STUDY ON SEISMIC BEHAVIOR OF MID-RISE RC COMPOSITE SHEAR WALLS WITH CONCEALED TRUSS UNDER HIGH AXIAL COMPRESSION

The axial compression ratio has always been a vital element in shear wall seismic design. The experimental study on the seismic behavior of five 1/3 scale mid-rise shear walls with high axial compression ratio were carried out, including a plain shear wall, a shear wall with steel frame, a shear wall with steel bar truss, a shear wall with both steel frame and steel bar truss, and a shear wall with steel truss. For each shear wall, this paper analyzed experimentally the load-carrying capacity, the stiffness and its attenuation, ductility, hysteretic property, energy dissipation and failure pattern. And the formulas of load-carrying capacity were established, whose results were in good agreement with the test results. The experimental results showed that the seismic behavior of the shear wall was improved by the embedded steel frame or truss.