Artykuły w czasopismach: „Reinforced concrete structures”

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Murty, C. V. R., Rakesh K. Goel, Alok Goyal, Sudhir K. Jain, Ravi Sinha, Durgesh C. Rai, Jaswant N. Arlekar i Rainer Metzger. "Reinforced Concrete Structures". Earthquake Spectra 18, nr 1_suppl (lipiec 2002): 149–85. http://dx.doi.org/10.1193/1.2803911.

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Frolov, Kirill E. "Experimental studies of reinforced concrete structures of hydraulic structures strengthened with composite materials". Structural Mechanics of Engineering Constructions and Buildings 15, nr 3 (15.12.2019): 237–42. http://dx.doi.org/10.22363/1815-5235-2019-15-3-237-242.

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Relevance. During the operation process (first of all, long-term operation) of hydraulic structures, it becomes necessary to strengthen their reinforced concrete structures. In recent years, reinforcement of reinforced concrete structures has been used in industrial and civil construction by external reinforcement systems made of composite materials (for example, carbon materials). In this case, in hydraulic engineering construction there are only isolated examples of such amplification. Aims of research. Experimental studies of reinforced concrete structures of hydraulic structures strengthened with external reinforcement from carbon materials presented in the article were carried out in order to substantiate the use of external reinforcement based on carbon materials (tapes and lamellae) to reinforce reinforced concrete structures of hydraulic structures. Methods. In order to carry out an experimental study of the strengthening of hydraulic structures with external reinforcement, reinforced concrete models of hydraulic structures of a beam type were made of carbon materials. At the same time, reinforced concrete structures with characteristic features of hydraulic structures, such as low concrete classes and reinforcement percentages (less than 1%), were adopted for modeling. Reinforced concrete models were strengthened with carbon ribbons and lamellae. Experimental studies were carried out under the action of a bending moment using standard methods. The increase in the strength of reinforced concrete structures due to their reinforcement with carbon ribbons and lamellae was determined. Results. The results of experimental studies of the strength of reinforced concrete structures of hydraulic structures without reinforcement and reinforced with carbon ribbons and lamellae under the action of a bending moment are presented. On the basis of the comparison carried out, the increase in the strength of reinforced concrete structures is determined by their reinforcement with carbon ribbons and lamellae.

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Jagtap, Siddhant Millind, Shailesh Kalidas Rathod, Rohit Umesh Jadhav, Prathamesh Nitin Patil, Atharva Shashikant Patil, Ashwini M. Kadam i P. G. Chavan. "Fibre Mesh in Reinforced Slabs". International Journal for Research in Applied Science and Engineering Technology 10, nr 5 (31.05.2022): 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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Vu, Dinh Tho, i Tuan Anh Pham. "A method for calculating flexural multi-layer reinforced concrete structures". Vietnam Institute for Building Science and Technology 2023, vi.vol2 (czerwiec 2023): 22–33. http://dx.doi.org/10.59382/j-ibst.2023.vi.vol2-3.

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In construction practice, reinforced concrete structures are designed to meet the requirements of not only the load-bearing capacity but also the abilities of sound insulation, heat insulation, fire resistance, etc. A promising and effective solution to meet these requirements is using multi-layer reinforced concrete structures with an internal layer by low thermal conductivity concrete, and external layers by traditional concrete, high-strength concrete, or kezamzit concrete. The different physical-mechanical properties of the material layers affect the structure's performance under load. In this study, the authors have introduced a theoretical method to calculate and analyze the stress-strain states of flexural reinforced concrete structures with cross-sectional sections consisting of layers from different concrete materials under the effect of load. The study's results have shown that in the manufacturing process of multi-layer reinforced concrete structures by different concretes, a contact zone is formed between layers because of aggregate components from different types of concrete. Calculated results by using the proposed model have shown that the values of the moment and deflection of the beam when cracks begin to appear and when the beam is damaged, are closer to the experimental results than by using the previous models. The research results are useful references for the calculation of multi-layer reinforced concrete structures with a middle layer from lightweight concrete.

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Bertagnoli, Gabriele, Luca Giordano, Dario La Mazza i Giuseppe Mancini. "Reinforced Concrete Frame Structures". Procedia Engineering 161 (2016): 1013–17. http://dx.doi.org/10.1016/j.proeng.2016.08.841.

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P. Tamayo, Jorge L., Armando M. Awruch i Inácio B. Morsch. "DYNAMIC ANALYSIS OF REINFORCED CONCRETE STRUCTURES". Revista Cientifica TECNIA 22, nr 1 (4.04.2017): 33. http://dx.doi.org/10.21754/tecnia.v22i1.88.

