EXPERIMENTAL RESEARCH ON SEISMIC BEHAVIORS OF PREFABRICATED SRCT SHEAR WALLS WITH DIFFERENT DISTANCE TO THICKNESS RATIOS

In order to study the seismic behavior of prefabricated SRC composite tube (SRCT) shear wall structures, a full-scale model quasi-static test of three prefabricated SRCT shear wall specimens was conducted. The performance of the specimens was evaluated in terms of cracking and failure mode, hysteretic curves, displacement ductility, stiffness degradation and energy dissipation capacity, et al. The results revealed that during the loading process, the concrete and the steel plate cooperated well, and the material function of each part was clear, showing a good overall load performance. SRCT shear wall had high bearing capacity and stiffness, which could meet the aseismatic fortification target of "no collapse under severe earthqnake". The hysteresis curve of the specimen was full, and the displacement ductility coefficient was about 3, showing a good plastic deformation performance and energy dissipation capacity. The distance to thickness ratio had little effect on the bearing capacity and energy dissipation capacity. With the decrease of distance to thickness ratio, the stiffness degraded faster and the ductility decreased slightly. With the decrease of distance to thickness ratio, the tear plate was not easy to buckle, and the internal failure modes changed from local buckling and fracture of U-shaped steel and steel plates to fracture of welds. Reliable measures should be taken to improve the bearing capacity and welding quality of thin steel plate to avoid welding damage. Other connection methods such as bolt connection could also be used.