装配式方钢管混凝土柱-钢梁节点抗震性能有限元分析

Finite element analysis of seismic performance of assembled concrete-filled square steel tubular column and steel beam connections

提出一种新型装配式方钢管混凝土柱-钢梁节点,为研究该类节点的抗震性能,基于ABAQUS建立了9个新型装配式节点的有限元模型,分析比较了轴压比、端板厚度和竖向肋板宽度对节点抗震性能的影响,对节点的滞回曲线和骨架曲线、延性和耗能能力、刚度退化等抗震性能进行了对比分析。结果表明:在0.3~0.6范围内提高轴压比,节点的极限承载力和初始刚度略有降低,但耗能能力、延性提高;设置端板,滞回曲线变得更加饱满,节点的极限承载力和耗能能力有较大的提升,随着端板厚度的增加,其延性和耗能能力降低;当竖向肋板宽度为90mm时节点的耗能能力和延性较好。

A new type of fabricated square concrete filled steel tubular column and steel beam joint is presented.In order to study the seismic performance of this kind of joint,the finite element model of nine new fabricated joints is established based on ABAQUS.The effects of axial compression ratio,end plate thickness and vertical floor width on the seismic performance of the joints were analyzed and compared.The hysteresis curve and skeleton curve,ductility and energy dissipation capacity,stiffness degradation and other seismic performance of the joints were compared.Results indicate that when the axial compression ratio is increased within the range of 0.3~0.6,the ultimate bearing capacity and initial stiffness of the joints are slightly reduced,but the energy dissipation capacity and ductility are increased.When the end plate is set,the hysteresis curve becomes fuller,and the ultimate bearing capacity and energy dissipation capacity of the joints are greatly improved.As the thickness of the end plate increases,its ductility and energy dissipation capacity decrease.The energy dissipation capacity and ductility are better when the vertical floor width is 90mm.