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ABSTRACTThe objective of this work is to provide a reliable numerical model using the finite element method (FEM) for the dynamic analysis of reinforced concrete (RC) structures. For this purpose, a computer program based on a strain-rate sensitive elasto-plastic theory is developed using 3D brick finite elements. The implicit Newmark scheme with predictor and corrector phases is used for time integration of the nonlinear system of equations. In addition, the steel reinforcement is considered to be smeared and perfectly adhered to concrete and represented by membrane finite elements. Two benchmark examples are analyzed with the present numerical model and results are compared with those obtained by other authors. The present numerical model is able to reproduce the path failure, collapse loads and failure mechanism within an acceptable level of accuracy. Keywords.-Reinforced concrete (RC) structures, Finite element method (FEM). RESUMENEl objetivo de este trabajo es presentar un modelo numérico confiable usando el método de los elementos finitos (MEF) para el análisis dinámico de estructuras de concreto reforzado. Con este propósito, un programa de cómputo basado en la teoría de elasto-plasticidad con sensibilidad a la velocidad de deformación es desarrollado usando elementos finitos tridimensionales. El procedimiento de Newmark es adoptado para la integración en el tiempo del sistema no linear de ecuaciones. Además, se supone que el acero de refuerzo está perfectamente distribuido e adherido al concreto, siendo representado por elementos finitos de membrana. Dos ejemplos son solucionados con el presente modelo numérico y los resultados obtenidos son comparados con los resultados de otros autores. Para todos los casos, la trayectoria de falla, la carga de colapso y el mecanismo de falla son reproducidos con suficiente precisión. Palabras clave.- Estructuras de concreto reforzado, Método de los elementos finitos (MEF).

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Travush, Vladimir, i Vasily Murashkin. "CONCRETE DEFORMATION MODEL FOR RECONSTRUCTED REINFORCED CONCRETE". International Journal for Computational Civil and Structural Engineering 18, nr 4 (28.12.2022): 132–37. http://dx.doi.org/10.22337/2587-9618-2022-18-4-132-137.

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During the reconstruction, or upon expiration of the service life, as well as after external impact, reinforced concrete structures require examination and verification calculations. Existing diagrams of concrete deformation are focused on designing new structures and are not adapted to the concretes of the reconstructed structures. Using the world experience in describing alloy deformation, the concrete deformation model based on using the Arrhenius equation is proposed in this article. A technique for creating an individual deformations model during the reconstruction is demonstrated on a specific example. The physical meaning of the coefficients used in the proposed model is illustrated. Examples confirming the adequacy of the proposed concrete deformations model during the reconstruction are given.

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Aljasmi, Salah, Nur Farhayu Ariffin i Mazlan Abu Seman. "The Research of Blast Resistant of Reinforcement Concrete Beams in Concrete Structures at Off-site Oil and Gas Plant". CONSTRUCTION 1, nr 2 (9.11.2021): 85–92. http://dx.doi.org/10.15282/construction.v1i2.6907.

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In the recent decades, blasts and gas explosions at the off-site of oil and gas plants have increased leading to destruction of important concrete structures, essential equipment and loss of human life. In response, structural engineers have come up with different ways of reinforcing beams of concrete structures using fiber reinforced polymers composite materials to produce blast resistant structures to minimize the impact of the blast loads, due to their unique and individual characteristics like high flexural and shear strength. This paper seeks to research the dynamic behavior, response and performance of reinforce concrete beams strengthened with Carbon Fiber Reinforced Polymer composites when subjected to blast loading. The study aims at proposing a design model of strengthening reinforce concrete beams with Carbon Fiber Reinforced Polymer in supporting concrete structures at off-site oil and gas plants against hydrocarbon explosions. Carbon Fiber Reinforced Polymer composites exhibit higher modulus of elasticity, higher energy absorption capacity, resistant to all forms of alkali and higher tensile strength compared to all other fiber reinforced polymers reinforcements and therefore the need to assess its capacity in protecting concrete structures at oil and gas plants against dynamic loads. The research will be carried out through numerical analysis using the finite element analysis computer program, ANSYS.

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Shahraki, Hossein. "The seismic performance reliability of reinforced concrete moment structures". Tehnicki vjesnik - Technical Gazette 22, nr 1 (2015): 151–60. http://dx.doi.org/10.17559/tv-20140330122450.

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Khezhev, T. A., G. N. Khadzhishalapov, F. M. Shogenova, A. Kh Artabaev i M. Kh Mashukova. "Properties of fire-retardant vermiculite-concrete composite and fine-grained concrete for two-layer reinforced cement structures". Herald of Dagestan State Technical University. Technical Sciences 49, nr 2 (17.08.2022): 165–76. http://dx.doi.org/10.21822/2073-6185-2022-49-2-165-176.

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Objective. Development of compositions of fire-retardant vermiculite-concrete composites for reinforced cement structures. Investigation of the properties of fire-retardant vermiculite-concrete composite and fine-grained concrete for two-layer reinforced cement structures.Method. Methods for increasing the fire resistance of reinforced concrete structures are considered. Research is focused on the development of fire-retardant composites using expanded vermiculite and volcanic ash. To improve the physical and mechanical properties of the fire-retardant composite, a mixture of Portland cement, gypsum, lime, basalt fiber, saponified wood resin, volcanic ash and expanded vermiculite has been developed. For the study of vermiculite concretes reinforced with basalt fiber, a second-order rotatable plan of the regular hexagon type was used.Result. Fiber-vermiculite concretes are proposed, which have improved fire-retardant properties compared to known compositions. This is due to the better preservation of the fiber-vermiculite-concrete layer when heated as a result of fiber reinforcement. Also, thanks to the addition of SDO, the fire-retardant properties of the composite increase due to the additional porosity of the fiber-vermiculite-concrete. The parameters of the "stress-strain" diagram of a vermiculite-concrete composite and fine-grained concrete have been obtained.Conclusion. Vermiculite concretes with an average density of 480-560 kg/m3 have the best fire-retardant properties. The developed two-layer reinforced cement structures have high fire resistance.

