Journal articles: 'Bending reinforced concrete elements'

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Kochkarev, Dmitriy, Taliat Azizov, and Tatyana Galinska. "Bending deflection reinforced concrete elements determination." MATEC Web of Conferences 230 (2018): 02012. http://dx.doi.org/10.1051/matecconf/201823002012.

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Longitudinal reinforced concrete elements stiffness exhaustion, often used in building practice, precedes obtaining bearing capacity, and therefore deflections determination becomes a determining factor in their design. In connection with it precise methods for determining such reinforced concrete elements deflections become especially relevant. The elastic-plastic properties of concrete and cracks in the stretched zone of reinforced concrete elements lead to a significant change in their bending stiffness. That is why the deflections determined by the materials classical resistance formulas differ significantly from the real ones. A large quantity of methods for determining deflections is based on the elastic characteristics correction of reinforced concrete elements consolidated section. Such methods, although providing calculation satisfactory results, are rather approximate and have empirical nature, due to it they have limited application. More precise calculation methods consist of curvature usage to determine deflections. The curvature of reinforced concrete elements cross sections is determined directly from the equilibrium equations, which are written taking into account nonlinear materials deformation diagrams. Calculation examples for bending reinforced concrete elements deflection are given.

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Pavlikov, A., D. Kochkarev, and O. Garkava. "STRENGTH OF REINFORCED CONCRETE IN BENDING ELEMENTS CALCULATIONS." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 48 (March 27, 2017): 62–71. http://dx.doi.org/10.26906/znp.2017.48.227.

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The concept of the design strength of reinforced concrete in bending elements is proposed. This concept can be considered a generalized description of concrete. Such approach makes it possible to consider not only the separate strength of concrete and reinforcement, but also their interaction. The design strength of reinforced concrete is determined by ratio of force, which causes destruction of the standard reinforced concrete specimen, to the corresponding geometric characteristic. It was found that using the introduced concept the calculation of reinforced concrete elements can be reduced to well-known formulas of the strength of materials. It is based on generally accepted hypothesis and stress-strain diagrams of materials. The engineering method is developed, which allows to calculate the strength of the bending reinforced concrete elements of rectangular and circular cross-sections equally simple.

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Abdukhalimjohnovna, Mirzaakhmedova Ugiloy. "Failure Mechanism Of Bending Reinforced Concrete Elements Under The Action Of Transverse Forces." American Journal of Applied sciences 02, no. 12 (December 27, 2020): 36–43. http://dx.doi.org/10.37547/tajas/volume02issue12-07.

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The article under discussion reveals the formation and development of inclined sections in bent reinforced concrete elements under the action of transverse forces. It is established that the strength of the bending element depends on the shape of destruction. Criterion of strength in a flat stress-strain state has been used to evaluate the work of the bending element.

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Kochkarev, Dmytro, Tatyana Galinska, and Oleksandr Tkachuk. "Normal Sections Calculation of Bending Reinforced Concrete and Fiber Concrete Elements." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 176. http://dx.doi.org/10.14419/ijet.v7i3.2.14399.

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The basic principles of the normal sections calculation of reinforced concrete and fiber reinforced concrete bending elements are considered. In the article the power and deformation methods of calculation of reinforced concrete and fiber concrete elements of rectangular cross-section are presented. The deformation model of the calculation of reinforced concrete and fiber concrete elements is presented in the framework of the method of calculation resistance of the section. This method makes possible from the common methodological positions to perform calculations of reinforced concrete and fiber concrete elements. Namely, to select reinforcement and to determine the carring capacity. The proposed deformation model for calculating fiber concrete elements is based on generally accepted preconditions. A hypothesis of plane cross sections is accepted as fair. The deformation diagram of compressed concrete is described by a nonlinear function with established parametric points. Distribution of stresses in stretched concrete is taken rectangular with corresponding coefficients which are taken depending on the type of deformation diagram. Determination of the carring capacity of fiber concrete elements occurs under extreme deformation criteria. Two cases of destruction of the investigated elements are considered. The first case is the destruction due to the achievement of limiting deformations in the concrete of the compressed zone with the simultaneous achievement of the fluidity limit in the working reinforcement. The second case is the destruction due to the achievement of limiting deformations in the concrete of the compressed zone without reaching the fluidity limit in the working reinforcement. Both cases of calculation are reduced to one functional dependence. This avoids the delimitation of different calculation cases. The main no dimensional modifier is the mechanical coefficient of reinforcement. According to the developed method, examples of calculations of reinforced concrete, fiber reinforced concrete elements and fiber concrete elements with longitudinal reinforcement are executed. The possibility of a spread variant design of reinforced concrete and fiber concrete elements is shown.

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ZAMALIEV, F. S., and A. G. TAMRAZYAN. "TO CALCULATION OF STEEL-REINFORCED CONCRETE RIBBED PLATES FOR REFURBISHED FLOORS." Building and reconstruction 97, no. 5 (2021): 3–15. http://dx.doi.org/10.33979/2073-7416-2021-97-5-3-15.

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Analyzes national experience of restoring the old buildings floors. An assessment of the wood-reinforced concrete using experience, steel-reinforced concrete floor structures and methods for calculating load-bearing elements of a composite section is given. It is noted that the current design standards and existing methods for calculating steel-reinforced concrete structures of civil buildings and bridge structures use simplified calculation methods and do not reflect the actual stress-strain state of a bent element, do not take into account the initial pre-operational deformations and stresses, and do not lead to economical design solutions. Sometimes they lead to incorrect results. Expressions of internal moments and forces of steel-reinforced concrete bending elements are presented from the equilibrium conditions of a composite element, taking into account pre-operational forces. The results of our own experiments are presented, where it is shown that during the hardening of concrete, beams and slabs receive deformations in the form of reverse deflection (bending), and internal stresses arise in the sections of steel-reinforced concrete elements. Formulas are given for calculating the deflections of bending elements taking into account their initial deformations. To compare the calculation results of the proposed method for calculating steel-reinforced concrete elements, taking into account the initial deformations and stresses, the data of our own experiments were used and comparisons were given. Satisfactory convergence of the results is shown.

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Karpenko, N. I., Vl I. Kolchunov, and V. I. Travush. "CALCULATION MODEL OF A COMPLEX STRESS REINFORCED CONCRETE ELEMENT OF A BOXED SECTION DURING TORSION WITH BENDING." Russian Journal of Building Construction and Architecture, no. 3(51) (July 21, 2021): 7–26. http://dx.doi.org/10.36622/vstu.2021.51.3.001.

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Statement of the problem. Based on the analysis of domestic and foreign scientific publications and guidelines, it is found that the known deformation models for the calculation of complex tensile reinforced concrete elements during torsional bending are quite conditional. Therefore the article considers the solution of the problem of designing a computational model of a reinforced concrete element during torsion with bending in the post-crack stage, which most fully accounts for the specifics of crack formation, deformation and destruction of such elements. The case is considered for when among all possible external influences the action of torques and bending moments has the greatest influence on the stress-strain. Results. Using the equations of statics and physical ratios of reinforced concrete, the calculated parameters are identified such as stresses in concrete of compressed zone, height of compressed concrete, stresses in clamps, deformations in concrete and reinforcement, curvature and torsion angle of reinforced concrete element. Conclusions. The obtained analytical dependences were tested by means of numerical calculation of the reinforced concrete strapping crossbar of the outer contour of a residential building of box section of high-strength concrete. The suggested deformation model can be employed in the design of a wide class of reinforced concrete structures working on torsional bending.

