EXPERIMENTAL INVESTIGATION ON ASEISMIC BEHAVIOR OF DUAL STEEL HIGH STRENGTH CONCRETE SHEAR WALLS WITH HIGH AXIAL LOAD RATIO

In order to research the aseismic behavior of dual steel high strength concrete (DSHSC) shear walls, a quasi-static test for four specimens was carried out. The shear-span ratio of all specimens was 2.5. The failure mechanism, hysteretic behavior, deformability and energy dissipation capacity under a cyclic lateral load were analyzed by changing the space of binding bars and stiffeners. The results showed that two failure models of the wall were the buckling of the steel tube and the crash of core concrete at the base of the specimens. All of the DSHSC structural walls had plump hysteretic curves and no significant pinch phenomenon. The displacement ductility coefficient varied from 3.11 to 4.37. The equivalent viscous damping ratio ranged from 0.158 to 0.291. Both ductility coefficient and equivalent viscous damping ratio can satisfy requirements of aseismic design. Under same axial compression ratio, the specimens with stiffeners show a better aseismic performance than the ones with binding bars. The deformability of the specimen was significantly improved when the space of stiffeners and binding bars decreased, and the specimens showed a good energy dissipation capacity.