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Wolf, Benjamin, Andrea Kustermann, Christian Schuler, Christoph Dauberschmidt i Ömer Bucak. "Basalt reinforced concrete structures for retrofitting concrete surfaces". MATEC Web of Conferences 199 (2018): 09014. http://dx.doi.org/10.1051/matecconf/201819909014.

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Reinforced concrete facades exist since decades exposed to natural weather conditions. Thus nowadays lot of them are damaged by carbonation induced corrosion and therefor require repairing and retrofitting. The aim of this research project is to investigate the possibilities of basalt fibre reinforced concrete as repairing material and also basalt rebars as additional strengthening reinforcement. Investigations with basalt fibre reinforced mortar prisms showed best results in 3 point bending tests, tensile strength and also compressive strength using 0.3 Vol.-% basalt fibres in mixture. The mechanical properties of basalt rebars made of basalt fibre reinforced polymer were tested, showing higher values in tensile strength and Young´s Modulus than comparable steel reinforcement samples. The basalt rebar reinforced concrete samples achieved higher ultimate loads in three-point bending test compared to SRC samples. But after failure in the bonding area no residual load capacity remained. Finally basalt reinforcement bars seems to be well suited for use as retrofitting material for facade elements, but numerous properties have to be examined in further investigations.

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Orlowsky, Jeanette, Markus Beßling i Vitalii Kryzhanovskyi. "Prospects for the Use of Textile-Reinforced Concrete in Buildings and Structures Maintenance". Buildings 13, nr 1 (10.01.2023): 189. http://dx.doi.org/10.3390/buildings13010189.

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This paper discusses the state of the art in research on the use of textile-reinforced concretes in structural maintenance. Textile-reinforced concretes can be used in structural maintenance for various purposes, including the sealing and protection of the existing building structures, as well as for the strengthening of structures. The first-mentioned aspects are explained in this paper on the basis of example applications. A special focus is placed on the maintenance of heritage-protected structures. The development, characterization, and testing of a textile-reinforced concrete system for a heritage-protected structure are presented. Examples of the application of textile-reinforced concrete for strengthening highway pavements and masonry are also given. In particular, the possibility of adapting the textile-reinforced concrete repair material to the needs of the individual building is one advantage of this composite material.

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Schiessl, Peter. "Durability of reinforced concrete structures". Construction and Building Materials 10, nr 5 (lipiec 1996): 289–92. http://dx.doi.org/10.1016/0950-0618(95)00072-0.

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Melchers, Robert E. "Long-Term Durability of Marine Reinforced Concrete Structures". Journal of Marine Science and Engineering 8, nr 4 (18.04.2020): 290. http://dx.doi.org/10.3390/jmse8040290.

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The sustainability of reinforced concrete is critical, particularly for structures exposed to marine environments. Chlorides are implicated in causing or accelerating reinforcement corrosion and potentially earlier expensive repairs, yet there are many older reinforced concrete structures in good condition for many decades despite very high chloride levels at the reinforcement. The reasons for this are reviewed briefly, together with recent experimental work that better defines the role of chlorides. One is initiation of reinforcement corrosion but only through localized pitting at air-voids in concrete at the interface with the steel reinforcement. These tend to be small or negligible for high quality well-compacted concretes. The other role for chlorides has been shown, in experimental work, to accelerate the long-term loss of concrete alkali material. On the other hand, a review of practical experience shows that what has been termed chloride-induced reinforcement corrosion often is not that at all, but is the end-product of factors that impair the protective nature of the concrete. As reviewed herein, these include poor compaction, physical damage to concrete cover, concrete shrinkage, and alkali-aggregate reactions. The various observations presented are important for the proper understanding, analysis, and design of durable reinforced concrete structures exposed to chloride-rich environments.

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Luchko, J., B. Nazarevich i V. Коvalchuk. "DEGRADATING CONCRETE AND REINFORCED CONCRETE BUILDING STRUCTURES AND LONG-TERM STRUCTURES". Bulletin of Odessa State Academy of Civil Engineering and Architecture, nr 86 (31.03.2022): 35–46. http://dx.doi.org/10.31650/2415-377x-2022-86-35-46.

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The problems of degradation of concrete and reinforced concrete constructions of buildings and constructions of long operation are formulated on the basis of the performed field researches and its urgency is noted in the work. The authors analyzed a number of works on this problem. In particular, the results of technical diagnostics of many buildings and structures, both newly built and long-term operation, are described. The necessity of periodic technical diagnostics is noted. Based on these studies, the main factors that significantly affect the reduction of load-bearing capacity of reinforced concrete structures of buildings and structures are summarized and found that they are as follows: design errors, defects and shortcomings of construction and operational shortcomings of buildings and structures. Also, using modern technologies and materials, the authors identified the benefits of their use for repair and restoration of concrete and reinforced concrete structures at a number of long-term facilities. Relevant conclusions have been formulated on research and repair works. It is established that to prevent loss of load-bearing capacity of structures for long-term operation it is necessary to study the degradation and residual life of load-bearing capacity of structures, their reliability and durability, which were exposed to aggressive air, soil and water. It is established that the reason for the decrease in the strength of concrete beams, which were operated in an aggressive environment, was the error in the design of corrosion protection of structures. Reinforcement and injection filling of dry cracks, crevices and hidden cavities and stratifications and other corrosion damage of beams and slabs with the use of fluid polyurethane compositions, which allowed to extend the service life of structures. It is established that the use of the Polymer Cement Concrete system with the use of glued composite materials ensured the further normal operation of the monolithic reinforced concrete floor of the technical floor of the residential building. Recommendations for the sequence of operations in the repair of reinforced concrete structures of buildings and structures of long-term operation.