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Sarkisov, Dmitriy, Nikolay Gorlenko, Gleb Gorynin, Yuri Sarkisov, Gafurzhan Izmailov, and Tatyana Shepelenko. "Strength and deformability of reinforced concrete elements under oblique eccentric short-term dynamic compression, tension and bending." E3S Web of Conferences 164 (2020): 14008. http://dx.doi.org/10.1051/e3sconf/202016414008.

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The paper deals with research data of reinforced concrete rectangular and I-shaped cross-section elements, operating under oblique eccentric short-term dynamic compression, tension and bending. The method of reinforced concrete elements calculation using the theory of surfaces of relative resistance regarding strength and crack resistance is suggested. It is based on the deformation model with the use of real nonlinear diagrams of concrete and reinforcement. This method makes it possible to observe strength and crack resistance of reinforced concrete elements sections in the entire range of loadings from the central tension to axial compression. Experimental investigation of symmetrically reinforced concrete elements on oblique eccentric short-term dynamic compression, tension and oblique bending was carried out. Effect of longitudinal force level on strain distribution through the depth of section, bearing capacity, the failure scheme and other parameters are estimated.

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PANFILOV, Denis A., Nikolay A. ILIYIN, Sergey S. MORDOVSKY, and Yana A. BUZOVSKAYA. "EXPERIMENTAL TEST INSTALLATION OF BENDING REINFORCED CONCRETE BEAM ELEMENTS." Urban construction and architecture 9, no. 3 (September 15, 2019): 12–16. http://dx.doi.org/10.17673/vestnik.2019.03.2.

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The article outlines a new technical solution related to the field of construction, in particular to the testing technique, the testing of materials and structures, and the application for conducting experimental studies of the strength and deformability parameters of reinforced concrete beam elements under static bending conditions. The experimental installation includes a pre-assembled booth, a loading mechanism, a force measuring device, a thrust element and a strap clamp. In this case, the stand contains a stop element, jacks, tensioning clamps, test specimen. The supporting element is composite and contains a base in the form of a channel and an amplifier in the form of a two-lobe. Clamping hooks are made in the form of tight fastened anchorages, equipped with roller supports. As a loading device, jacks are installed in the crevice-slot of the channel and secured by mounting screws to the base of the thrust element. The compact, simple and easy experimental installation with the increased reliability of the power device, tensioning clamps and roller bearings of the subject under bending of the concrete sample is offered.

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Gomon, Svyatoslav, Vitaliy Marchuk, Oleksandr Nalepa, Volodymyr Romanyuk, and Yuriy Ziatіuk. "Effective methods to strengthen the bending reinforced concrete elements." ACTA SCIENTIARUM POLONORUM - Architectura Budownictwo 21, no. 1 (February 25, 2022): 51–56. http://dx.doi.org/10.22630/aspa.2022.21.1.6.

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Holčapek, Ondřej. "Investigation of Bending Capacity of Concrete Elements Strengthened by Textile Reinforced Concrete." Applied Mechanics and Materials 827 (February 2016): 227–30. http://dx.doi.org/10.4028/www.scientific.net/amm.827.227.

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Presented contribution deals with using textile reinforced concrete containing newly invented high strength cement matrix for strengthening concrete structures. The issue of old concrete ́s surface interaction with newly applied slim layer of textile reinforced concrete is investigated and verified by bending test. Water to binder ration under 0.3, maximum size of used silica sand 1.2 mm, and compressive strength over 100 MPa characterize used fine grain cement matrix. Over 12 months old beams with dimension 100 x 100 x 400 mm made from ordinary concrete were used for strengthening during performed experimental program. Strengthening took place on bending side. Different number (1, 3 and 5) of textile fabrics made from alkali-resistant glass (surface density 275 g/m2) was applied into slim layer of cement composite. Increasing number of used fabrics leads to different failure mode due shearing force action.

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Krasnoshchekov, Y. V. "LATERAL FORCE PERCEIVED BY CONCRETE IN THE INCLINED SECTION OF REINFORCED CONCRETE ELEMENTS." Vestnik SibADI 15, no. 3 (July 11, 2018): 434–44. http://dx.doi.org/10.26518/2071-7296-2018-3-434-444.

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Introduction. The article presents results of the empirical dependence analysis of transverse force in the inclined section of reinforced concrete elements.Materials and methods. Long-term application of such dependence at the reinforced concrete design demonstrates high parameters’ reliability. Thus, analyzed information could be used in innovated calculation model, which includes joint action of cross forces and bending moments.Results. The analysis of empirical dependence by the design standards seems to obtain information about the limit value of shear stresses in the compressed zone of inclined concrete and their interrelations with normal stresses. The results of the analysis were tested on computer models of the beam using finite elements. It does, however, assume that the shear resistance is specifically related to compression resistance by means of a special coefficient, which could be determined by computer simulation.Discussion and conclusions. The calculated values of the inclined section of reinforced concrete elements in the transverse bending could be specified by experimental or computer modeling.

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Blikharskyy, Zinoviy, Dmytro Dubizhanskyy, and Roman Khmil. "Investigation of the bearing capacity of reinforced concrete beams strengthened with reinforced concrete ring under load." Budownictwo i Architektura 13, no. 3 (September 11, 2014): 065–70. http://dx.doi.org/10.35784/bud-arch.1766.

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Bearing capacity of normal cross section of bending concrete elements reinforced with reinforced concrete ring under load was investigated. Experimental researches of 4 sets of beams with the total number of 16 units were carried out. The results of changes of stress-strain state settings depending on the load level, additional reinforcement, influence of limit level load were analyzed. The three characteristic stages of stress-strain state of reinforced concrete beams strengthened with reinforced concrete ring were defined. Results of experimental investigations of bearing capacity of normal cross section of strengthened beams with reinforced concrete ring under load were presented. Enhancing effect was calculated. According to the results of researches of strengthened beams plots of strain of working armature depending on current bending moment were constructed.

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Smolyago, G., and Y. Obernikhina. "STRENGTH AND DEFORMATION OF BENDED REINFORCED CONCRETE ELEMENTS REINFORCED WITH CARBON FIBER." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 4 (April 11, 2022): 25–38. http://dx.doi.org/10.34031/2071-7318-2021-7-4-25-38.

