预制混凝土管组合柱-钢梁节点抗震性能有限元分析

Finite Element Analysis of Seismic Behavior of Concrete-filled Precast Concrete Tube Column to Steel Beam Connections

针对采用不同加强形式的预制混凝土管组合柱-钢梁节点,通过建立精细化有限元模型,对节点的抗震性能进行了分析,研究了不同加强形式对节点抗震性能和承载力的影响。通过有限元参数化分析,研究了轴压比、钢梁翼缘加强宽度和加强长度对节点承载力的影响。分析结果表明:随着轴压比的增加,节点峰值荷载增幅在4%以内,轴压比对节点承载力影响较小;节点采取钢梁翼缘加强宽度后,峰值承载力提高约20%,节点钢梁翼缘加强宽度大于75mm后,增加加强宽度对节点峰值承载力的影响较小;钢梁翼缘加强长度对节点峰值承载力提升的效果有限,建议加强长度取翼缘宽度的1.7倍左右。

A refined finite element model was established to analyze the seismic behavior of concrete-filled precast concrete tube column to steel beam connections with different strengthening forms.The influence of dif-ferent strengthening forms on the seismic behavior and bearing capacity of the joints was studied.The effects of axial compression ratio,steel beam flange reinforcement width and reinforcement length on the bearing capacity of the joints were studied using parametric analysis of the finite element model.The analysis results indicated that with the increasing of axial compression ratio,the peak load increased less than 4%,and the effect of axial compression ratio on the bearing capacity of the joints was relatively small.The peak bearing capacity of the joints with strengthened beam width increased by about 20%.When the strengthened width of the flange of the steel beam was more than 75mm,the increase of strengthened beam width produced little effect on the peak bearing capacity of the joints.The reinforcement length of the steel beam flange had limited effect on the peak bearing capacity of the joints.The recommended reinforcement length is about 1.7 times the width of the flange.