多层高强钢组合Y形偏心支撑钢框架抗震性能试验研究

为研究高强钢组合Y形偏心支撑钢框架结构的抗震性能，进行了一个1∶2缩尺模型的三层结构试件的低周往复加载试验，从结构的承载能力、刚度退化、位移延性、耗能能力及破坏模式等方面评价了结构的抗震性能，试验采用三质点倒三角形比例加载。研究结果表明：高强钢组合Y形偏心支撑结构具有较高的承载能力、较好的位移延性和耗能能力，屈服强度较低的耗能连梁的弹塑性变形耗散了大部分地震能量，而高强钢非耗能构件基本处于弹性受力状态，保证了极限状态下结构的完整性。框架梁与耗能连梁连接节点处受力复杂、应力集中严重，加之楼板对框架梁的约束，该节点处变形较大，使得试件最终在此位置破坏。

Experimental study on seismic behavior of multi-storey high strength steel composite Y-eccentrically braced steel frame

A 1∶2 scale three-story Y-shape high strength steel composite eccentrically braced frame (Y-HSS-EBF) was carried out under low-cyclic load to study its seismic performance. Based on the results, the seismic behavior is evaluated in terms of loading capacity, rigidity degeneration, ductility, energy dissipation, and the failure mode. Inverted triangular horizontal loads were applied to the frame cyclically. The research result shows that the Y-HSS-EBF structure has good loading capacity, ductility and energy dissipation capacity. The link fabricated by the lower yield strength steel dissipated most of the energy under horizontal load by plastic deformation, while the non-energy dissipation  members using high strength steel remain  elastic, to ensure the structural integrity. The damage location is the beam-link joint for its complicated stress state, stress concentration and the restraint of the floor.  Keywords