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高强钢组合偏心支撑钢框架是一种耗能梁段采用屈服点较低的钢材(Q235,Q345),其他构件采用高强度钢材(Q460,Q690)的新型结构体系。为研究其抗震性能,对4个1∶2缩尺的单层单跨高强钢组合K形偏心支撑钢框架平面试件进行了单调加载试验和循环加载试验。试验以耗能梁段长度为变化参数,研究试件的破坏模式和主要抗震性能指标。研究结果表明,高强钢组合K形偏心支撑钢框架的承载力高、延性较好、耗能能力强;剪切屈服型试件的耗能能力好于弯曲屈服型;单调加载的破坏位移远比循环加载的大,前者的承载力高于后者,但相同位移时前者的荷载低于后者;循环荷载作用下试件破坏主要集中在第一道抗震防线耗能梁段上,此时高强钢构件基本处于弹性工作状态,残余变形较小;高强钢组合K形偏心支撑钢框架是一种有利于震后修复的双重抗侧力体系。
High-strength steel combination of eccentric support steel frame is a kind of energy consumption beam section with lower yield point of steel (Q235, Q345), other components using high-strength steel (Q460, Q690) of the new structural system. In order to study its seismic performance, monotonous loading test and cyclic loading test were carried out on four 1: 2 scale single-span single-span high-strength steel K-section eccentric supported steel frame planar specimens. In the experiment, the length of the energy dissipating beam segment was used as a parameter to study the failure modes and the main seismic performance indexes of the specimens. The results show that the bearing capacity of high-strength steel K-shaped eccentric support steel frame is high, the ductility is good, and the energy dissipation ability is strong. The energy dissipation capacity of shear yielding specimen is better than that of bending yielding. The loading capacity of the former is higher than that of the latter, but the load of the former under the same displacement is lower than that of the latter. Under the cyclic loading, the specimen damage mainly concentrates on the first earthquake-resistant and energy-dissipation beam segment, The steel members are basically in a flexible working condition and the residual deformation is small. The K-shaped eccentric supporting steel frame with high strength steel is a double anti-side force system that is beneficial to post-earthquake repair.