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Sanytsky, Myroslav, Тetiana, Kropyvnytska, Orest Shyiko, Yurii Bobetskyi i Andriy Volianiuk. "High strength steel fiber reinforced concrete for fortification protected structures". Theory and Building Practice 2023, nr 1 (20.06.2023): 37–42. http://dx.doi.org/10.23939/jtbp2023.01.037.

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The article presents the results of research on modified steel fiber-reinforced concrete and shows the expediency of their use to increase the effectiveness of fortification protection structures against shock loads. It was established that according to the results of tests of compressive strength (fсm = 79.4 MPa) and tensile strength during bending (fс, lf = 7.4 MPa), steel fiber-reinforced concrete can be classified as high-strength (strength class C 50/60) and rapid-hardening (fcm2/ fcm28 = 0.57) in accordance with DSTU EN 206:2018. Manufacturing in factory conditions of reinforced concrete elements of structures based on high-strength steel fiber-reinforced concrete with increased resistance to various types of force effects during shelling will allow to obtain quick-assembling/quick-dismantling fortification structures that will be able to provide protection for the personnel of the units of the armed forces of Ukraine.

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Purba, Burt K., i Aftab A. Mufti. "Investigation of the behavior of circular concrete columns reinforced with carbon fiber reinforced polymer (CFRP) jackets". Canadian Journal of Civil Engineering 26, nr 5 (1.10.1999): 590–96. http://dx.doi.org/10.1139/l99-022.

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Recent advancements in the fields of fiber reinforced polymers (FRPs) have resulted in the development of new materials with great potential for applications in civil engineering structures, and due to extensive research over recent years, FRPs are now being considered for the design of new structures. This study describes how carbon fiber reinforced polymer jackets can be used to reinforce circular concrete columns. Fibers aligned in the circumferential direction provide axial and shear strength to the concrete, while fibers aligned in the longitudinal direction provide flexural reinforcement. Prefabricated FRP jackets or tubes would also provide the formwork for the columns, resulting in a decrease in labor and materials required for construction. Also, the enhanced behavior of FRP jacketed concrete columns could allow the use of smaller sections than would be required for conventionally reinforced concrete columns. Furthermore, FRP jacket reinforced concrete columns would be more durable than conventionally reinforced concrete columns and therefore would require less maintenance and have longer service life.Key words: bridge, carbon, column, concrete, confinement, fiber reinforced polymer, jacket, retrofitting, seismic, strengthening.

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Elyiğit, Belkıs, i Cevdet Emin Ekinci. "A RESEARCH ON STRUCTURAL AND NON-STRUCTURAL DAMAGES AND DAMAGE ASSESSMENT IN REINFORCED CONCRETE STRUCTURES". NWSA Academic Journals 18, nr 2 (25.04.2023): 19–42. http://dx.doi.org/10.12739/nwsa.2023.18.2.1a0485.

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Popovych, M. M., i S. V. Kliuchnyk. "Features of the Stressed-Strain State of a Steel-Reinforced-Concrete Span Structure with Preliminary Bending of a Steel Beam". Science and Transport Progress, nr 1(97) (17.10.2022): 80–87. http://dx.doi.org/10.15802/stp2022/265333.

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Purpose. The authors aim to determine the features of the operation of a steel-reinforced concrete span structure with beams reinforced with an I-beam, with their pre-stressing using the bending of a steel I-beam. Methodology. To manufacture a steel-reinforced concrete span structure, it was proposed to reinforce an I-beam with a camber, which is then leveled with the help of applied external loads. For practical convenience, the vertical external forces are replaced by horizontal forces that keep the metal I-beam in a deformed state and in this state it is concreted. After the concrete strength development, the external forces are removed and the metal I-beam creates the pre-stressing of the concrete. Findings. When determining stresses, checking calculations by analytical method and the method of modeling with the help of the ANSYS program were used. The stress diagrams along the lower and upper fibers of a metal I-beam and stresses in concrete in the upper and lower zones of the beam were constructed. The analysis of the results showed that the pre-bending of a metal beam can be used to create a pre-stressing, which improves the performance of steel-reinforced concrete span structures, increases their rigidity and allows using of such a structure to increase the balks of railway and highway bridges. Originality. In the paper, a study of the stress-strain state of steel-reinforced concrete beams of the railway span structure was carried out, taking into account the pre-stressing of the concrete. A method of manufacturing a steel-reinforced concrete beams is proposed, which provides pre-stressing of the reinforced concrete due to the bending of a steel I-beam. Practical value. As a result of the calculations, it was found that the structure, when manufactured by the specified method, has greater rigidity compared to reinforced concrete or metal beams. The height of the beam can be lower compared to reinforced concrete or metal span structures. These circumstances are essential for railway bridges, especially for high-speed traffic ones.

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Berlinov, Mikhail, Marina Berlinova i Artem Grigorjan. "Operational durability of reinforced concrete structures". E3S Web of Conferences 91 (2019): 02012. http://dx.doi.org/10.1051/e3sconf/20199102012.

