Anti-seismic test on concrete-filled square steel tube column

To study the anti-seismic performance of the concrete-filled square steel tube columns(CFSSTCs),a quasi-static test under the low-frequency cyclic load was designed and carried out.The bearing capacity,the deformability,the rigidity decay,the energy dissipation ability and the failure pattern of the CFFSSTCs under the lateral seismic load were investigated.The displacement ductility of the CFSSTC specimens were analyzed,the effects of the steel ratio,the slenderness ratio,and the axial compression ratio on the ductility of the CFSSTCs were studied.The results show that the most remarkable factor is the slenderness ratio,the axial compression ratio takes second place and the steel ratio is third.The test data provide a reference for the anti-seismic design of the CFSSTCs.