方钢管混凝土框架-十字加劲薄钢板剪力墙抗震性能试验研究

对3个单跨两层1∶3比例的方钢管混凝土框架-薄钢板剪力墙试件进行了低周反复荷载试验,研究了十字加劲薄钢板剪力墙的抗震性能,并与方钢管混凝土框架-非加劲薄钢板剪力墙比较。对比了框架梁柱内隔板式节点与穿芯高强螺栓-端板节点对结构性能的影响。得到了方钢管混凝土框架-薄钢板剪力墙的破坏形态、荷载-位移滞回曲线、骨架曲线、特征荷载和位移及抗震性能指标等,分析了结构的破坏特征、延性、耗能能力、承载能力及刚度退化等力学性能。结果表明,方钢管混凝土框架-薄钢板剪力墙具有良好的抗震性能;十字加劲肋限制了薄钢板剪力墙的面外变形,提高了其承载力与耗能能力,但对整体刚度影响较小;穿芯高强螺栓-端板节点提高了结构的承载力与刚度。

Experimental study on seismic behavior of concrete-filled square steel tubular frame-thin steel plate shear walls with cross stiffeners

In this study, low cyclic loading tests were conducted on three 1/3-scale single-span two-floors test models designed with thin steel plate shear walls (SPSWs) and concrete-filled square steel tubular frames. The seismic behavior of SPSWs with cross stiffeners was studied and compared with that of unstiffened SPSWs. A comparison between inner diaphragm connection and core-through high-strength bolts-endplate connection was conducted for their influences on the structural performance. The failure pattern, load-displacement hysteretic curves, skeleton curves, characteristic load, characteristic displacement, and seismic performance indexes were obtained. Furthermore, the failure characteristics, ductility, energy dissipation capacity, load carrying capacity and stiffness degeneration were studied. Experimental results show that the concrete-filled square steel tubular frame-thin steel plate shear walls possess favorable seismic performance. The cross stiffeners can restrict the out-of-plane deflection of SPSWs and improve their bearing capacity and energy dissipation capacity, but have little effect on the overall stiffness. The core-through high-strength bolts-endplate connection can enhance the load carrying capacity and stiffness of structures.