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Reinforcement of reinforced concrete flexible elements with polymer composite materials has found wide application in modern construction, so the accumulation of experimental studies of the strength of such structures is relevant. This paper presents the results of experimental studies of the stress-strain state of flexible reinforced concrete elements forced with carbon fiber. Namely, six beams of three types. The first type of beams - reference samples without reinforcement. The second type of beams – beams loaded at the stage corresponding to the standard load, in the presence of cracks and deflections, reinforced with carbon fiber, by gluing it to a stretched zone with a U-shaped anchorage on the supporting areas after unloading. The third type of beams includes samples reinforced, similar to the second type of beams but before the application of loads. In addition, during the experimental study, control images of concrete, rebar and carbon fiber were tested to establish their basic physical and mechanical characteristics. The limit values of experimental bending moments in the middle of the span of samples of all series are obtained. It was found that all samples externally reinforced with carbon fiber were destroyed as a result of increasing the width and height of normal cracks located in the zone of pure bending and increasing deflections, which led to the separation of the composite material from the concrete and the indent of the concrete of the compressed zone

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Wolf, Benjamin, Andrea Kustermann, Christian Schuler, Christoph Dauberschmidt, and 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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Galinska, Tatyana, Dmytro Ovsii, and Mykola Ovsii. "The Combining Technique of Calculating the Sections of Reinforced Concrete Bending Elements Normal to its Longitudinal Axis, Based on the Deformation Model." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 123. http://dx.doi.org/10.14419/ijet.v7i3.2.14387.

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Methodical foundations for calculating the strength of normal sections of various types of steel-concrete bending elements are proposed, which allow calculating in dependence on the stress-strain state (SSS) at the moment of destruction of its components (concrete and structural reduced steel profile). The basis of the calculation allows solving two problems: the problem of determining the optimal section of reduced structural steel profile (RSSP), which reinforced the section of steel-concrete bending elements; the task of verifying the load-bearing capacity of a normal reduced section of various types of steel-concrete bending elements.

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Křístek, Vladimír, Jaroslav Průša, and Jan L. Vítek. "Torsion of Reinforced Concrete Structural Members." Solid State Phenomena 272 (February 2018): 178–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.272.178.

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According to the common design methods of calculation of the stress state induced by torsion of massive prismatic concrete structural elements, the structural system is reduced to a simple cage consisting of ties and struts. This model has, however, a number of principal shortcomings, the major of them is the fact that all of simultaneously acting effects like axial forces, bending moments and shear forces are not taken into account – the compressive axial forces increase very significantly the torque capacity of structural members, while due to action of tensile forces, bending moments and shear forces the torque capacity is reduced. These phenomena, applying non-linear approaches, are analysed and assessed.

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Słowik, Marta. "The analysis of load carrying capacity and cracking of slightly reinforced concrete members in bending." Budownictwo i Architektura 2, no. 1 (June 11, 2008): 065–78. http://dx.doi.org/10.35784/bud-arch.2312.

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Slightly reinforced concrete members are the members made by concrete with reinforcement less than minimum given in codes for reinforced concrete ones. Plain concrete and slightly reinforced concrete members in bending are treated in the same way during the dimensioning and the influence of longitudinal reinforcement on the load carrying capacity is not taken into account. The mechanism of work and crack formation in slightly reinforced concrete members is not completely recognized. The author’s own research program was made. The experiment was aimed at the determination of cracking moment and load carrying capacity of slightly reinforced concrete beams with different reinforcement ratio. Also plain concrete beams and the typical reinforced concrete beam were tested. The analysis of the obtained values of maximum bending moment and crack’s widths was made according to the reinforcement ratio. The analysis of test results shows how the presence of longitudinal steel bars in concrete members, even when reinforcement ratio is low, changes cracking process and influences the value of cracking moment in flexural members. On the basis of test results, the method how to calculate the load carrying capacity of slightly reinforced concrete elements in bending has been proposed.

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C. S. Gahou, Sylvestre, Gildas F. Godonou, Ernesto C. Houehanou, Mohamed Gibigaye, and Gerard L. Gbaguidi Aisse. "STUDY OF THE RESISTANCE TO RUPTUREAND DEFORMATION OF A BENT BEAM MADE OF OIL PALM KERNEL SHELL (OPKS) CONCRETE REINFORCED WITH BORASSUS AETHIOPUM MART (RONIER)." International Journal of Advanced Research 10, no. 01 (January 31, 2022): 692–703. http://dx.doi.org/10.21474/ijar01/14092.

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The present study is related to the simple bending performance of a structural element made of Oil Palm Kernel Shell Concrete (OPKSC) reinforced with Borassus Aethiopum Mart (ronier). An experimental program with the use of three (03) distinct approaches of formulation was developed. These are respectively the formulation approaches proposed by Gibigaye et al (Gibigaye et al., 2017) and Yasmine et al (Traore et al., 2015) for OPKSC and the one proposed by DreuxGorisse for conventional aggregate concretes that served as control concrete. Reinforced roast concrete beams of size 150 mm Ã— 150 mm Ã— 910 mm were developed in accordance with NF EN 12390-1 and subjected to four (04) point bending until failure. It was observed an improvement of the bending strength of the OPKSC compared to the conventional aggregate concrete with a rate ranging from 3 to 80% depending on the type of formulation used. Similarly, the use of plasticizers improves the bending strength of OPKSC by more than 75%. Moreover, we notice the appearance of the first cracks as soon as the applied load reaches 60% of the breaking strength in bending which emphasizes the ductile behavior of OPKSC reinforced with roast. The OPKSC reinforced with ronier is a material suitable for use in the bent elements of the structure of lightly loaded buildings.

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Garnytsky, Vitaliy, and Sofya Kurnavina. "The field of crack directions in reinforced concrete bending elements." IOP Conference Series: Materials Science and Engineering 365 (June 2018): 052026. http://dx.doi.org/10.1088/1757-899x/365/5/052026.

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KUTSYK, Olena, and Oleksandr ZHURAVSKYI. "EXPERIMENTAL AND THEORETICAL STUDIES OF REINFORCED CONCRETE BENDING ELEMENTS MADE OF HIGH-STRENGTH CONCRETE." Building constructions. Theory and Practice, no. 9 (December 28, 2021): 87–93. http://dx.doi.org/10.32347/2522-4182.9.2021.87-93.

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The use of quality materials is necessary for the manufacture of load-bearing reinforced concrete structures that are subject to heavy loads. To meet such requirements, it is necessary to use high-strength concrete, which has high compressive strength, water and gas tightness, corrosion resistance due to its dense structure. The use of high-strength concrete makes it possible to reduce the cross-sectional dimensions of structures, thereby reducing the weight of structures compared to structures of traditional classes of concrete.The results of experimental and theoretical researches of work of reinforced concrete beams from high-strength and ordinary concrete at crossbending are resulted in work.A program of experimental research has been developed, which includes the manufacture and testing of concrete samples of prisms and cubes todetermine the strength and deformation characteristics of concrete of different composition, the manufacture and testing of experimental reinforcedconcrete beams for transverse loading. Three series of rays were tested, four in each. The composition of the concrete mixture for high-strength concreteusing metakaolin and hyperplasticizer is proposed.The proposed algorithm for calculating the bearing capacity of bending elements, based on the method of deformation, allows obtaining resultswith sufficient accuracy. The calculation is performed according to the developed algorithm, which is implemented in the Mathcad program.The analysis of experimental and theoretical values of bearing capacity of reinforced concrete beams from high-strength and usual concrete attransverse bend.