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The resistance properties of reinforced concrete and reinforcement, required for modeling the degradation and calculations of the durability of reinforced concrete elements under the conditions of various types of corrosion damage, based on analytical and experimental data are substantiated. A probabilistic model has been developed for predicting and estimating the durability and reliability of reinforced concrete elements, taking into account the statistical variability of the calculation parameters and the kinetics of degradation processes during long periods of operation. Methods are proposed for calculating and predicting the durability of reinforced concrete elements based on deterministic probabilistic models of degradation of structural elements operating under aggressive environmental influences.

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RUBIN, O. D., S. E. LISICHKIN i O. V. ZYUZINA. "STRENGTH OF LOW-REINFORCED CONCRETE STRUCTURES WITH THE INTERBLOCK CONSTRUCTION JOINTS REINFORCED BY PRESTRESSED BASALT-COMPOSITE BARS". Prirodoobustrojstvo, nr 1 (2021): 53–62. http://dx.doi.org/10.26897/1997-6011-2021-1-53-62.

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Many slightly reinforced concrete structures of operating hydraulic structures need strengthening. Traditional methods of strengthening (by reinforced concrete, metal structures, etc.) have significant disadvantages. A method of strengthening by external reinforcement systems based on carbon fiber which is effective in cases where there is an access to the tension zone of the reinforced structures begins to spread. The authors propose to strengthen slightly reinforced concrete structures of the operated hydraulic structures with pre-stressed basalt composite reinforcement placed in the pre-drilled holes in the concrete of the reinforced structures. To substantiate the proposed technical solutions there was carried out a set of experimental studies of characteristic slightly reinforced concrete structures of hydraulic facilities (including those with inter-block construction joints) reinforced with pre-stressed basalt composite reinforcement. The results of experimental studies have shown the effectiveness of strengthening low-reinforced concrete structures of operating hydraulic facilities with inter block construction joints by means of pre-stressed: longitudinal basalt composite reinforcement and transverse reinforcement.

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Tho, Vu Dinh, Elena Anatolyevna Korol, Nikolai Ivanovich Vatin i Hoang Minh Duc. "The Stress–Strain State of Three-Layer Precast Flexural Concrete Enclosure Structures with the Contact Interlayers". Buildings 11, nr 3 (1.03.2021): 88. http://dx.doi.org/10.3390/buildings11030088.

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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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Itou, M., T. Takahashi, H. Tanaka i T. Tanabe. "Development of FS Concrete for Reinforced Concrete Structures". Concrete Journal 38, nr 10 (2000): 10–21. http://dx.doi.org/10.3151/coj1975.38.10_10.

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Apostolidi, Eftychia, Nikolitsa Karela i Stephanos Dritsos. "Upgrading Reinforced Concrete Structures by Adding New Concrete". IABSE Symposium Report 99, nr 7 (6.05.2013): 1663–70. http://dx.doi.org/10.2749/222137813806521333.

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Rubin, Oleg D., Sergey E. Lisichkin i Oksana V. Zyuzina. "Experimental studies of the stress-strain state of reinforced concrete structures strengthened by prestressed basalt-composite rebar". Structural Mechanics of Engineering Constructions and Buildings 17, nr 3 (24.10.2021): 288–98. http://dx.doi.org/10.22363/1815-5235-2021-17-3-288-298.

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Relevance. In recent years, composite materials have become widespread in the construction of reinforced concrete structures for industrial, civil and transport structures. It is proposed to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite rebar. It took an experimental and theoretical substantiation of technical solutions to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite reinforcement. The aim of the work was to carry out a set of experimental and theoretical studies of the stress-strain state and internal forces in low-reinforced concrete structures of hydraulic structures reinforced with prestressed basalt composite rebar. Methods. Experimental studies of the stress-strain state and internal forces were carried out on the basis of low-reinforced concrete beam-type models with interblock construction joints, harden with prestressed basalt composite reinforcement in the stretched (compressed) zones of the models. Theoretical studies of the stress-strain state and internal forces were carried out on the basis of the theory of reinforced concrete and structural mechanics. Results. As a result of the research carried out on typical low-reinforced concrete structures of hydraulic structures with interblock construction joints, the main stages of the stress-strain state of hydraulic reinforced concrete structures were formulated. Based on the data of experimental and theoretical studies, taking into account the reinforcement with prestressed basalt composite rebar, as well as with prestressed clamps in the shear zone, a method was developed for calculating the strength of low-reinforced hydrotechnical reinforced concrete structures with interblock construction joints.

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Montava, Irles, Pomares i Gonzalez. "Experimental Study of Steel Reinforced Concrete (SRC) Joints". Applied Sciences 9, nr 8 (12.04.2019): 1528. http://dx.doi.org/10.3390/app9081528.

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This research analyzes the solution of reinforced concrete joints reinforced with steel sections, known as steel reinforced concrete (SRC). The aim is to verify the improvement of the ductile characteristics of steel reinforced concrete structures compared to conventional reinforced concrete structures. Another objective is to better understand the experimental behavior and thus be able to perform numerical simulations adjusted with the experimental ones. In addition, the behavior of reinforced concrete structures in all the bars with steel sections is compared with others in which only the joints are reinforced to obtain more efficient and economical structures. All these objectives have the main purpose of improving the behavior of structures against seismic loads. Five specimens of concrete joints with reinforced with steel were tested with cyclic loads to analyze their behavior. The strength superposition method can predict the shear strength. The results obtained confirm the greater capacity of absorption of energy of the structures with sections of steel embedded compared with the structures of conventional reinforced concrete, with greater ductility when facing large displacements.

