Abstract
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. A modified shear strength prediction model for FRP bar-reinforced concrete beams without stirrups was presented in this paper. The proposed model takes into account the effect of concrete strength, size of the beam, shear span-to-depth ratio, reinforcement ratio, and modulus of elasticity of the longitudinal reinforcement and the “size effect.” The superiority of the proposed model has been evaluated by comparing the calculated shear strength of FRP bar-reinforced concrete beams without stirrups by the proposed model with the experimental results and calculated values by the models in design codes, respectively. It confirmed that the shear strength of FRP bar-reinforced concrete beams without stirrups by the proposed model was in better agreement with the experimental results.
Highlights
Fiber-reinforced polymer (FRP) bars have gained the acceptance as an alternative to conventional steel bars for concrete structures due to their corrosion resistance, high strength-to-weight ratio, and magnetic neutrality
While FRP bars have two drawbacks including brittle failure and low modulus of elasticity compared with the steel bars, the shear behavior of concrete beams reinforced with the FRP bar is different from those reinforced with similar amount of steel reinforcement [1,2,3,4]
The ACI440.1R-2015 model did not take into account the effect of concrete in the tensile zone of the beam on the shear strength for FRP bar-reinforced concrete beams without longitudinal reinforcement and Mathematical Problems in Engineering predicted the zero-shear strength for concrete beams without longitudinal reinforcement [8]. irdly, the ACI440.1R-15 model did not take into account the “size effect” [14,15,16,17] which explains the phenomenon that the normalized shear strength of FRP bar-reinforced concrete beams decreases with the increasing of beam depth
Summary
Fiber-reinforced polymer (FRP) bars have gained the acceptance as an alternative to conventional steel bars for concrete structures due to their corrosion resistance, high strength-to-weight ratio, and magnetic neutrality. Irdly, the ACI440.1R-15 model did not take into account the “size effect” [14,15,16,17] which explains the phenomenon that the normalized shear strength of FRP bar-reinforced concrete beams decreases with the increasing of beam depth. Us, there is a need to develop a modified shear strength prediction model for properly reflecting the effects of important parameters, which are known to affect the shear strength of FRP barreinforced beams without stirrups. Considering the effects of a/d on the shear strength of FRP bar-reinforced concrete beams without stirrups and the “size effect” and the contribution of the concrete to the shear strength for concrete beams without longitudinal reinforcement, a more accurate and rational-modified prediction model was proposed based on the ACI440.1R-2015 model. Considering the effects of a/d on the shear strength of FRP bar-reinforced concrete beams without stirrups and the “size effect” and the contribution of the concrete to the shear strength for concrete beams without longitudinal reinforcement, a more accurate and rational-modified prediction model was proposed based on the ACI440.1R-2015 model. e efficiencies of the proposed model and ACI440.1R-2015, CAN/CSA-S806-2012 [19], JSCE-1997 [20], AASHTO LRFD-2017 [21], and CNRDT203-2006 [22] models were evaluated by comparing the calculated values with the experimental values in the database and the test data which are not contained in the database
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