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Saarenheimo, Arja, Kim Calonius, Markku Tuomala, and Ilkka Hakola. "Soft Missile Impact on Shear Reinforced Concrete Wall." Journal of Disaster Research 5, no. 4 (August 1, 2010): 426–36. http://dx.doi.org/10.20965/jdr.2010.p0426.

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In developing numerical approaches for predicting the response of reinforced concrete structures impacted on by deformable projectiles, we predict structural behavior collapse and damage using simple analysis and extensive nonlinear finite element (FE)models. To verify their accuracy, we compared numerical results to experimental data and observations on impact-loaded concrete walls with bending and transverse shear reinforcement. Different models prove adequate for different cases and are sensitive to different variables, making it important to rely on more than a single model alone. For wall deformation in bending mode, deflection is predicted reasonably well by simple four-node shell elements. Where punching dominates, transverse shear behavior must be considered. Formation of a shear failure cone is modeled using three-dimensional solid elements.

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KURNAVINA, S. O., and I. V. TSATSULIN. "THE INFLUENCE OF UNCLOSED CRACKS IN COMPRESSED ZONE OF CONCRETE ON THE BEARING CAPACITY OF BENDING REINFORCED CONCRETE ELEMENTS." Building and reconstruction 94, no. 2 (2021): 28–38. http://dx.doi.org/10.33979/2073-7416-2021-94-2-28-38.

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One of the most important issues when calculating buildings and structures for seismic effects is taking into account the presence of damage in the compressed zone of concrete. It is known that the current norms of the Russian Federation [4] on earthquake-resistant construction assume the development of plastic deformations in structural elements. When determining the loads, the possibility of developing plastic deformations in structural elements is taken into account by introducing a decreasing coefficient K1, while neglecting the effect of plastic deformations on the strength of bearing reinforced concrete elements. The presence of plastic deformations in the reinforcement leads to the appearance of residual cracks in the compressed zone of concrete and, as a consequence, to a decrease in the bearing capacity of bending elements in subsequent loading cycles. The influence of unclosed cracks in compressed zone of concrete of bending elements on their bearing capacity for symmetrical and non-symmetrical reinforcement, for different values of reinforcement coefficient and for different values of coefficient of plasticity is considered. Based on the results of calculations the bearing capacity data for bending reinforced concrete elements with residual cracks in compressed zone of concrete have been obtained. The approximate method of determination of residual cracks depth in compressed zone of concrete in terms of coefficient of plasticity in the first semi cycle of loading is proposed.

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Williams Portal, Natalie, Mathias Flansbjer, Kamyab Zandi, Lech Wlasak, and Katarina Malaga. "Bending behaviour of novel Textile Reinforced Concrete-foamed concrete (TRC-FC) sandwich elements." Composite Structures 177 (October 2017): 104–18. http://dx.doi.org/10.1016/j.compstruct.2017.06.051.

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Mkrtychev, Oleg, and Mikhail Andreev. "Verification of the reinforced concrete beam model based on the results of a full-scale experimental study." MATEC Web of Conferences 196 (2018): 01029. http://dx.doi.org/10.1051/matecconf/201819601029.

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The article presents the results of a numerical experiment consisting in a bending test of a reinforced concrete beam and comparison of the results obtained with the results of full-scale experiments. In most cases, it is not possible to adequately consider all types of nonlinearities when using simplified bar and plate elements. The problem can be solved by using more detailed computational models with solid finite elements, allowing to consider directly the joint behavior of reinforcing bars and concrete. The studies were carried out in the LS-DYNA software package, which implemented the nonlinear concrete model – Continuous Surface Cap Model (CSCM). This model allows to consider the joint behavior of reinforcing bars and concrete, using bar (for reinforcing bars) and solid (for concrete) finite elements, thereby helping to overcome existing shortcomings in the diagrams of concrete behavior. As an object of modeling, a reinforced concrete statically determinable beam of rectangular section with dimensions of 1,000 х 50 х 100 (h) mm is considered. The conducted studies showed that the ultimate load on the beam based on the results of numerical modeling is quite consistent with the experimental value (8.5% discrepancy). The arrangement of cracks and the fracture pattern obtained from the modeling results in the LS-DYNA software package are in good agreement with the results of the tests. The LS-DYNA software package will allow correct solid modeling of bending reinforced concrete elements with specification of nonlinear diagrams of concrete and reinforcing bars deformation and can be used for research, calculation and design of reinforced concrete elements of buildings and structures.

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Renić, Tvrtko, and Tomislav Kišiček. "Ductility of Concrete Beams Reinforced with FRP Rebars." Buildings 11, no. 9 (September 21, 2021): 424. http://dx.doi.org/10.3390/buildings11090424.

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Concrete beams reinforced with FRP rebars have greater durability than standard steel reinforced elements. The main disadvantage of using FRP rebars is the low ductility of elements which may be unacceptable in certain situations. There are several different ways of increasing the ductility of concrete elements, which are analyzed in this paper. They are compared based on efficiency, influence on durability and ease of construction. Less analyzed and tested methods are given more attention to try and expand the current knowledge and possibilities. For methods that lack experimental data, theoretical analysis is undertaken to assess the possible influence of that method on the increase in ductility. Ductility was obtained by calculating bending moment–curvature diagrams of cross sections for different reinforcement layouts. One method that lacks experimental data is confining the compressive area of beams with tensile FRP reinforcement. Theoretical analysis showed that confining the compressive area of concrete can significantly increase the ductility and bending capacity of beams. Since experimental data of beams reinforced with FRP rebars in tension and confined compressive area is sparse, some suggestions on the possible test setups are given to validate this theoretical analysis. Concrete beams reinforced with FRP can be detailed in such a way that they have sufficient ductility, but additional experimental research is needed.

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Mescheulov, Nikita, and Oleg Kumpyak. "Numerical simulation of stress-strain state of oblique sections of reinforced concrete structures subjected to compression and bending on yielding supports under short-term dynamic load." EPJ Web of Conferences 221 (2019): 01033. http://dx.doi.org/10.1051/epjconf/201922101033.

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This research is aimed at studying the method for improving blast resistance of buildings and structures by using yielding supports. The paper reports the data on dynamic analysis of reinforced concrete elements subjected to compression and bending on yielding supports under the condition of elasto-plastic stress-strain state performed in ANSYS software package. Algorithms and techniques for dynamic amplification factor calculation for reinforced concrete elements subjected to compression and bending are presented. The paper provides load diagrams of dynamic amplification factors with the account of yielding capacity of supports for subsequent dynamic analysis of structures for equivalent static load.

