. "Computational study on the progressive collapse of precast reinforced concrete structures." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 533–38. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-87.

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Makoond, N., M. Buitrago, and J. M. Adam. "Computational study on the progressive collapse of precast reinforced concrete structures." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 187–88. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-87.

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Ibrahim, Basil, Salaheldin Mousa, Hamdy M. Mohamed, and Brahim Benmokrane. "GFRP Reinforced Precast Concrete Tunnel Lining Segments Under Flexural Cyclic Loading." In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 149–56. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09409-5_17.

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Witzany, J., R. Zigler, and A. Polák. "Precast reinforced concrete demountable system of multi-storey buildings." In Insights and Innovations in Structural Engineering, Mechanics and Computation, 1300–1304. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-213.

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Losaria, P. E. Joseph, P. E. Steven Nolan, P. E. Andra Diggs, and Dave Hartman. "Case Study on CFRP Prestressed Concrete Soldier-Pile Walls with GFRP-Reinforced Precast Concrete Panels." In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 81–89. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09632-7_10.

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Almusallam, T., Y. Al-Salloum, H. Elsanadedy, R. Iqbal, H. Abbas, and N. Siddiqui. "Risk assessment of precast reinforced concrete buildings against blast loads: Case study." In Insights and Innovations in Structural Engineering, Mechanics and Computation, 972–75. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-160.

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Hosseini, S. M., S. Mousa, H. M. Mohamed, and B. Benmokrane. "Development and testing of new precast concrete tunnel segments reinforced with GFRP bars and ties." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 1453–58. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-237.

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Hosseini, S. M., S. Mousa, H. M. Mohamed, and B. Benmokrane. "Development and testing of new precast concrete tunnel segments reinforced with GFRP bars and ties." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 505–6. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-237.

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Elliott, Kim S. "Precast concrete floors." In Precast Concrete Structures, 125–214. 2nd ed. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9780367814885-4.

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Тези доповідей конференцій з теми "Precast reinforced concrete structures"

Peng, Brian H. H., Richard Fenwick, Rajesh Dhakal, and Athol Carr. "Seismic Performance of Reinforced Concrete Frames with Precast-Prestressed Flooring System." In Structures Congress 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41031(341)312.

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"Lightweight Concrete Bridge Deck Precast Panels Reinforced with GFRP Bars." In SP-275: Fiber-Reinforced Polymer Reinforcement for Concrete Structures 10th International Symposium. American Concrete Institute, 2011. http://dx.doi.org/10.14359/51682439.

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"Shear Load Testing of Carbon Fiber Reinforced Polymer Strengthened Double Tee Beams in Precast Parking Garage." In SP-188: 4th Intl Symposium - Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures. American Concrete Institute, 1999. http://dx.doi.org/10.14359/5696.

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Xue, Yicong, Yong Yang, Yunlong Yu, and Ruyue Liu. "Experimental study on mechanical performance of partially precast steel reinforced concrete beams." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6942.

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In order to exploit the potentials in mechanical and constructional performance of steel reinforced concrete structures and prefabricated structures, three innovative kinds of partially precast steel reinforced concrete beams, which are abbreviated here as PPSRC, HPSRC and PPCSRC beam, are presented in this paper. The PPSRC beam is composed of two parts, which are the precast outer shell with high-performance concrete and the cast-in-place inner part with common-strength concrete. Meanwhile, on the basis of PPSRC beam, the PPCSRC beam applies castellated steel shape and the HPSRC beam keeps the beam core hollow. With the aim to investigate the mechanical behavior, failure mode and bearing capacity of the PPSRC, PPCSRC and HPSRC beams, a static loading experiment with twenty four specimens was carried out. The effects of aspect ratio, construction method, section shape, concrete flange and strength of concrete were critically examined. Test results indicate that the HPSRC, PPCSRC and PPSRC beams both exhibit similar mechanical performance and bonding performance. The flexural capacity and shear capacity are seldom affected by the construction method and section shape, and increase with the increasing of the cast-in-place concrete strength. The shear strength of the specimens is significantly affected by the concrete flange and aspect ratio.

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"Cyclic Shear Behavior of Connection between Precast Beam and Deck with Steel Fiber-Reinforced Concrete." In SP-229: Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. American Concrete Institute, 2005. http://dx.doi.org/10.14359/14748.

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Mirza, Olivia, Andrew Talos, Matthew Hennessy, and Brendan Kirkland. "Behaviour and Design of Composite Steel and Precast Concrete Transom for Railway Bridges Application." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6993.

