]>> 0000009956 00000 n ACI Struct J 1990;87(5):6671 [AmericanConcrete Institute, Detroit]. shear resisting mechanism is affected mainly by concrete strength, tension reinforcement ratio, effective depth, and shear span to depth ratio as shown in Fig. However, the combination of steel fibre reinforced concrete and conventional reinforcement has in many researches shown to emphasize good bearing capacity. In this study an experimental database of 113 RC slabs without shear reinforcement under punching loads was compiled using data available in the literature. Regarding the beams without web reinforcement, they observed that the use of high-strength concrete on the precast beam did not significantly increase the shear strength of the composite element, that a greater longitudinal reinforcement ratio increased the shear strength of the beams, and that the shear strength decreased with increasing the shear span-effective depth ratio. The interface shear strength of surface with and without the projecting steel reinforcement can be predicted using the Mohr-Coulomb failure envelope. The main variables were the longitudinal steel reinforcement ratio and the shear-span to effective depth ratio. The present paper deals with the shear behavior of high strength concrete beams with various shear span to depth ratio and volume fraction of fibers, without web reinforcement. 3. Marzouk H, Hussein A. Date: 5/31/2020. 2005b). Shear strength of fibre-reinforced polymer reinforced concrete deep beams without web reinforcement. 3. 0000001486 00000 n Twenty singly reinforced high strength concrete beams without web reinforcement were tested to investigate their behaviour and to determine their ultimate shear capacities. Copyright © 2021 Elsevier B.V. or its licensors or contributors. In contrast to existing methods, the new approach considers the fatigue degradation of shear capacity on the material level, taking into account the mechanical properties of concrete in detail, including the tensile strength, the fracture energy and the bond between concrete and reinforcement. Talbot [13] suggested that the shear strength of slender beams varies with the amount of tension reinforcement ratio as well as the compressive strength of the concrete (Fig. This paper examines the shear strength and behavior of concrete beams reinforced with basalt fiber-reinforced polymer (basalt FRP) bars with and without shear reinforcements. This paper summarizes results of an experimental program that examined the effect of concrete strength and a/d ratio on diagonal cracking shear strength and ultimate shear capacity of nine reinforced concrete beams without web reinforcement. 0000049002 00000 n shear strength is also dependent on the a/d ratio of the beam (Mphonde and Frantz 1984). Comparison between test results and theoretical shear capacity show that all of equations conservatively estimate the occurrence of shear failure with the values of the test results 10 to 90% higher than the theoretical values. The maximum shear stress associated the minimum strut angle of θ =21.8º (when cot θ = 2.5) is relatively high (e.g. 0000001227 00000 n Laws of mechanics and realistic physical quantities are consistently used in the model. The shear failure of concrete elements without shear reinforcement is directly related to the tensile strength of concrete, which is most often defined as a function of compressive strength. 0000006329 00000 n 1. 3.64 MPa for a C30/37 concrete). The contribution of shear reinforcement to shear resistance is typically modeled either with a 45 degree truss plus a concrete term, or a variable angle truss without a concrete term. The proposed model is shown to properly describe a large set of available test data. MS No. 103-S01 Reinforced Concrete Corbels—Shear Strength Model and Design Formula by Gaetano Russo, Raffaele Venir, Margherita Pauletta, and Giuliana Somma A new model for determining the shear strength of reinforced con- RESEARCH SIGNIFICANCE crete (RC) corbels, or brackets, is proposed in this paper. x�b```�=�,�� cc`a���p�a�)f���iZT3ZT�6 )d�(�X�`*Y& e�� Shear Reinforcement: In members with shear reinforcement, a large portion of the shear is carried by the shear reinforcement after diagonal cracking occurs. �=��tJ�lؔ��e�CC!������� �QH�,�l�с� �e`�X���X ,�� �0�!