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Babich, Volodymyr, Olena Polianovska, and Igor Shvets. "THE DETERMINATION OF PARAMETERS OF COMBINED REINFORCEMENT OF STRETCHED AND BENDING REINFORCED CONCRETE ELEMENTS WITH THE SPECIFIC CRACK RESISTANCE." Collected scientific works of Ukrainian State University of Railway Transport, no. 198 (May 12, 2022): 40–49. http://dx.doi.org/10.18664/1994-7852.198.2021.256536.

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Recently, there has been an increase in the use of reinforced concrete structures withcombined reinforcement in construction, which makes it possible to increase the resistance of suchstructures to deformation and cracking. Dispersed reinforced concrete was used to cover roads, flooring in industrial buildings, the manufacture of curbs and more. For the construction of publicand industrial buildings, the use of combined reinforced structures has not been widely used, as noperfect method of their calculation has been developed.Combined reinforcement structures include concrete structures that are reinforced with steelrods and steel fiber, which is randomly arranged in the mass of concrete. The strength of reinforcedconcrete depends on such factors as: the strength of concrete, reinforcement with rod reinforcement,the type of fiber and its characteristics, the volume of fiber per unit volume of concrete, the size ofthe cross section of the elements. These factors affect the tensile strength of reinforced concrete bothdirectly and by their interaction. Therefore, determining the effective parameters of dispersedconcrete reinforcement is a complex multivariate task, its solution is proposed to be achieved byperforming mathematically planned experiments.When choosing the parameters of dispersed reinforcement of centrally stretched and bendingreinforced concrete elements (lower truss belt, arch tightening, cylindrical tank wall, beams, slabs),it is advisable to choose the strength of concrete fck, fiber length lf and volume dispersion coefficient.The optimal choice of values of these parameters is proposed to be performed using quadraticregression equations, which are based on the results of three-factor three-level mathematicallyplanned experiments, which are based on the matrix of the Box-Behnken plan.The obtained mathematical models make it possible to analyze the influence of dispersereinforcement parameters on crack formation forces in combined reinforced concrete elements andto determine their optimal values. The use of combined reinforcement allows increasing the crackresistance of reinforced concrete elements in two or more times.

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Kowalski, R., M. Głowacki, and J. Wróblewska. "Thermal Bowing of Reinforced Concrete Elements Exposed to Non-Uniform Heating." Archives of Civil Engineering 64, no. 4 (December 1, 2018): 247–64. http://dx.doi.org/10.2478/ace-2018-0055.

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AbstractThe paper presents the test description and results of thermal bowing of RC beams exposed to non-uniform heating at high temperature. Bending of a non-uniformly heated element is caused by free thermal elongation of the material it is made of. The higher the temperature gradient, the greater the bending. In the case when an element is exposed to load and high temperature simultaneously, apart from free bending also deformation of the RC element may occur, which is caused by the decrease of the concrete or reinforcing steel mechanical properties. In order to examine the contribution of the deflection caused by thermal bowing to the total deformation of the bent element with a heated tension zone, an experimental study of freely heated (unloaded) beams was performed. RC beams were heated: (1) on three sides of the cross-section or (2) only on the bottom side. Deflection of elements loaded by a substitute temperature gradient was calculated using the Maxwell–Mohr formula. The test results show that deflection of freely heated RC beams (caused by the thermal bowing phenomenon) can be 10 to 20% of the total deflection of loaded RC beams with a heated tension zone.

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Rubtsov, Igor, and Oleg Rubtsov. "Geodetic monitoring of deflections of reinforced beams and reinforcing elements under variable static loading." E3S Web of Conferences 164 (2020): 08026. http://dx.doi.org/10.1051/e3sconf/202016408026.

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In the framework of the present study was carried out monitoring of reinforced concrete structures subjected to reinforcement. As reinforcement elements, steel channels were used, rigidly connected to a reinforced concrete beam to be reinforced. Object of research: systems of quasi-continuous observations of the parameters of the construction object carried out on the basis of the monitoring system. Subject of research: identification of the possibility of using various systems, in particular, geodetic and strain gauge monitoring, to monitor the bending of reinforced concrete elements and, in particular, reinforced concrete beams. Aim: Comparative analysis of strain gauge and geodetic monitoring in the process of fixed changes in static loads on structural elements. Materials and methods: the initial materials for this study were the results of geodesic and strain gauge monitoring during statistical step-by-step loading of reinforced concrete beam by steel channels. Results: on the basis of the obtained dependences of the deflection of elements of reinforced and reinforcing structures in time during their step-by-step statistical loading the possibility of using geodetic control is shown. Conclusions: The possibility of using geodesic and strain gauge methods for monitoring reinforced concrete structures is proved.

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Gorbunov, Igor, and Vladimir Kakusha. "Behavior of concrete beams reinforced with FRP during bending." E3S Web of Conferences 263 (2021): 02052. http://dx.doi.org/10.1051/e3sconf/202126302052.

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Article describes methods and results of experimental research for strain behavior, crack formation and fracture of concrete beams reinforced with fiber reinforced polymer (FRP) bars during bending moment action. 18 beams (3+3 series) reinforced with glass FRP (GFRP) and basalt (BFRP) 6, 10 and 14 mm in diameter were tested. Deflection in the middle of the beam, concrete and bars strain and ultrasonic transmission time for 4 routes were measured during tests besides visual inspection. Main crack formation occurred at 8-20% of the ultimate load for all beams. Crack formation was transition border to linear (elastic) straining at low bending stiffness. More than 15 times decrease in bending stiffness was seen for beam reinforced with two types of bars 6 mm in diameter compared to initial values. Existence of main cracks and major deflections is not allowed during design of bending elements. However small bending stiffness at linear elastic straining is a positive factor in case of «hard» loading and impact (pulsed) loading. It is possible to prevent structures collapse and people deaths at impact loading and cyclic «hard» loading by permitting crack formation in load bearing structures.

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Zhang, Yu Xu. "The Anti-Bending Bearing Capacity Analysis of the Reinforced RC Girder with External Prestress Base on ABAQUS." Advanced Materials Research 378-379 (October 2011): 374–78. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.374.

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The reinforced RC girder with external prestress is applied more and more widely. Reinforcement of the girder is influenced by various factors, among which the concrete intensity degree and the prestress degree are mainly analyzed through the finite element software ABAQUS to learn their influence on the anti-bending bearing capacity of the externally reinforced RC simply supported beam. Since the reinforcement stresses of RC girder (regular reinforced concrete beam) are far less than the maximum intensity of the reinforcing steel bar, the concrete in the pulled area cracks, which causes the stiffness of constructional elements to decrease, deform and expand so that the elements become useless before it is damaged. External prestress can effectively improve such defect of the RC girder, and a great deal of research has been carried out. Due to the experimental boundedness and discreteness, large general finite element software ABAQUS is adopted to analyze the anti-bending bearing capacity of the externally reinforced RC girder, which is based on the size of experimental constructional elements in literature.

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Pavlikov, Andriy, Marta Kosior-Kazberuk, and Olha Harkava. "Experimental Testing Results of Reinforced Concrete Beams Under Biaxial Bending." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 299. http://dx.doi.org/10.14419/ijet.v7i3.2.14423.

