Analysis on the seismic performance of improved design on FRC diagonally reinforced coupling beams

摘要

Uniaxial tensile strain of FRC is 100-300 times of that of the ordinary concrete, with tensile strain hardening behavior. The experiment study showed that if FRC was used to replace ordinary concrete as the diagonal reinforcement small span-depth ratio coupling beam matrix, it can improve the ductility and energy dissipation capacity of small span-depth ratio beams, reduce the amount of steel. On the basis of experimental study, the FRC beam finite element model was established based on ABAQUS finite element software. Based on experimental study of FRC beams, by using unbonded technique, the improved reinforcement scheme of sleeve PVC casing in the length range of 1/4 beam height of FRC bearing capacity of longitudinal reinforcement near the wall was proposed, and by using the established numerical model, the superiority of the improved design scheme was discussed. The results showed that the improved design scheme had better bearing capacity, ductility and energy dissipation capacity compared with the original scheme.