SHEAR DESIGN OF REINFORCED CONCRETE BEAMS WITH SHEAR REINFORCEMENT CONSIDERING FAILURE MODES

A shear design method considering failure modes is proposed for reinforced concrete (RC) beams with shear reinforcement. The proposed equation is capable of predicting the shear strength of RC beams based on two shear failure modes. These failure modes are shear failure after yielding of shear reinforcement (STF) and concrete crushing failure before yielding of shear reinforcement (SCF), which can be determined as a function of material properties of RC beams. In calculating the shear strength of the beams failing in STF mode, the strain hardening effect of steel is considered. For the beams failing in SCF mode, the real yield stress of steel, commonly used in calculating the shear strength provided by transverse steel in the current shear design procedures, is replaced by the stress of the shear reinforcement at shear strength. Calculated shear strength by the proposed equation is compared with experimental results and is shown to be in good agreement.