高层建筑钢结构梁柱节点的冲击荷载性能研究

The impact load behavior of steel beam and column joints in high-rise buildings

为提升高层建筑的抗震能力,研究其钢结构梁柱节点的冲击荷载性能。依据狗骨式节点模型设计3种不同削弱尺寸的狗骨式钢结构梁柱节点试件(RDH1、RDH2、RDH3),并与普通试件(E)对比,采用有限元网格划分梁翼缘削弱位置与柱节点域,用千斤顶分别在柱上端和两侧悬臂梁端施加荷载,并依据加载顺序对各试件实行荷载,通过传感器测量各试件反应。结果表明:RDH1的骨架承载力、悬臂梁端承载力、初始刚度及荷载性能均最高,RDH3的延展性与耗能能力较好,RDH1、RDH2、RDH3的骨架与悬臂梁端承载力及荷载性能等均优于E。说明狗骨式节点冲击荷载性能优于普通节点,可用于提升高层建筑的抗震能力。

In order to improve the seismic resistance of high-rise buildings,the impact load performance of steel beam-columnjoints was studied. Three dog-bone steel structural beam-column joint test specimens(RDH1,RDH2,RDH3)with differentweakening sizes were designed according to the dog-bone joint model,and compared with ordinary test specimens(E),thebeam flange weakening positions were divided by using finite element meshes. With the column node domain,a jack was appliedto the upper end of the column and the ends of the cantilever beams on both sides,and the load was applied to each test pieceaccording to the loading order. The response of each test piece was measured by sensors. The results show that the skeletonbearing capacity of RDH1,the cantilever beam end bearing capacity,initial stiffness and load performance are the highest.RDH3 has better ductility and energy consumption. The end bearing capacity and load performance of RDH1,RDH2,RDH3 skeleton and cantilever beam are better than those of E. It shows that dog-bone joints have better impact load performance thanthe ordinary joints and can be used to improve the seismic resistance of high-rise buildings.