不同连接形式的钢管混凝土节点抗连续倒塌与抗震综合能力分析

Analysis of Progressive Collapse Resistance and Comprehensive Seismic Capability of Concrete-Filled Steel Tubular Joints in Different Connection Types

为研究钢管混凝土结构抗连续倒塌与抗震综合防御能力,采用有限元软件ABAQUS建立了6个不同连接形式的钢管混凝土节点有限元模型,在合理选取钢材和混凝土材料本构模型的基础上,对比分析竖向荷载作用下各节点抗连续倒塌破坏特征,获得各类节点的抗倒塌承载力和破坏特征。在此基础上,计算各节点在水平低周往复荷载作用下的滞回性能,获得其承载力曲线、刚度退化、延性、耗能能力等抗震性能指标。研究结果表明:竖向荷载作用下,栓焊混合外环板式和内隔板式节点的抗连续倒塌能力较好;水平往复荷载作用下,栓焊混合外环板式和栓焊混合隔板贯通式节点的抗震能力较好。综合对比各节点的抗连续倒塌与抗震性能,建议工程设计与应用中采用钢管混凝土栓焊混合外环板式节点,其综合防御能力更好。

In order to study the resistance of progressive collapse and the earthquake performance of concrete-filled steel tubular(CFST)structures,the finite element software ABAQUS is used to build six different models of CFST joints.Based on reasonable selection of steel and concrete material constitutive models,the progressive collapse resistance characteristics of each joint under vertical load is compared,and the collapse bearing capacity is obtained.Further,the hysteretic behavior of each joint is calculated under horizontal low cycle reversed load,in order to obtain bearing capacity,stiffness degradation,ductility,energy dissipation capacity and other seismic performance indicators.The results show that under vertical load,the joints with bolted-welded hybrid outer ring plate and inner diaphragm plate have better progressive collapse resistance.Under the action of horizontal reversed load,the seismic capacity of the joints with bolted-welded hybrid outer ring plate and bolted-welded mixed through diaphragms are better.By comparing the resistance to progressive collapse and seismic performance of joints,it is suggested that in engineering design and application,CFST bolted-welded hybrid outer ring plate joint should be applied,which has better comprehensive defense capacity.