钢网格剪力墙力学性能试验研究及有限元分析

Experimental study and finite element analysis of grid-shaped steel plate shear wall

为解决现有加劲钢板剪力墙现场安装难度高、焊接工作量大等问题,提出了装配式钢网格剪力墙结构。为考察该抗侧力体系的静力性能和抗震性能,对2个缩尺模型进行了单调水平加载和低周往复加载试验。基于ABAQUS建立有限元分析模型,验证钢网格剪力墙有限元模型的准确性。研究结果表明:在单调荷载或低周往复荷载作用下,试验与有限元分析结果较为一致,试件均表现出良好的抗侧刚度、延性和耗能能力;其破坏过程为中间位置的T形钢构件首先出现全截面屈服,随着位移荷载的增大,靠近梁柱节点位置的较短T形钢构件开始局部屈服,最终所有T形钢构件均达到了全截面屈服,试件破坏形式为中部T形钢构件拉断,失效模式较为合理;试件破坏时的层间位移角均达到了3.6%以上,延性系数达到5.35以上,试件在每级荷载循环后的强度退化系数均在0.92以上,受力性能稳定。

An innovative fabricated grid-shaped steel plate shear wall(GSPSW)was proposed to solve the problems of difficult on-site installation and heavy welding workload of existing stiffened steel plate shear walls.Monotonic and cyclic loading tests on two scaled specimens were conducted to investigate the static and seismic performance of this innovative lateral force-resisting system.The finite element analysis(FEA)model of the GSPSW based on ABAQUS was established and verified by test results.The analysis results show that the FEA models of GSPSW can simulate the behaviour of the specimens well under static and quasi-static loads,and the specimens show good lateral stiffness,ductility and energy dissipation capacity.The failure process is that the T-beam members in the middle position first appears local yielding,with the increase of lateral displacement,the shorter T-beam members near the joints of the beam-column begin to full section yielding.Finally,all T-shaped steel members yield at the end of the test.The failure mode of the specimen is the destruction of the middle T-shaped steel member,which is a reasonable structural failure mode.The inter-story drifts and the ductility coefficients of the specimens reach more than 3.6%and 5.35,respectively.The strength degradation coefficients of the seismic specimen after each load cycle are above 0.92,indicating that the mechanical performance of the specimens is stable.