焊缝与螺栓混合连接梁柱钢节点的残余应力有限元分析  

Finite element analysis of residual stress in weld and bolt beam-column connections

作　　者：俞家欢[1] 戴利[1] 李洪双[1] 刘琼阳[1] 

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《焊接学报》2010年第10期22-26,共5页Transactions of The China Welding Institution

基　　金：中国教育部春晖计划资助项目(200707L365)

摘　　要：考虑温度变化对钢材物理性能和力学性能的影响,以热-弹塑性理论为基础,建立梁柱节点顶底角钢焊缝、螺栓混合连接的三维仿真模型.利用有限元分析软件ANSYS模拟钢结构梁柱节点在焊接和冷却阶段的温度场,并求解得到残余应力的分布.结果表明,焊缝区域主要以拉应力为主,残余应力在焊缝和螺栓等不同部位的分布不同.最大残余应力出现在顶角钢与梁翼缘的焊缝处,最小残余应力出现在柱与角钢连接处,分别是设计强度值的220.8%和11.45%,与《钢结构设计规范》中的规定基本相符.Three dimensional finite element model of welding beam-column connection components,including angle steel,bolt,beam and column,is established by taking account of the effect of temperature on the thermo-physical properties and mechanical properties of metal,and the temperature and the residual stress distributions during heating and cooling process are accurately computed by using of ANSYS software.The results show that the welding region is dominated mainly by tensile stress and different components possess different residual stress value.The maximum and minimum residual stresses occur in the bolts,which are 220.8% and 11.45% of the designing strength value respectively and are in accord with 'Code of Steel Structure'.

关 键 词：混合连接 焊缝 螺栓 残余应力 

分 类 号：TU391[建筑科学—结构工程]