�qc�+������ ��V2 2mbZ���i6�B��\޽��ە�3�g�ƨ������@���T�'U��/ i& �bM&�^����-@� �eL7 2. cracking tensile strength of fiber-reinforced concrete. By continuing you agree to the use of cookies. In this study, five large-scale test beams were prepared by using eco-friendly high strength concrete (HSC) with and without steel fibers or shear reinforcement. The use of high strength concrete in major constructions has become obligatory, whose mechanical properties are still at a research phase. This paper also proposed design expressions for concrete-to-concrete bond on surfaces provided with and without projecting steel reinforcement that can be adopted in Eurocode 2. https://doi.org/10.1016/j.engstruct.2021.111886. Some codes also account for size effect, membrane effect, or the ratio of column size to the depth of the slab. However, the combination of steel fibre reinforced concrete and conventional reinforcement has in many researches shown to emphasize good bearing capacity. Ahmed K. El-Sayed, a Ehab F. El-Salakawy, b Brahim Benmokrane c. a Center of Excellence for Concrete Research and Testing, Department of Civil Engineering, King Saud University, P.O. 11.3) V c = 2 √f c’ (b w x d ) where f c’ is in psi; b w and d are in inches Section 1-1 d 1 d 1 V u 45 0 b w Fig. Talbot [13] suggested that the shear strength of slender beams varies with the amount of tension reinforcement ratio as well as the compressive strength of the concrete (Fig. Abstract: This study presents the shear capacity of eco‑friendly high‑strength concrete (HSC) beams reinforced by 0.75% (by volume) of hooked steel fibers or shear stirrups with various spacings. 0000088637 00000 n The calibration of most analytical models that assess the shear strength of wide reinforced concrete members without shear reinforcement is based on simply supported beam tests, which may not be representative of slabs and wide members failing in shear. The uniaxial compressive strength of concrete was about 93 MPa (13,500 psi). Box 800, Riyadh 11421, Kingdom of Saudi Arabia. A flat slab, without shear reinforcement, has a minimum punching shear strength vmin = 0.45 MPa and a maximum punching shear capacity VRd, max = 1518 kN. Compared to reinforced concrete (RC) beams without stirrup reinforcement, the use of hooked steel fibers in a volume fraction greater than or equal to 0.75% led to an enhanced inclined cracking pattern and a substantial increase in shear strength. All shear force is assumed to be resisted by a truss action. The hooked steel fiber with a fiber volume fraction of 0.75%, and shear reinforcement ratios of 0.0 (0.0d), 0.32 (0.25d), 0.21 (0.375d) and 0.16 (0.5d) were adopted. In a member with shear reinforcement, the shear strength of the beam is considered to be the sum of shear strength provided by the concrete and that attributable to the shear reinforcement. 2. In Eurocode 2, the punching strength is expressed via the function that is proportional to the cube root of the compressive 0000000876 00000 n Introduction Due to the complexity of the shear transfer mechanism, the shear strength of reinforced concrete (RC) members Their structural behavior is not straightforward and, specifically, punching shear strength is a current research topic. This study presents an investigation on the influence of beam depth and longitudinal reinforcement ratio on shear strength. The shear strength prediction model for fiber-reinforced polymer (FRP) bar-reinforced concrete beams without stirrups in ACI440.1R-2015 does not consider the “size effect” and the effect of shear span-to-depth ratio and predicts the zero-shear strength for concrete members without longitudinal reinforcement. The model is extensively verified using the results of shear tests published by other authors. In the present study, an experimental investigation of the steel fibers’ effect on the bending behavior of concrete beams is performed. In this thesis, two punching shear capacity models been analysedhave and adapted on 136 An evaluation of the experimental-to-calculated ratio Vexp/Vcal for a shear test database of 108 simply supported beams under concentrated loads using mSM-c yielded a mean value of 1.02 and a corresponding coefficient of variation of 11%, showing a notable improvement in prediction accuracy when compared to some existing shear models. Berlin Brigade Mcnair Barracks, Sandwich Glass - Wikipedia, Red Onion Tart, Craigslist Slidell Pets, Small Farms For Sale Near Cincinnati Ohio, Ark: Crystal Isles, Greek Gods And Goddesses List, " />
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effective depth of the slab. H�T�;o�0 ��_�U�@��z�0��B���P���}�@w�@�ωې��9 z�-&)4�˦9B��$!