STUDY ON ASEISMIC PERFORMANCE OF A MULTI-RIBBED COMPOSITE WALL UNDER PSEUDO-DYNAMIC TEST

A multi-ribbed composite wall is the main member to bear forces in MRSS (multi-ribbed slab structure), whose aseismic performance and dynamical characteristics are the key points needed by computational theory of MRSS. Based on the test of a multi-ribbed composite wall under pseudo-dynamic force, its main failure modes and its main failure processes are studied; its dynamic response, hysteretic curves and outlining curves are analyzed; its restoring force mode is put forward; at last, its damage level under earthquake with different acceleration peak values is evaluated. According to the theoretical analysis and the test results, it can be concluded that the filled blocks, ribbed grids and outer frames of the wall are devoted to resist lateral load in turn at elastic stage, elastic-plastic stage and failure stage, which makes it to possess several aseismic defending lines; the wall is provided with steady lateral bearing capacity and better energy dissipation ability after small earthquake or medium earthquake, and the wall is provided with better anti-collapse performance after big earthquake; a retrogressive qua-linear restoring force model for the multi-rib composite wall is presented; its failure parameters can be used to evaluate its damage level under earthquake.