两边连接薄钢板剪力墙加固损伤RC框架结构抗震性能

Seismic behavior of damaged RC frames strengthened by thin steel plate shear walls with two sides connected

为了提高损伤RC框架的抗震性能,采用两边连接薄钢板剪力墙对其进行加固。通过2个1/3缩尺比单跨2层两边连接薄钢板加固损伤RC框架的低周往复加载试验,对其抗震性能进行了研究,并与未损伤RC框架试验结果进行对比分析。结果表明:设置两边连接钢板剪力墙,可显著提高损伤RC框架的承载力、抗侧刚度和延性;加固后的结构钢板剪力墙屈服在先,框架破坏在后,符合"强框架弱钢板"抗震要求。采用有限元软件SAP2000对试验加固框架受力性能进行了非线性分析,与试验结果的对比表明,计算分析结果与试验结果吻合较好,所建立的拉压杆有限元模型可用于该类结构的非线性分析。

In order to improve the seismic performance of damaged RC frame structures,the thin steel plate shear walls connected with beams only(SPSWCB)are used to strengthen the damaged RC frame structures.To evaluate the seismic behavior of this structure,two one-bay,two-story,and one-third scale specimens were tested under low-cycle reversed loading and compared with an undamaged RC frame.The test results show that the load-bearing capacity,the lateral stiffness and ductility are improved greatly by adopting the SPSWCB.The strengthened structure has a reasonable yielding mechanism of which the steel plate shear wall yields first and subsequent the frame cracks occur,which conforms to the seismic performance requirement of‘strong frame,weak steel plate’.The finite element software SAP2000 was adopted to conduct nonlienar simulation of strenghthened specimen.The comparison shows that the finite element simulation results using SAP2000 agreed well with the test results,and the finite element model can be used for the nonlinear analysis of such structures.