非对称加强与狗骨式削弱型钢框架节点抗震性能数值模拟

Numerical Simulation of Seismic Performance of Asymmetric Strengthened and Dog Bone Weakened Steel Frame Joints

为有效防止梁柱节点处发生脆性破坏并提高节点抗震性能,提出一种非对称加强与狗骨式削弱型钢框架节点。以边柱节点为例,利用ABAQUS有限元软件对非对称加强与狗骨式削弱型节点、非对称加强型节点、狗骨式削弱型节点和普通型节点共4个节点模型进行抗震性能对比分析,研究了节点的破坏形态、滞回曲线、骨架曲线、延性、耗能能力和刚度退化等方面的区别。研究表明:非对称加强与狗骨式削弱型节点能够有效实现塑性铰外移,防止节点发生脆性破坏,同时不仅能够提高节点的耗能能力和延性,还可以保持较好的承载能力。

To effectively prevent brittle failure at beam column joints and improve the seismic performance of the joints,an asymmetric strengthened and dog bone weakened steel frame joint is proposed.Taking the edge beam column joints as example,ABAQUS finite element software is used to compare and analyze the seismic performance of four joint models,including asymmetric strengthened and dog bone weakened joints,asymmetric strengthened joints,dog bone weakened joints,and ordinary joints.The differences in the failure mode,hysteresis curve,skeleton curve,ductility,energy dissipation capacity,and stiffness degradation of the joints are studied.It is indicated in the research that asymmetric strengthened and dog bone weakened joints can effectively achieve plastic hinge outward displacement,prevent brittle failure of joints,and not only improve the energy dissipation and ductility of joints,but also maintain good bearing capacity.