【摘要】 针对肋板加强型节点和普通节点空间钢框架的抗震性能,采用ANSYS有限元分析软件对比分析了两种钢框架的破坏形态、承载力、滞回性能、变形能力、耗能能力以及退化性能.研究结果表明,肋板加强型节点可使梁端塑性铰外移至远离梁柱连接焊缝的梁上,避免梁端应力集中导致焊缝发生脆性破坏;肋板加强节点钢框架的极限承载力、等效黏滞阻尼系数与普通钢框架相比有明显提高,进入屈服阶段后由于应力重分布及肋板参与耗能,其刚度及承载力退化速度明显低于普通节点钢框架,肋板加强节点钢框架具有明确的梁铰延性破坏机制,抗震性能更好,推荐在强震区使用.更多还原

【Abstract】 To examine the seismic performance of the common joint steel frame and the rib-reinforced joint steel frame,this paper makes a comparative analysis of two kinds of steel frame in failure modes,bearing capacity,hysteretic behavior,deformation,energy dissipation and degradation capacity by the finite element analysis software ANSYS.The analysis shows that the rib-reinforced joint can let the plastic hinge away from the welded connection of beam-column and avoid welded connection brittle fracture induced by the tie-beam stress concentration.The ultimate bearing capacity and the equivalent viscous damping ratio of the rib-reinforced joint steel frame is obviously greater than the common joint steel frame.When the steel frame enters the yield stage,the stiffness and bearing degradation of the rib-reinforced joint steel frame is more slower for the stress redistribution and the energy dissipation by the ribs.The rib-reinforced joints steel frame has a clear and ductile beam-hinge failure mechanism.The seismic performance proves to be better,and therefore it is proposed to be used in the meizoseismal areas.更多还原