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Currently most railway bridges in Australia require the replacement of the timber transoms that reside in the railway system. Composite steel and precast reinforced concrete transoms have been proposed as the replacement for the current timber counterparts. This paper outlines the structural benefits of composite steel-concrete transoms for ballastless tracks when retrofitted to existing railway steel bridges. However, in existing studies, it is found that there is little investigation into the effect of derailment loading on reinforced concrete transoms. Therefore, this paper provides an investigation of derailment impact loading on precast reinforced concrete transoms. The paper herein investigates the derailment impact loading of a train through experimental testing and numerical analysis of conventional reinforced concrete transoms. The paper also evaluates the potential use of 3 different shear connectors; welded shear studs, Lindapter bolts and Ajax bolts. The results of the experimental tests and finite element models are used to determine whether each transom is a viable option for the replacement of the current timber transoms on the existing bridges in Australia and whether they provide a stronger and longer lasting solution to the current transom problem.

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Takagi, J., S. Minami, and K. Kitayama. "Performance Evaluation of Shear Walls in Existing Wall-Type Precast Reinforced Concrete Residential Buildings with New Openings." In Structures Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41171(401)242.

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Proksch-Weilguni, Clemens, and Johann Kollegger. "Resource efficient reinforcement concept for precast tunnel segments." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1352.

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The global increase in world population and the growing demand of mobility leads to new huge infrastructure projects all over the world. Due to the circumstance, that every infrastructure project is unique and dependent on local conditions the optimization of single structural elements is not that common in the field of reinforced concrete structures. When it comes to building tunnel structures using a tunnel boring machine (TBM), a lot of almost identical tunnel segments called tubbings are needed. Already a reduction of a few centimeters of the tunnel segment thickness, leads to a significant saving of concrete when it comes to tunnel structures with a length of a few kilometers. The thickness of the tunnel segments mostly depends on the design of the radial joints of the individual tunnel segments. That is why the Institute of Structural Engineering of the TU Wien developed a new reinforcement concept for tunnel segments which increases the load bearing capacity of the radial joints significantly. With a patent application submitted, tunnel segments with the new reinforcement concept were manufactured, tested and it was shown that the TU Wien proposal significantly improves the load bearing capacity of tunnel segments.Due to a presented design approach for determining the load bearing capacity of the segments and a first simplified quantification of the resource saving potential it can be said that the newly developed joint design is a great possibility for constructing tunnels with thinner tunnel segments.

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Ortlepp, R., S. Ortlepp, and C. Beyer. "RC Roof Structures from Post-war Time." In IABSE Symposium, Wroclaw 2020: Synergy of Culture and Civil Engineering – History and Challenges. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2020. http://dx.doi.org/10.2749/wroclaw.2020.0601.

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Reinforced concrete roof structures represent a historical construction method that was particularly widespread in Central and Eastern Germany in the post-war period. The lack of wood at that time mainly led to the invention of constructions based on typical wooden roof constructions. Particularly in the first two post-war decades, precast concrete companies developed various system solutions for reinforced concrete roofs with different span widths. Initially only implemented in a slightly technical form, it was later possible to systematise such roof structures more strongly and to convert them to extensive prefabrication. Due to the high planning and assembly costs, however, the construction method was not successful in the long run. The results of the analysis in this article show that the RC structures, which are over 50 years old, show comparatively little damage. Due to their rarity, which is quite rare in the meantime, it is worth considering the preservation of this construction as a historical testimony.

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Brühwiler, Eugen. "UHPFRC is ready to revolutionize existing and new structures." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0067.

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“Structural UHPFRC” stands for Ultra‐High‐Performance Fibre Reinforced Cementitious Composite material which is complemented by reinforcing and prestressing steel to enhance the resistance and durability of structural elements. Properties of impermeable, tensile strain hardening UHPFRC are discussed in view of structural applications. Two fundamental concepts to enhance concrete bridges have been developed by research and validated by numerous applications, mostly in Switzerland:1) Rehabilitation and strengthening of existing concrete structures by adding a layer of structural UHPFRC, and 2) Construction of new structures in Structural UHPFRC, often composed of precast elements. These applications show that “Structural UHPFRC” has made its proof as a novel building material and technology to enhance bridges and structures in general. UHPFRC also contributes in lowering the environmental impact of structures and thus improving sustainability. UHPFRC is at the beginning of a new construction era: the “post‐concrete era”.