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The experimental tests data of reinforced concrete beams of a rectangular profile made of heavy concrete on pure biaxial bending are presented. The inclination angle of the external load plane to the vertical axis of inertia of the section varied in the range from 0º to 20º. The tests were conducted to study the work of the biaxial bended elements under load and to verify the developed method for strength analysis of such elements. It has been established that the order of changing the neutral axis position in the section of the biaxial bending beams in the loading process depends primarily on the relative disposition of the external load plane and the resultant in the tensioned reinforcement. It has been confirmed that the ultimate compressed fibrous strains of concrete depend not on the shape of the section, but on the shape of the concrete compressed zone. The results of the tests have good correspondence with theoretical calculations, which proves the expediency of using the developed engineering method for the strength analysis.

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Lehmann, Marek, and Wiesława Głodkowska. "Shear Capacity and Behaviour of Bending Reinforced Concrete Beams Made of Steel Fibre-Reinforced Waste Sand Concrete." Materials 14, no. 11 (June 1, 2021): 2996. http://dx.doi.org/10.3390/ma14112996.

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Inthis paper, we report the results of our research on reinforced concrete beams made of fine aggregate fibre composite, with the addition of steel fibres at 1.2% of the composite volume. The fine aggregate fibre composite is a novel construction material, in which the aggregate used is a post-production waste. Twenty reinforced concrete beams with varying degree of shear reinforcement, in the form of stirrups with and without the addition of steel fibres, tested under loading. The shear capacity results of reinforced concrete beams made of the fine aggregate fibre composite being bent by a transversal force, as well as the cracking forces causing the appearance of the first diagonal crack, are discussed. The stages of functioning of such elements are described. Furthermore, the effect of the steel fibres on the reduction of diagonal cracking is analysed. Computation of the shear capacity of the tested elements is performed, based on the Model Code 2010 and RILEM TC-162 TDF standards, for two variants of the compression strut inclination angle θ that measured during testing, and the minimum(in accordance with the Model Code 2010 standard). We found that the SMCFT method part of Model Code 2010 showed the best compatibility with the experimental results. The tests and analyses performed demonstrate that the developed novel fibrecomposite—the properties of which are close to, or better than, those of the ordinary concrete—can be used successfully for the manufacturing of construction elements in the shear capacity aspect. The developed fine aggregate fibrecomposite could serve, in some applications, as an alternative to ordinary concrete.

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Negrutiu, Camelia, Ioan Sosa, and Bogdan Heghes. "Flexure Behaviour of Reinforced High Strength Concrete Elements Affected by Corrosion." MATEC Web of Conferences 289 (2019): 10009. http://dx.doi.org/10.1051/matecconf/201928910009.

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Corrosion of the reinforcement is a constant vulnerability for reinforced concrete structures exposed to aggressive environments. High strength concrete is known to prevent corrosion of the reinforcement, in a non-cracked state, when exposed to aggressive environments. The purpose of this study is to assess the opportunity of using high strength concrete in cracked elements exposed to corrosion and compare them with non-exposed elements. A series of simply supported reinforced high strength concrete beams with concrete cover of 25 and 50 mm were pre-cracked, up to a service life crack of 0.1 mm, further exposed to accelerated corrosion through a process of electrolysis and finally tested to failure. A series of non-exposed witness specimens were also tested to failure. All elements were designed with the same bending capacity. The flexure behaviour was assessed by plotting experimental and theoretical ultimate limit state position of the neutral axis at midspan and the results show no significant differences in the overall behaviour, despite the affected reinforcement, between the corroded and non-corroded elements. Moreover, the design bending moments were approximately 40% lower than the experimental ones, even for corroded beams, which can be a significant strength reserve of the beams, useful in aggressive environments.

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Bittner, Tomáš, Michaela Kostelecká, Petr Pokorný, Miroslav Vokáč, and Petr Bouška. "Textile Concrete in Adverse Conditions." Key Engineering Materials 776 (August 2018): 59–65. http://dx.doi.org/10.4028/www.scientific.net/kem.776.59.

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Textile concrete (TRC) is a modern material that has been the subject of many scientific studies over the past two decades. It is a material based on a fine-grained cement-based matrix, fiber reinforced, fabric of acrylic-resistant glass, basalt or carbon reinforcement. The products from this material are thin-walled elements, which can be used, for example, for facade claddings elements, lost formwork, shell structures, garden architecture or for strengthening or repair of existing structural elements. This paper presents some examples of the behavior of glass reinforced textile concrete during exposure to road salts, under load of bending moment, at long-term loading at elevated temperatures, and assessment of glass fiber resistance during exposure simulating concrete pore solution.

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SUVOROV, Alexandr A., and Valery B. FILATOV. "ANALYTICAL DESCRIPTION OF THE INCLINED CRACK TRAJECTORY BY THE METHOD OF NONLINEAR DEFORMATION MODEL." Urban construction and architecture 7, no. 3 (September 15, 2017): 14–18. http://dx.doi.org/10.17673/vestnik.2017.03.3.

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The article proposes an analytical solution to determine the trajectory of inclined crack with the use of nonlinear deformation model in the area of the transverse bending of a reinforced concrete beam. The use of nonlinear deformation model for the analysis of stress-strain state of the beam in the zone of the transverse bending allows to determine the coordinates of the inclined crack trajectory, the position of its vertex, and the angle of inclination to the longitudinal axis of the beam. It is then possible to move from the empirical dependences for calculating the strength of the inclined sections to precise analytical techniques. The proposed algorithms calculate and analyze the stress-strain state of reinforced concrete beams create preconditions for the implementation of the physical model of a power resistance of reinforced concrete elements under transverse bending.

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Wang, Guan, Caiqian Yang, Chunlin Meng, Zhenxue Xia, Yong Pan, and Mengwei Wang. "Experimental study on the mechanical and self-sensing behaviors of prestressed carbon fiber–reinforced polymer reinforced concrete composite structures." Advances in Structural Engineering 23, no. 8 (January 3, 2020): 1507–20. http://dx.doi.org/10.1177/1369433219895915.

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A type of self-sensing prestressed carbon fiber–reinforced polymer reinforced concrete composite structure was proposed and studied, composed of reinforced concrete beam, prestressed carbon fiber–reinforced polymer plate, and long-gauge fiber Bragg grating sensors. The carbon fiber–reinforced polymer plate was prestressed and bonded to the bottom of the reinforced concrete beam. Two types of anchorage systems were compared and studied. The long-gauge fiber Bragg grating sensors were used as active elements for the self-sensing of mechanical responses, which were installed on the tensile rebars, carbon fiber–reinforced polymer plates, and concrete. A series of static and fatigue 4-point flexural experiments were carried out to study the bending and fatigue performances of the composite structures. After a prescribed number of fatigue loading cycles, monotonic flexural bending was performed to investigate the deterioration of properties. The results showed that the long-gauge fiber Bragg grating sensor is valid for the mechanical response sensing of the proposed structures. The compatibility of the prestressed carbon fiber–reinforced polymer plate and concrete in the pure bending zone is excellent even under fatigue loading. The load-carrying capacities were improved by more than 30% due to the application of prestressed carbon fiber–reinforced polymer plates. The stiffness was also improved remarkably and generally decreased with the accumulation of fatigue cycles linearly.

