蝴蝶形钢板墙-钢框架自复位结构体系抗震性能试验研究

Experimental study on seismic performance of self-centering steel frame infilled with butterfly-shaped steel plate wall

为进一步研究蝴蝶形钢板墙-钢框架自复位结构体系的抗震性能,考虑蝴蝶板厚度对复位性能及耗能能力的影响,设计了2榀足尺不同厚度蝴蝶形钢板墙的自复位结构试件,并进行低周往复加载试验。根据试验实测数据,对试件的初始弹性抗侧刚度、滞回性能、承载力、耗能能力和复位能力等进行分析。结果表明:蝴蝶形钢板墙-钢框架自复位结构体系能够有效实现自复位功效与耗能能力的协调统一;较厚的蝴蝶钢板通过反向加载提高其抗压强度进而制约相应试件复位性能;两试件层间位移角在达到2%时,残余层间位移角随着厚度递增有所增加,除试件SC-6(6 mm蝴蝶板自复位结构试件)拉向卸载方向外,其余卸载方向残余位移角均小于0.5%,达到中震可修要求,同时大大降低修复难度;当试件层间位移角达到3%时,两试件残余层间位移角较上一级仅略微增加,且试件承载力均处于上升阶段,表明该结构在罕遇地震下依然能够有效控制残余变形且具备抗倒塌性能。

To further investigate seismic performance of self-centering steel frame infilled with butterfly-shaped steel plate wall, two full scale specimens with different plate thickness were designed and tested under quasi-static cyclic loading protocol. According to the measured test data, the specimens’ initial elastic lateral stiffness, hysteretic behavior, loading-carry capacity, energy-dissipation ability and self-centering function were studied. The results showed that the self-centering steel frame infilled with butterfly-shaped steel plate wall can effectively realize concordance and unification between self-centering function and energy-dissipation capacity;through reverse loading, the anti-compression strength of the thicker steel plate is increased and the plate restricts the system’s reset function;when two specimens’ story drift angles reach 2%, their residual story drift angles increase with increase in plate thickness, but they are less than 0.5% except the specimen SC-6 being pulled in unloading direction, tow specimens meet repairable requirement under moderate earthquake and the difficulty of repair is greatly reduced;when two specimens’ story drift angles reach 3%, their residual story drift angles slightly increase, and their load-bearing capacity also rises, so this structure can effectively control residual deformation, and have the anti-collapse capacity under rare earthquakes.