腹板开孔型节点力学性能研究及钢框架Pushover分析

Pushover Analysis of Steel Frames and Mechanical Properties with Web Open Joints

采用有限元数值模拟方法,通过ABAQUS软件建立了普通型节点和3种不同开孔型式的腹板开孔型节点三维钢结构节点模型,探究对比分析不同节点的破坏形式、承载力、滞回性能、耗能能力、强度及刚度退化等性能。通过SAP2000软件建立基于削弱型节点的钢框架模型并进行了Pushover分析。研究结果表明:相对于普通型节点的腹板开孔型节点均可实现梁端塑性铰外移至梁端腹板开孔处,避免了钢结构的脆性破坏,增加了其延性性能,但结构承载能力有一定的降低;腹板开椭圆孔型节点的等效黏滞阻尼系数与普通钢框架相比有明显的增大,其耗能能力提高;腹板开孔型节点的刚度退化速率均低于普通型节点模型,腹板开孔型节点钢框架模型可形成梁铰延性破坏机制,提高了其抗震性能。

The three-dimensional steel structure joint models of ordinary joints and three different web opening joints are established by ABAQUS software and to compare the failure forms,bearing capacity,hysteretic performance,energy dissipation capacity,strength and stiffness degradation of different joints.The steel frame model based on the weakened node was established by SAP2000 software and the Pushover analysis of the steel frame model was carried out.The research results are as follows.The plastic hinge of the beam end can be moved to the opening of the web end of the beam at the end of the web with the open-ended joint of the common type node,which avoided the brittle failure of the steel structure and increases the ductility,but the structural carrying capacity was reduced.The equivalent viscous damping coefficient of the open elliptical hole joint of the web has a significant increase compared with the ordinary steel frame,and its energy consumption capacity was improved.The stiffness degradation rate of web opening joint is lower than that of ordinary joint model.The steel frame model of web opening joint can form the ductile failure mechanism of beam hinge and improve its seismic performance.