� &n���L�����9,P�����. Shear strength of RC beams without web reinforcement Tao Zhang, Phillip Visintin and Deric J. Oehlers school of civil, Environmental and Mining Engineering, the university of Adelaide, south Australia, Australia 1. Except for members designed in accordance with ACI 318 Appendix A 0 In regard to shear performance, limited studies currently exist. Test variables were longitudinal steel ratio (ρ), shear span to depth ratio (a/d) and effective depth (d). %%EOF 0000004327 00000 n 0000000016 00000 n Keywords: shear capacity, hooked steel fiber, stirrups, high‑strength concrete. The contribution of shear reinforcement to shear resistance is typically modeled either with a 45 degree truss plus a concrete term, or a variable angle truss without a concrete term. The shear failure of a concrete element without shear reinforcement is governed, among other factors, by the tensile strength of concre-te. For FRP bar reinforced concrete beams without stirrups and shear span-to-depth ratio of more than 2.7, a number of studies have shown that several parameters have the impacts on the shear strength [12–15], such as concrete cylinder compression strength (), beam width (), effective depth (), reinforcement ratio (), and modulus of elasticity of the longitudinal FRP bar. fiber shear strength of concrete increased upto a optimum limit. An improvement of the prediction accuracy compared to existing shear models is obtained. If v Ed > v Rd,cot q = 1.0 then a larger section or greater concrete strength is required. Their structural behavior is not straightforward and, specifically, punching shear strength is a current research topic. A method is recommended for the evaluation of shear strength which assumes that the shear carried by the concrete is equal to the shear causing significant inclined cracking, and that the shear carried by the web reinforcement is equal to the force in the web reinforcement which is crossed by an idealized inclined crack. Reinforced concrete (RC) slabs are characterized by reduced construction time, versatility, and easier space partitioning. 2.4K views In this thesis, two punching shear capacity models been analysedhave and adapted on 136 strength from concrete without shear reinforcement Vc plus the strength Vs provided by shear reinforcement. Research on shear behaviour and shear capacity of reinforced concrete members without shear reinforcement is always of particular interest, especially… Experimental results from tests on seven 650 mm deep large-scale reactive powder concrete (RPC) I-section girders failing in shear are reported herein. 0000003011 00000 n Shear strength of a slab that resists flexural forces in two orthogonal directions around a column (flat plates, footings and pile caps), is evaluated as the shear strength of a prism located at a The load from the slab on the column is VEd = 550 kN. In a member without shear reinforcement, shear is assumed to be resisted by the concrete web. 0000003913 00000 n In this chapter an experimental investigation is carried out on high strength concrete beams without transverse reinforcement and with transverse reinforcement. 0000005605 00000 n Among them, tensile strengt 0000002487 00000 n ��8��c"������SB��$R0r�}�%��$ Kim and Park [8] and Chandrasheker Rao et al [9] had predicted the shear strength of reinforced concrete beams without web reinforcement. Shear Strength of ”Concrete". Shear strength with shear reinforcement EC2 uses a method based on equilibrium truss model to design shear reinforcement. Six 200 × 300 mm ( 8 × 12 in. ) Shear strength of reinforcement, ϕV s ] ϕV n = ϕV c + ϕV s Therefore, V u ≤ [ ϕV c + ϕV s ] Shear force that concrete can resist without web reinforcement , V c (ACI Eq. In this paper, an extend formulation of this model, named mSM-c, for members under cyclic loads is presented. PROPOSED SHEAR DESIGN EQUATION An experimental study to investigate the shear strength of concrete beams without shear reinforcement (stirrups) and reinforced in the longitudinal direction with different types and ratios of FRP bars was carried out by the authors (El-Sayed et al. 0000003668 00000 n Size Effect on Punching Strength of Reinforced Concrete Slabs with and without Shear Reinforcement by Abdullah Dönmez and Zdeneˇk P. Bažant ACI Structural Journal, V. 114, No. ACI Struct J 1990;87(5):6671 [AmericanConcrete Institute, Detroit]. 0000088408 00000 n The stress distribution at failure and the failure modes of reinforced concrete beams with and without web reinforcement failing by shear-compression have been investigated. Currently, fiber reinforcement material appears as an effective way to enhance general concrete performance under diverse loads. 0000002077 00000 n Yun, H-D, You, Y-C, Lee, D-H (2011) Effects of replacement ratio of recycled coarse aggregate on the shear performance of reinforced concrete beams without shear reinforcement. The shear causing The girders were cast using 150-170 MPa steel fiber RPC and were designed to as- sess the capacity to carry shear stresses in thin webbed prestressed beams without shear reinforcement. 