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Звіти організацій з теми "Precast reinforced concrete structures"

Ebeling, Robert, та Barry White. Load and resistance factors for earth retaining, reinforced concrete hydraulic structures based on a reliability index (β) derived from the Probability of Unsatisfactory Performance (PUP) : phase 2 study. Engineer Research and Development Center (U.S.), березень 2021. http://dx.doi.org/10.21079/11681/39881.

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This technical report documents the second of a two-phase research and development (R&D) study in support of the development of a combined Load and Resistance Factor Design (LRFD) methodology that accommodates geotechnical as well as structural design limit states for design of the U.S. Army Corps of Engineers (USACE) reinforced concrete, hydraulic navigation structures. To this end, this R&D effort extends reliability procedures that have been developed for other non-USACE structural systems to encompass USACE hydraulic structures. Many of these reinforced concrete, hydraulic structures are founded on and/or retain earth or are buttressed by an earthen feature. Consequently, the design of many of these hydraulic structures involves significant soil structure interaction. Development of the required reliability and corresponding LRFD procedures has been lagging in the geotechnical topic area as compared to those for structural limit state considerations and have therefore been the focus of this second-phase R&D effort. Design of an example T-Wall hydraulic structure involves consideration of five geotechnical and structural limit states. New numerical procedures have been developed for precise multiple limit state reliability calculations and for complete LRFD analysis of this example T-Wall reinforced concrete, hydraulic structure.

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Nema, Arpit, and Jose Restrep. Low Seismic Damage Columns for Accelerated Bridge Construction. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, December 2020. http://dx.doi.org/10.55461/zisp3722.

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This report describes the design, construction, and shaking table response and computation simulation of a Low Seismic-Damage Bridge Bent built using Accelerated Bridge Construction methods. The proposed bent combines precast post-tensioned columns with precast foundation and bent cap to simplify off- and on-site construction burdens and minimize earthquake-induced damage and associated repair costs. Each column consists of reinforced concrete cast inside a cylindrical steel shell, which acts as the formwork, and the confining and shear reinforcement. The column steel shell is engineered to facilitate the formation of a rocking interface for concentrating the deformation demands in the columns, thereby reducing earthquake-induced damage. The precast foundation and bent cap have corrugated-metal-duct lined sockets, where the columns will be placed and grouted on-site to form the column–beam joints. Large inelastic deformation demands in the structure are concentrated at the column–beam interfaces, which are designed to accommodate these demands with minimal structural damage. Longitudinal post-tensioned high-strength steel threaded bars, designed to respond elastically, ensure re-centering behavior. Internal mild steel reinforcing bars, debonded from the concrete at the interfaces, provide energy dissipation and impact mitigation.

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D’Arcy, Thomas J., Walter I. Korkosz, and Larbi Sennour. Durability of Precast Prestressed Concrete Structures. Precast/Prestressed Concrete Institute, 1995. http://dx.doi.org/10.15554/pci.rr.mat-007.

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Carino, Nicholas J., and James R. Clifton. Prediction of cracking in reinforced concrete structures. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5634.

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Aragon, Theresa Clare. Type III Grouted Ductile Reinforcing Bar Connections for Precast Concrete Structures. Precast/Prestressed Concrete Institute, 2018. http://dx.doi.org/10.15554/pci.rr.seis-001.

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Naus, D. J., C. B. Oland, and B. R. Ellingwood. Report on aging of nuclear power plant reinforced concrete structures. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/219361.

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Woodson, Stanley C., and William A. Price. Improved Strength Design of Reinforced Concrete Hydraulic Structures - Research Support. Fort Belvoir, VA: Defense Technical Information Center, April 1992. http://dx.doi.org/10.21236/ada251470.

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Morgan, Brian G., and Yahya C. Kurama. "Friction-Damped Unbonded Post-Tensioned Precast Concrete Moment Frame Structures for Seismic Regions". Precast/Prestressed Concrete Institute, 2007. http://dx.doi.org/10.15554/pci.rr.seis-005.

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Ballarini, Roberto, Bora Gencturk, Amit Jain, Hadi Aryan, Yunping Xi, Mohamed Abdelrahman, and Benjamin W. Spencer. Multiple Degradation Mechanisms in Reinforced Concrete Structures, Modeling and Risk Analysis. Office of Scientific and Technical Information (OSTI), February 2020. http://dx.doi.org/10.2172/1599377.

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Spencer, Benjamin W., William M. Hoffman, Daniel Schwen, and Sudipta Biswas. Progress on Grizzly Development for Reactor Pressure Vessels and Reinforced Concrete Structures. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1572397.

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