SEISMIC CHARACTERISTICS OF HYBRID FRP-STEEL-REINFORCED CONCRETEL SHEAR WALLS SUBJECTED TO CYCLIC LOADS

Shear walls are main lateral resistance members of high-rise and super-high-rise buildings, which are very important to the seismic performances of building structures. The pseudo-static analysis of seven hybrid FRP-steel-reinforced concrete shear walls with axial compression ratios of 0.2, 0.3 and 0.4 were simulated by finite element analysis software ABAQUS. The effects of axial compression ratios and mechanical properties of FRP bars on hysteretic properties, skeleton curves, seismic characteristics and residual deformation of shear walls were studied. The damage development characteristics of shear walls were compared and analyzed. The results showed that the longitudinal reinforcement in the edge members of RC shear walls with FRP bars could effectively decrease the residual deformation of shear walls, improve the ductility of the shear wall, and promote the joint work of reinforcement bars and concrete. The higher the strength or elastic modulus of FRP bars was, the more obvious the effect was, but the lower the energy consumption capacity of walls ware. With the increase of the axial compression, the ultimate bearing capacity of shear walls with FRP bars gradually increased, and the ultimate lateral displacement gradually increased when the axial compression ratios were less than 0.3, the adverse effect of the axial compression ratio on residual deformation of walls were small, and when axial compression ratios were greater than 0.3, the adverse effect of the axial compression ratio on residual deformation of walls increased sharply.