Seismic performance of grid tubular-double steel plate concrete composite shear wall

Abstract

Experimental study and numerical analysis on the seismic performance of grid tubular-double steel plate (GDSP) concrete composite shear wall subjected to low reversed cyclic loading were carried out in this paper. The effects of axial compression ratio, shear-span ratio, ending-configuration, strength of steel and concrete, length-to-width ratio and aspect ratio of cavity on the seismic performance of GDSP concrete composite shear wall, in terms of hysteresis curve, skeleton curve and failure mode, were investigated. The results show that the GDSP concrete composite shear wall exhibits excellent seismic performance with plump hysteresis curve, high bearing capacity and ductility. With the increase of axial compression ratio, the peak load of GDSP concrete composite shear wall increases, but the ductility decreases gradually. The numerical analysis results are consistent with the results tested. The infilled-concrete is confined by steel plates in three directions, and concrete compressive strength and ductility are significantly enhanced. The concrete sustains the compression together with steel plate, which prevents the outer double steel plate from buckling failure under compression. The length-width ratio of cavity affects the three-dimensional confine effect of the infilled-concrete. It is recommended that the length-width ratio of the end cavity take between 1.0–1.5 and the length to width ratio of the middle cavity set as 1.5–2.0. The single channel steel set at the side of the wall can significantly enhance the bearing capacity and deformation capacity.