EXPERIMENTAL RESEARCH ON SEISMIC PERFORMANCE OF PREFABRICATED SHEAR WALL WITH CONCRETE FILLED STEEL TUBE FRAME UNDER RAPID RECIPROCATING LOAD

In order to study the seismic performance of prefabricated shear wall with concrete filled steel tube frame under the rapid reciprocating load, three full-scaled single-layer single-span precast concrete-filled steel tube frame shear wall specimens were designed and fabricated. The reciprocating loading tests were carried out under the loading rates of 0.1, 5, 20 mm/s respectively, and the failure modes, hysteresis curve, skeleton curve, bearing capacity, ductility index, energy dissipation capacity and stiffness degradation were analyzed. The test results showed that all specimens were broken by concrete collapse at the bottom corner after the frame steel tube yielding, while the joints of steel bar and steel tube did not deform significantly, indicating that the sleeve grouting connection technology could meet the stress requirements of the prefabricated structures. The loading rate had limited impact on the seismic performance of prefabricated shear wall with concrete filled steel tube frame. When the loading rate was 200 times higher than the static loading rate, the bearing capacity of the shear wall increased by 6%, the ductility index decreased by 20%, and the equivalent viscous damping coefficient decreased by 13.1%.