Evaluating the Predicted Shear Strength of Concrete Deep Beams Reinforced with FRP Bars with/without Fibrous Concrete
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Abstract
One of the typical and significant components of large structural superstructures, such as offshore structures, bridges, and large multistory buildings, is the reinforced concrete deep beam. A deep beam is mostly used to transfer load foundations, girders, bending and pile caps, and some walls. Numerous studies have been done on the deep beams’ behavior under stresses because of the significance of deep beams. Even there are specifications for fiber-reinforced Polymers (FRP) reinforced deep beam in some codes, along with suggestions for the method prediction of load failure, strut-tie method (STM) method, included in most codes. It should be noted that many studies are still re-evaluating the factors utilized in the analysis method. The paper offers deep beam analysis methods of the shear models proposed by the codes and searcher for some published research. The survey database of 120 FRP-reinforced deep beams tested in shear was used to conduct the study. All specimens simply supported beams under three or four points load and rectangular cross-section. The specimens studied included different web shear reinforcement (horizontal and vertical), compressive strength, shear span-to-depth ratio a/d, and fiber volume fraction. Models combining steel and FRP reinforcement were excluded. The models predicting the shear capacity of FRP reinforced deep beams evaluated in this study were STM of CSA S806-12, Shear capacity V_c of ACI 440-11-22 and CSA S806-12, Zhang et al. [31] model, and Nehdi et al. [32] model. The models predicting the shear capacity of FRP reinforced deep beam evaluated in this study were either unsafe or inaccurate. The shear strength prediction of STM CSA S806 was most appropriate; however, it is conservative, making it uneconomical. Zhang et al. [31] presented a shear strength prediction model for FRP-reinforced deep beams without web reinforcement. No method is recommended for calculating the effect of fiber volume fraction on the shear capacity of FRP-reinforced concrete deep beams.
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