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Liu, Jun Zhong, Jin Yu Xu, Er Lei Bai i Zhi Gang Gao. "Durability Evaluation Analysis of Reinforced Concrete Structures Based on Extension Method". Advanced Materials Research 163-167 (grudzień 2010): 3354–58. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3354.

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Because of the facts of reinforced concrete structures materials and used environment, very severe durability problems occurred in reinforced concrete structures. Research on reinforced concrete structures durability has become one of the world-wide concern problems in structural engineering. Extension method based on matter-element theory and conjunction function is introduced to evaluate durability of reinforced concrete structures in this paper. The matter-element model for durability evaluation of reinforced concrete structures is established by chose seven evaluation indexes. Applying simple conjunction function to calculate the weight coefficient of evaluation indexes can reduce the error caused by subjective judgment, and makes the results more objective. The research indicates that extension method is reasonable and feasible in evaluating durability of reinforced concrete structures.

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RUBIN, O. D., S. E. LISICHKIN i O. V. ZYUZINA. "THE INFLUENCE OF BASALT-COMPOSITE PRESTRESSED REINFORCEMENT ON THE OPERATION OF LOW-REINFORCED CONCRETE STRUCTURES WITH INTERBLOCK CONSTRUCTION JOINTS". Prirodoobustrojstvo, nr 5 (2020): 50–59. http://dx.doi.org/10.26897/1997-6011-2020-5-50-59.

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It is proposed to use prestressed basalt composite reinforcement to strengthen reinforced concrete structures of hydraulic structures. In order to substantiate technical reinforcement of reinforced concrete structures of hydraulic structures with prestressed basalt composite inforcement, experimental studies were carried out. For experimental studies, reinforced concrete beam-type structures with vertical interblock construction joints were adopted.The results of experimental studies of reinforced concrete models of beam type with interblock joints reinforced with prestressed basalt composite reinforcement by the method of tension “on concrete”are presented. The models are tested for bending moment and transverse force. A special character of cracking is noted; full restoration of the bearing capacity of reinforced concrete structures, weakened by interblock construction joints, was recorded due to the reinforcement of prestressed basalt composite reinforcement.

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Cibulka, Tereza, Luboš Musil i Jan Vodička. "THE LIGHTWEIGHT TEXTILE REINFORCED CONCRETE FOR THIN-WALLED STRUCTURES". Acta Polytechnica CTU Proceedings 22 (25.07.2019): 17–21. http://dx.doi.org/10.14311/app.2019.22.0017.

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The article deals with lightweight concrete with non-conventional reinforcement and its application in thin-walled structures. As part of experimental research, several sets of thin-walled slab and complementary specimen were made to determine the material characteristics of lightweight concrete. The porous aggregate Liapor was used in the recipe. Two-dimensional carbon and 3D glass textiles were used as reinforcement. The impact study of different casting technologies and recipe on the material characteristics of lightweight concrete was included in the research. Fresh concrete for the slab production was placed in special wooden molds. The slabs were concreted in vertical and horizontal position. The casting method has a significant impact on the element material characteristics. Reinforced specimens have shown high strength, even in thin-walled structures with low bulk density.

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Korolko, Serhiy, i Bohdan Seredyuk. "Nanomodified rapid hardening concretes reinforced with dispersed basaltic fibers". Military Technical Collection, nr 24 (20.05.2021): 57–63. http://dx.doi.org/10.33577/2312-4458.24.2021.57-63.

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The article considers modern perspectives and directions of using fast – hardening high – strength concretes for protection against striking factors of action of different types of weapons. It is shown that the use of concrete materials in weapons and military equipment is one of the important components of defense structures and protective fortifications during hostilities as platoons and bases, and structures for the protection of civilians. The possibility of obtaining such concretes for the creation of special purpose fortifications is shown. Developed concrete structures have increased strength and impact resistance to high-speed impact. Due to the reinforcement of the concrete structure with mineral and chemical additives and ultrafine fibers, high rates of early strength, viscosity, crack resistance and impact resistance are achieved. The paper presents the main indicators of water consumption, strength and impact resistance of high-strength concrete. The results of the experimental study of samples of the destroyed concrete elements are presented and the corresponding conclusions concerning the use of various types of fibers for reinforcement of such concretes and increase of their crack resistance by basalt fibers are made. It is shown that a high-strength concrete with high construction and technical performance can be successfully used to create protective fortifications and fortifications for special purposes.

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KOLCHUNOV, VL I. "PLASTICITY MODEL OF REINFORCED CONCRETE STRUCTURES". Building and reconstruction 106, nr 2 (2023): 39–58. http://dx.doi.org/10.33979/2073-7416-2023-106-2-39-58.