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ILYIN, Nikolay A., Sergey S. MORDOVSKY, Vera A. MALGINA, and Nadezhda A. KIREEVA. "CALCULATING THE STRENGTH OF AN EXCENTRALLY COMPRESSED REINFORCED CONCRETE ELEMENT OF RECTANGULAR SECTION." Urban construction and architecture 10, no. 1 (March 15, 2020): 4–8. http://dx.doi.org/10.17673/vestnik.2020.01.1.

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One of the main tasks in the calculation of reinforced concrete elements is the determination of strength. This problem is relevant for structures in various stress-strain states - bending, eccentrically-compressed, eccentrically-stretched, eccentrically-compressed with torsion, etc. This article discusses the solution of the strength problem in the design of an eccentrically compressed reinforced concrete element of rectangular cross section with symmetrical reinforcement. The improvement relates to taking into account the infl uence of structural parameters of the quality of reinforcement and concrete on the value of the design loads and the ultimate tensile strength of an eccentrically compressed reinforced concrete element, taking into account its deflection. By simplifying the mathematical description of the influence of structural indicators and quality parameters of reinforcement and concrete on the calculated value of the bending moment and on the strength of an eccentrically compressed reinforced concrete element, as well as simplifying the calculation of the coefficient of increase in the initial eccentricity of the longitudinal force taking into account the deflection of the compressed reinforced concrete element, this improvement is obtained. Using the proposed formulas in calculating the strength of an eccentrically compressed reinforced concrete element of rectangular cross section allows us to ensure the convergence of the result with the classical version of the calculation with a reduction in labor costs due to the simplicity of the formulas.

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Карпенко, Н. И., Вл И. Колчунов, and В. И. Травуш. "Calculation Model of a Complex Stress Reinforced Concrete Element of a Boxed Section During Torsion with Bending." НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ, no. 2(62) (June 23, 2021): 9–26. http://dx.doi.org/10.36622/vstu.2021.62.2.001.

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Постановка задачи. На основе анализа отечественных и зарубежных научных публикаций и нормативных документов установлено, что известные деформационные модели для расчета сложнонапряженных железобетонных элементов при кручении с изгибом носят достаточно условный характер. В связи с этим в статье рассматривается решение задачи создания расчетной модели железобетонного элемента при кручении с изгибом в стадии после образования трещин, наиболее полно учитывающей специфику трещинообразования, деформирования и разрушения таких элементов. Рассмотрен случай, когда из возможных внешних воздействий наибольшее влияние на напряженно-деформированное состояние оказывает действие крутящего и изгибающего моментов. Результаты. На основе уравнений статики и физических соотношений железобетона определены расчетные параметры, такие как напряжения в бетоне сжатой зоны, высота сжатого бетона, напряжения в хомутах, деформации в бетоне и арматуре, кривизна и угол закручивания железобетонного элемента. Выводы. Полученные аналитические зависимости апробированы численным расчетом железобетонного обвязочного ригеля наружного контура жилого здания коробчатого сечения из высокопрочного бетона. Предложенная деформационная модель может быть использована при проектировании широкого класса железобетонных конструкций, работающих на изгиб с кручением. Statement of the problem. Based on the analysis of domestic and foreign scientific publications and guidelines, it is found that the known deformation models for the calculation of complex tensile reinforced concrete elements during torsional bending are quite conditional. Therefore the article considers the solution of the problem of designing a computational model of a reinforced concrete element during torsion with bending in the post-crack stage, which most fully accounts for the specifics of crack formation, deformation and destruction of such elements. The case is considered for when among all possible external influences the action of torques and bending moments has the greatest influence on the stress-strain. Results. Using the equations of statics and physical ratios of reinforced concrete, the calculated parameters are identified such as stresses in concrete of compressed zone, height of compressed concrete, stresses in clamps, deformations in concrete and reinforcement, curvature and torsion angle of reinforced concrete element. Conclusions. The obtained analytical dependences were tested by means of numerical calculation of the reinforced concrete strapping crossbar of the outer contour of a residential building of box section of high-strength concrete. The suggested deformation model can be employed in the design of a wide class of reinforced concrete structures working on torsional bending.

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Y.M., Mahkamov. "Design Model Of Bending Reinforced Concrete Elements Under Action Of Transverse Forces Under Conditions Of Increased And High Temperatures." American Journal of Engineering And Techonology 02, no. 10 (October 30, 2020): 17–24. http://dx.doi.org/10.37547/tajet/volume02issue10-04.

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In this article, the calculation of the strength and crack resistance of bending elements operating under conditions of high and high temperatures and transverse forces are proposed to be carried out according to a calculation model developed based on an analysis of experimental studies that takes into account more correctly the physics of the stress-strain phenomenon of the element.

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Karpiuk, Vasyl, Yuliia Somina, Oksana Maistrenko, and Fedir Karpiuk. "Simulation of the Stress-Strain State of Eccentrically Compressed and Tensioned Reinforced Concrete Beams." System Safety: Human - Technical Facility - Environment 2, no. 1 (March 1, 2020): 207–14. http://dx.doi.org/10.2478/czoto-2020-0025.

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AbstractThe paper deals with the working peculiarities of the support zones of reinforced concrete elements subject to bending with due account of the eccentric compression and tension. The authors performed simulation of the stress-strain behaviour of the indicated structures with the aid of “Lira” software which results are shown in the graphical and tabulated form. The performed simulation allowed of tracing the work of the studied sample beams till collapse. Such approach made it possible to single out and generalize the main collapse patterns of the inclined cross-sections of the reinforced concrete elements subject to bending on which basis the authors developed the improved method to calculate their strength (Karpiuk et al., 2019).

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Skryabin, A. "Study of Nonlinear Stress-Strain Diagram of Concrete Based on Local Raw Materials in Central Yakutia." Key Engineering Materials 887 (May 2021): 718–24. http://dx.doi.org/10.4028/www.scientific.net/kem.887.718.

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This paper presents the study results of the nonlinear stress-strain diagrams of concrete based on the local materials of Central Yakutia. The results of comparing the obtained data with the requirements of normative documents of the Russian Federation, European countries, India and China are presented. The calculation results for bending bearing elements with concrete nonlinear deformation taken into account obtained using the Ansys software are given. The reliability of the calculated data was verified using the proposed diagrams, using the example of the results of a survey of characteristic failures of bending concrete and reinforced concrete elements in the Republic of Sakha (Yakutia).

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Teng, Le, Rongling Zhang, and Kamal Henri Khayat. "Tension-Stiffening Effect Consideration for Modeling Deflection of Cracked Reinforced UHPC Beams." Sustainability 14, no. 1 (December 31, 2021): 415. http://dx.doi.org/10.3390/su14010415.

