Q800高强钢焊接工字形截面残余应力试验分析  

Experimental investigation of residual stress in welded Q800 high strength steel I-shaped cross-section

作　　者：曹现雷[1,2,3] 沈浩 徐勇 钟雯 

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243000 [2]江苏省结构工程重点实验室,苏州215011 [3]Department of Civil and Environmental Engineering,Sejong University

出　　处：《焊接学报》2018年第3期36-41,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51208002);安徽省自然科学基金资助项目(1608085ME115);江苏省结构工程重点实验室课题资助项目(ZD1404);安徽省住房城乡建设科学技术计划资助项目(2015YF-35);校研究生创新项目(2016087);大学生创新创业项目(201610360025)

摘　　要：为研究Q800高强钢焊接工字形截面的纵向残余应力分布规律,采用线切割法对4个试件进行试验研究,分析腹板和翼缘板件宽厚比对残余应力的影响,研究各板间残余应力的相互影响及其自平衡性,提出Q800高强钢焊接工字形截面的残余应力分布模型和计算公式.结果表明,Q800高强钢工字形截面的残余应力分布形式与普通强度钢材的一致.焊缝和火焰切割边附近呈现残余拉应力,且随着宽厚比的变化呈不规律变化;翼缘外伸部分中部和腹板中部都呈现基本恒定的残余压应力,且随着板件宽厚比的提高而相应减小;其余部位是从残余拉应力到残余压应力转变的过渡区域;翼缘和腹板内的残余应力基本满足自平衡条件,二者没有相互间的影响作用.An experimental study is conducted to investigate the longitude residual stress in Q800 high strength steel welded I-sections using the sectioning method. The effect of the width-thickness ratio of web and flange on the distribution of the residual stress,including the interaction and stress equilibrium,was analyzed. And the models of estimating the distribution and magnitude of residual stress are proposed. The results show that the distribution of the residual stress of Q800 high strength steel I-shaped cross-section is similar to that of ordinary-strength steel. The tensile stress which locates around the welding zones and the edges of flange presents an irregular relation with the changes of width-thickness ratio of plates. The constant compressive stress distributes in the middle portion of the projecting flange and web,and decreases as the width-thickness ratio of plates increases. The remaining parts are the transition regions from tensile stress to compressive stress. The residual stress in the flange and web can satisfy the self-equilibrium condition,and no interaction between the flange and web exists.

关 键 词：高强钢 线切割 焊接工字形 纵向残余应力 分布模型 

分 类 号：TG404[金属学及工艺—焊接]