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A model of plasticity of reinforced concrete structures is considered, based on on the transformations of the intensity of the “stress-strain” connection by projecting the tensors of this connection, using special transitions for the main angle of deformations, total shear deformations, etc.). At the same time, the modulus of plasticity of concrete, the coefficient of transverse deformations are determined, and complex functions are constructed for linear and angular deformations in sections, taking into account deformation, gradients of deformations during the formation of cracks and stiffness changes. The hypotheses adopted for the calculation model determine the distribution of force flows - blocks for compressed and stretched concrete (first object), "main cracks" from the mechanics of destruction of reinforced concrete, complex functions and a two-cantilever element for modeling the deformation effect of reinforced concrete, developed by the author (second object). Tensile concrete resistance is transferred to the working reinforcement and is modeled using the sum of the average values of the longitudinal and transverse forces, as well as the average reduced coefficient of tension concrete. The "pin (nagel)" effect in the reinforcement crossed by a crack was obtained using the model of the second level of structural mechanics for a reinforcing bar with two pinched ends. The opening of the crack and the shift of the crack edges are simulated. The main force vector in the reinforcement is characterized by the values of longitudinal and transverse displacements (the third object).

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IL'IN, N. A., A. A. PIShchULEV, P. N. SLAVKIN, A. P. ShEPELEV i R. R. IBATULLIN. "RESTORATION COMPRESSED REINFORCED CONCRETE STRUCTURES BUILDINGS". Urban construction and architecture 3, nr 4 (15.12.2013): 62–67. http://dx.doi.org/10.17673/vestnik.2013.04.11.

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The article describes the main provisions: a method for assessing the severity of thermal damage of compressed reinforced concrete structural elements; methods of reducing residual tensile thermal stresses in compressed working armature element; recommendations for restoring lost in fire performance of compressed elements of reinforced concrete structures of buildings and installations.

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Berestianskaya, Svitlana, Evgeniy Galagurya, Olena Opanasenko, Anastasiia Berestianskaya i Ihor Bychenok. "Experimental Studies of Fiber-Reinforced Concrete Prisms Exposed to High Temperatures". Key Engineering Materials 864 (wrzesień 2020): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.864.3.

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Fiber-reinforced concretes are varieties of composite materials. Such materials are commonly used nowadays. Concrete is fiber-reinforced using various fibrous materials, or fibers, which are evenly distributed over the volume of the concrete matrix and simultaneously provide its 3D reinforcement. Fiber-reinforced concrete has better stress-related strength characteristics than ordinary concrete. Since building structures must meet both the strength, rigidity and stability requirements, and the fire safety requirements, then for the extensive use of fiber-reinforced concrete structures, not only the external load design, but also temperature effect design should be conducted in the design phase. The strength and strain characteristics of fiber concrete exposed to high temperatures must be known for this purpose. In view of this, three series of prisms were manufactured and tested: the first series contained no fiber at all (control prisms), the second series contained basalt fiber, and the third series contained steel fiber. The test results showed that adding fibers improves the mechanical characteristics of fiber-reinforced concrete samples under specified conditions.

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34

Wagner, Juliane, Carolin Würgau, Alexander Schumann, Elisabeth Schütze, Daniel Ehlig, Lutz Nietner i Manfred Curbach. "Strengthening of Reinforced Concrete Structures with Carbon Reinforced Concrete—Possibilities and Challenges". CivilEng 3, nr 2 (13.05.2022): 400–426. http://dx.doi.org/10.3390/civileng3020024.

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The strengthening of existing reinforced concrete structures (RC) with carbon reinforced concrete (CRC) has a high potential to save resources and to increase the lifespan of the whole strengthened structure immensely. However, when strengthening structures with CRC, in some cases, failure due to concrete cover separation is detected, leading to the fact that the potential of the carbon reinforcement cannot be exploited. The prediction and prevention of this type of failure is the subject of current research. In this paper, a strut-and-tie-model is presented for calculating a critical tensile force leading to failure due to concrete cover separation. Additionally, possible methods to avoid that kind of failure are suggested. One of these is doweling the ends of the strengthening layer. This paper presents the first experiments to test this method, which show that doweling the strengthening layer leads to much higher failure loads compared to a structure without doweling. However, further investigations have to be examined to verify these first results.

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35

Contamine, Raphaël, i Amir Si Larbi. "Development of a textile reinforced concrete (TRC) to retrofit reinforced concrete structures". European Journal of Environmental and Civil Engineering 20, nr 6 (20.04.2015): 626–42. http://dx.doi.org/10.1080/19648189.2015.1030089.

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Blunt, J., G. Jen i C. P. Ostertag. "Enhancing corrosion resistance of reinforced concrete structures with hybrid fiber reinforced concrete". Corrosion Science 92 (marzec 2015): 182–91. http://dx.doi.org/10.1016/j.corsci.2014.12.003.

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Sucharda, Oldrich, i Jan Kubosek. "Analysis of Reinforced Concrete Slab Structures". Applied Mechanics and Materials 769 (czerwiec 2015): 97–100. http://dx.doi.org/10.4028/www.scientific.net/amm.769.97.

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The paper deals with the designing and analysing of concrete structures. A particular attention is paid to a multi-segment slab made from reinforced concrete. The purpose of the paper is to evaluate, in a non-linear analysis, impacts of input parameters of the concrete on the real load-carrying capacity of the ceiling which has been designed originally in DeMKP. FEM software applications have been used in the analysis. This is an in-house application DeMKP for designing the systems in line with standardised procedures. Another software is ATENA Science which can be used for non-linear analyses.

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Ostrowski, Krzysztof Adam, Carlos Chastre, Kazimierz Furtak i Seweryn Malazdrewicz. "Consideration of Critical Parameters for Improving the Efficiency of Concrete Structures Reinforced with FRP". Materials 15, nr 8 (9.04.2022): 2774. http://dx.doi.org/10.3390/ma15082774.