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Tension-stiffening effects can significantly influence the flexural performance of cracked reinforced concrete specimens. Such effect is amplified for fiber-reinforced concrete, given the fact that fibers can bridge the cracks. The objective of this study was to develop a model to predict the deflection of cracked reinforced ultra-high performance concrete (R-UHPC) beam elements. The modeling approach characterized the average bending moment of inertia by combining the existing model used for conventional reinforced concrete and the analytical model of stress distribution of UHPC along the cross-section. The finite element analysis (FEA) was employed to evaluate the flexural deflection based on the average bending moment of inertia. The calculated load-deflection relationships have been compared to experimental results. The results indicated that the relative errors of deflection between predicted and experimental results can be controlled within 15%, compared to values ranging from 5% to 50% calculated by neglecting the tensile properties of cracked UHPC and values ranging from 5% to 30% calculated by effective inertia of bending moment of ACI code. Therefore, the developed model can be used in practice because it can secure the accuracy of deflection prediction of the R-UHPC beams. Such a simplified model also has higher sustainability compared to FEA using solid elements since it is easier and time-saving to be established and calculated.

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Larionov, E. A. "Bearing capacity of corroded bending reinforced concrete element." Vestnik MGSU, no. 7 (July 2014): 51–63. http://dx.doi.org/10.22227/1997-0935.2014.7.51-63.

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Gelbrich, Sandra, Henrik L. Funke, Andreas Ehrlich, and Lothar Kroll. "Flexible fiber-reinforced plastic formworks for the production of curved textile-reinforced concrete." Advances in Structural Engineering 21, no. 4 (October 5, 2017): 580–88. http://dx.doi.org/10.1177/1369433217732681.

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A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allows the manufacturing of single- and double-curved textile-reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass fiber–reinforced plastic. Using the unusual structural behavior caused by anisotropy, these glass fiber–reinforced plastic formwork elements permit a specific adjustment of defined curvature. The system design of the developed glass fiber–reinforced plastic formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed, and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads. The developed textile-reinforced concrete had a high three-point bending tensile strength. Beyond that it was ensured that the textile-reinforced concrete had a high durability, which has been shown by the capillary suction of deicing solution and freeze–thaw test with a low amount of scaled material and a relative dynamic E-modulus of 100% after 28 freeze–thaw cycles.

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Akbalık, Hasan Hüseyin, and Ali Sarıbıyık. "Improving the Adhesion of BFRP Strips to the Concrete Surface." Academic Perspective Procedia 2, no. 2 (October 27, 2019): 220–28. http://dx.doi.org/10.33793/acperpro.02.02.29.

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Fiber Reinforced Polymer (FRP) composites are widely used in repair and strengthening of reinforced concrete structural elements. The FRP composite adhered to the concrete surface may be separated from the concrete surface in the form of debonding before reaching the ultimate strength. Epoxy resin, concrete strength, fiber properties and application method have an important role in bonding of FRP composites to concrete surfaces. In this study, concrete beam specimens were produced in order to investigate the adhesion of Basalt Fiber Reinforced Polymer (BFRP) composites to the concrete surface using conventional concretes. Stress distribution between concrete and BFRP was investigated by opening a gap in the bottom center of the samples. Unidirectional basalt fiber fabric was used in the production of the test specimens. The effects of concrete surface properties and U winding method on the end of fiber adhesion ability were investigated by bonding BFRP composite to the lower surfaces of the Specimens. Specimens were tested by four point bending experiment. According to the results obtained, the grinding of the concrete surface and the U-winding method significantly improve the adhesion.”

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Polikutin, A. E., A. V. Levchenko, and D. N. Korotkih. "Comparative analysis of the durability of normal sections reinforced rubber concrete with fiber and reinforced concrete bending elements." IOP Conference Series: Materials Science and Engineering 463 (December 31, 2018): 022040. http://dx.doi.org/10.1088/1757-899x/463/2/022040.

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Xu, Qin, Wei Huang, Hao Zhen Wu, Xiao Ping Jiang, and Zhen Zhong Zhang. "Finite Element Analysis of Concrete Beams Reinforced With Fiber Reinforcing Bars." Advanced Materials Research 243-249 (May 2011): 756–60. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.756.

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Based on bending fiber reinforced concrete beam, through the nonlinear analysis, the paper discuss the constitutive models of concrete and reinforcement, the properties of their element and the models of concrete beams reinforced with FRP bars. Using nonlinear analysis and comparing numerical results with experimental results, the fiber reinforced concrete beam bending terminal numerical model constructed in this paper can simulate the entire process of internal force and deformation of fiber reinforced concrete beams, and describe cracks in the formation and extension and the failure process and failure form, which also can provide enough precision to the practical engineering and scientific research. Meanwhile, the finite element computation model verified by test can provide more reactive information to effective structure computation model.

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SLAITAS, Justas, Zbynek HLAVAC, and Arnoldas ŠNEIDERIS. "FLEXURAL REINFORCED CONCRETE ELEMENTS NORMAL SECTION BEARING CAPACITY EVALUATION IN FRACTURE STAGE." Engineering Structures and Technologies 9, no. 2 (June 14, 2017): 70–78. http://dx.doi.org/10.3846/2029882x.2017.1322919.

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This article examines flexural reinforced concrete structures condition assessment process in existing buildings on the stage where the reinforcement stress is between the yield and the tensile strength. The research is made on V. Jokūbaitis proposed methodology directly measuring the compression zone height, allowing us to evaluate the behavior of reinforced concrete beam fracture sufficiently precisely. This paper confirms the hypothesis that, when reinforcement reaches yielding stress, elastic strain dominates in concrete‘s compression zone and it is reasonable to use triangular concrete compression zone diagram, without tensile concrete above crack evaluation. The methodology of reinforced concrete structures bearing capacity assessment according to limit normal section crack depth is proposed. There is established connection between bending moments, when reinforcement achieve yielding stress and tensile strength, which allows us to decide about structures bearing capacity reserve. The results are confirmed with experimental studies and calculated values obtained by methodologies based on different reduced stress diagrams of concrete‘s compressive zone.

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Vlach, Tomáš, Alexandru Chira, Lenka Laiblová, Ctislav Fiala, Magdaléna Novotná, and Petr Hájek. "Numerical Simulation of Cohesion Influence of Textile Reinforcement on Bending Performance of Plates Prepared from High Performance Concrete (HPC)." Advanced Materials Research 1106 (June 2015): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1106.69.

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Demand for very thin concrete elements, which can’t be reinforced with usually used steel reinforcement, gave rise to a new type of non-traditional reinforcement with technical textiles in matrix of epoxy resin. This type of reinforcement together with concrete is called textile reinforced concrete (TRC). Composite reinforcement is very chemically resistant, so the concrete cover is proposed to regard the durability. It allows a significant saving of concrete and design of thinner elements. For TRC structures is used high performance concrete (HPC) with its fine grained structure and high compressive strength. Textile reinforcement and TRC in general are developed at the Faculty of Civil Engineering and the Klokner Institute, CTU in Prague.

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Journal articles on the topic 'Bending reinforced concrete elements'

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