竖向波形钢板-混凝土组合剪力墙的抗震韧性试验研究

为了克服传统剪力墙的不利受损形态,提升剪力墙的抗震韧性,设计了方钢管混凝土作为边缘约束构件的竖向波形钢板-混凝土组合剪力墙CPCSW,并进行了拟静力试验,在罕遇地震作用下剪力墙层间位移角达到弹塑性层间位移角规范限值时,该剪力墙满足相关规范的抗震要求且克服了剪力墙墙身剪切开裂及墙趾压溃的震害,但边缘约束构件下部拉应力较大...

Experimental study on earthquake resilience of vertical corrugated steel plate-concrete composite shear walls

To overcome the adverse damage form of the traditional shear wall and improve the earthquake resilience of the shear wall, a vertical corrugated steel-concrete composite shear wall (CPCSW) was designed with the concrete filled square steel tube as the edge constraint member, and the quasi-static test was carried out. When the standard limit of the elasto-plastic inter-story drift ratio was reached under the action of a rare earthquake, the shear wall met the seismic requirements of relevant codes and overcame the seismic damage caused by shear cracking and the corners of the wall collapse, while the tensile stress at the bottom of the edge constrained member was large. Then, a tension-compression type replaceable corrugated steel plate damper with matching stiffness was installed at the corner of the CPCSW, and a replaceable corrugated steel composite shear wall (RCPCSW) was obtained. The seismic performance test of the RCPCSW under rare earthquakes was carried out, the result indicated that RCPCSW could reduce the stress of shear wall under the condition that the carrying capacity and stiffness were not decreased much, the plastic strain could be concentrated on the energy dissipating web of the replaceable damper. Subsequently, the damaged damper of RCPCSW was replaced and reloaded until the RCPCSW was damaged. The results showed that the seismic behavior curves of RCPCSW were basically consistent with the initial loading, indicating that the seismic performance of RCPCSW could be quickly recovered by replacing the corner dampers after a rare earthquake. The finite element software ABAQUS was used to simulate the test process, and the skeleton curve was close to the test results, indicating that the finite element model has a certain reliability. The results of von Mises stress cloud diagram and PEMAG equivalent plastic strain cloud diagram indicated that the replaceable dampers could concentrate stress and plastic strain, reduced the damage of the main structure, so that the main structure could maintain normal working condition after several earthquakes in a low-damage state, and improved the seismic resilience of the main structure.