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Fibre-reinforced polymer materials (FRP) are increasingly used to reinforce structural elements. Due to this, it is possible to increase the load-bearing capacity of polymer, wooden, concrete, and metal structures. In this article, the authors collected all the crucial aspects that influence the behaviour of concrete elements reinforced with FRP. The main types of FRP, their characterization, and their impact on the load-carrying capacity of a composite structure are discussed. The most significant aspects, such as type, number of FRP layers including fibre orientation, type of matrix, reinforcement of concrete columns, preparation of a concrete surface, fire-resistance aspects, recommended conditions for the lamination process, FRP laying methods, and design aspects were considered. Attention and special emphasis were focused on the description of the current research results related to various types of concrete reinforced with FRP composites. To understand which aspects should be taken into account when designing concrete reinforcement with composite materials, the main guidelines are presented in tabular form.

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Wang, Xiao Chu, i Hong Bin Nie. "Research of the CFRP Strengthened Reinforced Concrete Structures". Applied Mechanics and Materials 193-194 (sierpień 2012): 579–83. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.579.

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This paper analyzes mainly that the CFRP reinforced concrete research and FRP cloth reinforced characteristics and advantages, and from the material aspects illustrate the CFRP cloth’s faults. For different components, materials, and the nonlinear programming and analysis, through the integral, combination, discrete type three calculation model of material and materials between, namely, concrete, steel, concrete and reinforced, GFRP cloth, concrete and CFRP cloth the constitutive relation analysis, this paper expounds the present research, points out the existing limitations of the present study and later the research direction. Finally, the paper draw the conclusion that the column and beam mechanical strength, toughness, and crack resistance, impact resistant properties and durability of these aspects to illustrate the superiority of the CFRP reinforced concrete. That fiber reinforced polymer (FRP) strengthening, repairing concrete has broad prospects for development.

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Štěpánek, Petr, Ivana Laníková, Petr Simunek i Pavel Sulak. "The Strengthening of Reinforced Concrete Structures". Key Engineering Materials 738 (czerwiec 2017): 238–48. http://dx.doi.org/10.4028/www.scientific.net/kem.738.238.

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The contribution deals with a method of strengthening reinforced concrete structures. It focuses on the use of non-bonded steel tendons for beams and plates. The strengthening of columns with the help of steel bandages is discussed too. The behaviour of the strengthened items is described, as well as the practical design issues involved. The article also provides information on practical experience gained during the application of the strengthening method.Other possible applications for the strengthening method are discussed, such as the use of materials based on FRP (fibre reinforced polymer), and especially those based on glass.

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41

Bertolini, Luca, Federica Lollini i Elena Redaelli. "Durability design of reinforced concrete structures". Proceedings of the Institution of Civil Engineers - Construction Materials 164, nr 6 (grudzień 2011): 273–82. http://dx.doi.org/10.1680/coma.1000040.

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Gorbach, Pavel, i Klim Gordeev. "INDIRECT REINFORCEMENT OF REINFORCED CONCRETE STRUCTURES". Modern Technologies and Scientific and Technological Progress 2022, nr 1 (16.05.2022): 165–66. http://dx.doi.org/10.36629/2686-9896-2022-1-165-166.

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SHIMAZAKI, Kazushi, i Akira WADA. "SEISMIC DRIFT OF REINFORCED CONCRETE STRUCTURES". Journal of Structural and Construction Engineering (Transactions of AIJ) 444 (1993): 95–104. http://dx.doi.org/10.3130/aijsx.444.0_95.

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Vecchio, F. J., i F. Bucci. "Analysis of Repaired Reinforced Concrete Structures". Journal of Structural Engineering 125, nr 6 (czerwiec 1999): 644–52. http://dx.doi.org/10.1061/(asce)0733-9445(1999)125:6(644).

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Bossio, Antonio, i Francesco Bellucci. "Environmental degradation of reinforced concrete structures". Corrosion Reviews 37, nr 1 (28.01.2019): 1–2. http://dx.doi.org/10.1515/corrrev-2018-0091.

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Malerba, P. G. "Computational mechanics of reinforced concrete structures". European Journal of Mechanics - A/Solids 17, nr 2 (marzec 1998): 367–68. http://dx.doi.org/10.1016/s0997-7538(98)80091-0.

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Sau, Nicolas, Jose Medina-Mendoza i Ana C. Borbon-Almada. "Peridynamic modelling of reinforced concrete structures". Engineering Failure Analysis 103 (wrzesień 2019): 266–74. http://dx.doi.org/10.1016/j.engfailanal.2019.05.004.

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Chan, H. C., Y. K. Cheung i Y. P. Huang. "Nonlinear modelling of reinforced concrete structures". Computers & Structures 53, nr 5 (grudzień 1994): 1099–107. http://dx.doi.org/10.1016/0045-7949(94)90156-2.

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Cope, R. J. "Computational mechanics of reinforced concrete structures". Engineering Structures 20, nr 9 (wrzesień 1998): 857–58. http://dx.doi.org/10.1016/s0141-0296(97)00096-5.

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Schwegler, Gregor, i Thierry Berset. "Methods for strengthening reinforced concrete structures". IABSE Symposium Report 86, nr 8 (1.01.2002): 1–8. http://dx.doi.org/10.2749/222137802796336775.

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