Research on effect of axial compression ratio on steel plate concrete composite shear walls

Abstract

Axial compression ratio is closely related to the seismic behavior of steel plate concrete composite shear walls(SPCW). Effects of axial compression ratio on the lateral stiffness, hysteretic behavior, energy dissipation capacity, ductility and bearing capacity of SPCW were analyzed by elasto-plastic finite element software. The results show that SPCW normal section bearing capacity changes along with axial compression ratio and reaches the maximum when the axial compression ratio is 0.4. SPCW has the maximum ductility and energy dissipation capacity when the axial compression ratio is in the range of 0.2 to 0.4. The deformation capacity, ductility and energy dissipation capacity decrease if the axial compression ratio exceeds 0.6. Meanwhile, axial compression ratio influences the initial lateral stiffness of SPCW. Lateral stiffness decreases with the cycles of reversed loading. To verify the reliability of the finite element analysis, a scaled compression-bending SPCW specimen test was carried out. The finite element analysis results agree well with the test results. While the normal section bearing capacities calculated by formula of JGJ 138-2012 'the code for design of composite structure' and the fiber finite element model are conservative. In order to ensure good seismic behaviors of SPCW, the axial compression ratio should not be too high.