0000004251 00000 n Influence of Width-to-Effective Depth Ratio on Shear Strength of Reinforced Concrete Elements without Web Reinforcement It is well-known that the shear strength of reinforced concrete elements without web reinforcement is affected by different factors. Shear strength of fibre-reinforced polymer reinforced concrete deep beams without web reinforcement. The load from the slab on the column is VEd = 550 kN. Relationship of the punching shear capacity of reinforced concrete slabs with concrete strength. without shear reinforcement, shear is assumed to be resisted by the concrete web. Many existing studies on punching shear in a RC flat plate slab without shear reinforcement consider uncracked concrete in the compression zone or the aggregate interlock mechanism in the cracked tension zone as shear resistance to external shear forces. The slab is supported by a 400 mm square column, as shown below. This paper deals with the review of available data base and shear models to predict the shear strength of reinforced concrete beams without web reinforcement. The use of steel fibers is particularly attractive for high-strength concrete, which can be relatively brittle without fibers, or if conventional stirrups can be eliminated, which reduces reinforcement congestion. startxref This study presents an investigation on the influence of beam depth and longitudinal reinforcement ratio on shear strength. <<873F4FA26F6B184EA92AB4D4FC4D15BE>]>> 0000009956 00000 n ACI Struct J 1990;87(5):6671 [AmericanConcrete Institute, Detroit]. shear resisting mechanism is affected mainly by concrete strength, tension reinforcement ratio, effective depth, and shear span to depth ratio as shown in Fig. However, the combination of steel fibre reinforced concrete and conventional reinforcement has in many researches shown to emphasize good bearing capacity. In this study an experimental database of 113 RC slabs without shear reinforcement under punching loads was compiled using data available in the literature. Regarding the beams without web reinforcement, they observed that the use of high-strength concrete on the precast beam did not significantly increase the shear strength of the composite element, that a greater longitudinal reinforcement ratio increased the shear strength of the beams, and that the shear strength decreased with increasing the shear span-effective depth ratio. The interface shear strength of surface with and without the projecting steel reinforcement can be predicted using the Mohr-Coulomb failure envelope. The main variables were the longitudinal steel reinforcement ratio and the shear-span to effective depth ratio. The present paper deals with the shear behavior of high strength concrete beams with various shear span to depth ratio and volume fraction of fibers, without web reinforcement. 3. Marzouk H, Hussein A. Date: 5/31/2020. 2005b). Shear strength of fibre-reinforced polymer reinforced concrete deep beams without web reinforcement. 3. 0000001486 00000 n Twenty singly reinforced high strength concrete beams without web reinforcement were tested to investigate their behaviour and to determine their ultimate shear capacities. Copyright © 2021 Elsevier B.V. or its licensors or contributors. In contrast to existing methods, the new approach considers the fatigue degradation of shear capacity on the material level, taking into account the mechanical properties of concrete in detail, including the tensile strength, the fracture energy and the bond between concrete and reinforcement. Talbot [13] suggested that the shear strength of slender beams varies with the amount of tension reinforcement ratio as well as the compressive strength of the concrete (Fig. This paper examines the shear strength and behavior of concrete beams reinforced with basalt fiber-reinforced polymer (basalt FRP) bars with and without shear reinforcements. This paper summarizes results of an experimental program that examined the effect of concrete strength and a/d ratio on diagonal cracking shear strength and ultimate shear capacity of nine reinforced concrete beams without web reinforcement. 0000049002 00000 n shear strength is also dependent on the a/d ratio of the beam (Mphonde and Frantz 1984). Comparison between test results and theoretical shear capacity show that all of equations conservatively estimate the occurrence of shear failure with the values of the test results 10 to 90% higher than the theoretical values. The maximum shear stress associated the minimum strut angle of θ =21.8º (when cot θ = 2.5) is relatively high (e.g. 0000001227 00000 n Laws of mechanics and realistic physical quantities are consistently used in the model. The shear failure of concrete elements without shear reinforcement is directly related to the tensile strength of concrete, which is most often defined as a function of compressive strength. 0000006329 00000 n 1. 