Shear strength calculating model of FRP bar reinforced concrete beams without stirrups

摘要

The models in ACI 440.1R-15, AASHTO LRFD-17, CSA S806-12, CSA S6-14, ISIS M03-07, JSCE-97, CNR DT203-06 and BISE-99 did not properly reflect the effects of the reinforcement ratio and modulus of elasticity of the longitudinal fiber reinforced polymer (FRP) bars, shear span-to-depth ratio or size effect on the shear strength of FRP bar reinforced concrete beams without stirrups. A database of 389 FRP bar reinforced concrete beams without stirrups failed in shear was collected lately, and a new model was proposed to calculate the shear strength based on the experimental data of 188 beams in the database, whose variables are reinforcement ratio and modulus of elasticity of the longitudinal FRP bars, shear span-to-depth ratio, or the effective depth of the beams. The efficiency of the proposed model has been evaluated by comparing the calculated shear strength with the experimental data of another 201 beams in the database. It indicated the calculated shear strength values using the proposed model are more consistent with the experimental results compared to those using the models in existing design codes.