3.64 MPa for a C30/37 concrete). The contribution of shear reinforcement to shear resistance is typically modeled either with a 45 degree truss plus a concrete term, or a variable angle truss without a concrete term. The proposed model is shown to properly describe a large set of available test data. MS No. 103-S01 Reinforced Concrete Corbels—Shear Strength Model and Design Formula by Gaetano Russo, Raffaele Venir, Margherita Pauletta, and Giuliana Somma A new model for determining the shear strength of reinforced con- RESEARCH SIGNIFICANCE crete (RC) corbels, or brackets, is proposed in this paper. x�b```�=�,�� cc`a���p�a�)f���iZT3ZT�6 )d�(�X�`*Y& e�� Shear Reinforcement: In members with shear reinforcement, a large portion of the shear is carried by the shear reinforcement after diagonal cracking occurs. �=��tJ�lؔ��e�CC!������� �QH�,�l�с� �e`�X���X ,�� �0�!�qc�+������ ��V2 2mbZ���i6�B��\޽��ە�3�g�ƨ������@���T�'U��/ i& �bM&�^����-@� �eL7 2. cracking tensile strength of fiber-reinforced concrete. By continuing you agree to the use of cookies. In this study, five large-scale test beams were prepared by using eco-friendly high strength concrete (HSC) with and without steel fibers or shear reinforcement. The use of high strength concrete in major constructions has become obligatory, whose mechanical properties are still at a research phase. This paper also proposed design expressions for concrete-to-concrete bond on surfaces provided with and without projecting steel reinforcement that can be adopted in Eurocode 2. https://doi.org/10.1016/j.engstruct.2021.111886. Some codes also account for size effect, membrane effect, or the ratio of column size to the depth of the slab. However, the combination of steel fibre reinforced concrete and conventional reinforcement has in many researches shown to emphasize good bearing capacity. Ahmed K. El-Sayed, a Ehab F. El-Salakawy, b Brahim Benmokrane c. a Center of Excellence for Concrete Research and Testing, Department of Civil Engineering, King Saud University, P.O. 11.3) V c = 2 √f c’ (b w x d ) where f c’ is in psi; b w and d are in inches Section 1-1 d 1 d 1 V u 45 0 b w Fig. Talbot [13] suggested that the shear strength of slender beams varies with the amount of tension reinforcement ratio as well as the compressive strength of the concrete (Fig. Abstract: This study presents the shear capacity of eco‑friendly high‑strength concrete (HSC) beams reinforced by 0.75% (by volume) of hooked steel fibers or shear stirrups with various spacings. 0000088637 00000 n The calibration of most analytical models that assess the shear strength of wide reinforced concrete members without shear reinforcement is based on simply supported beam tests, which may not be representative of slabs and wide members failing in shear. The uniaxial compressive strength of concrete was about 93 MPa (13,500 psi). Box 800, Riyadh 11421, Kingdom of Saudi Arabia. A flat slab, without shear reinforcement, has a minimum punching shear strength vmin = 0.45 MPa and a maximum punching shear capacity VRd, max = 1518 kN. Compared to reinforced concrete (RC) beams without stirrup reinforcement, the use of hooked steel fibers in a volume fraction greater than or equal to 0.75% led to an enhanced inclined cracking pattern and a substantial increase in shear strength. All shear force is assumed to be resisted by a truss action. The hooked steel fiber with a fiber volume fraction of 0.75%, and shear reinforcement ratios of 0.0 (0.0d), 0.32 (0.25d), 0.21 (0.375d) and 0.16 (0.5d) were adopted. In a member with shear reinforcement, the shear strength of the beam is considered to be the sum of shear strength provided by the concrete and that attributable to the shear reinforcement. 2. In Eurocode 2, the punching strength is expressed via the function that is proportional to the cube root of the compressive 0000000876 00000 n Introduction Due to the complexity of the shear transfer mechanism, the shear strength of reinforced concrete (RC) members Their structural behavior is not straightforward and, specifically, punching shear strength is a current research topic. This study presents an investigation on the influence of beam depth and longitudinal reinforcement ratio on shear strength. The shear strength prediction model for fiber-reinforced polymer (FRP) bar-reinforced concrete beams without stirrups in ACI440.1R-2015 does not consider the “size effect” and the effect of shear span-to-depth ratio and predicts the zero-shear strength for concrete members without longitudinal reinforcement. The model is extensively verified using the results of shear tests published by other authors. In the present study, an experimental investigation of the steel fibers’ effect on the bending behavior of concrete beams is performed. In this thesis, two punching shear capacity models been analysedhave and adapted on 136 An evaluation of the experimental-to-calculated ratio Vexp/Vcal for a shear test database of 108 simply supported beams under concentrated loads using mSM-c yielded a mean value of 1.02 and a corresponding coefficient of variation of 11%, showing a notable improvement in prediction accuracy when compared to some existing shear models.

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