基于ANSYS的单轴对称焊接工字形截面残余应力分析  

ANALYSIS OF RESIDUAL STRESSES IN WELDED MONOSYMMETRIC I-SECTION BASED ON ANSYS SOFTWARE

作　　者：张壮南[1] 赵亚楠[1] 胡磊[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《工程力学》2013年第B06期294-297,303,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(51108279);辽宁省高等学校优秀人才支持计划项目(LJQ2012054)

摘　　要：采用ANSYS软件对单轴对称焊接工字形截面的纵向残余应力进行了三维数值模拟,将生热率和"生死单元"技术相结合有效模拟了焊缝金属的熔化、填充和凝固过程。分析时取冷却至70℃时得到的应力为焊接残余应力,研究了翼缘宽厚比对纵向残余应力分布的影响。研究表明:截面上残余拉应力峰值均达到fy;宽、窄翼缘上的残余压应力峰值分别约为0.4fy、0.3fy;腹板残余应力分布曲线呈梯形,靠近宽翼缘一侧和靠近窄翼缘一侧腹板上的残余压应力峰值分别约为0.4fy、0.3fy;随着翼缘宽厚比逐渐减小,宽、窄翼缘和腹板的残余应力峰值逐渐减小,受拉区的分布宽度有增大的趋势。The ANSYS software was used to carry out a three-dimensional simulation for the longitudinal residual stresses in a welded I-section, and the course of stuffing, melting, freezing of the metal in a welding seam were simulated successfully by the method of combining the birth-death element and the heat generation rate. The residual stresses were taken when the temperature cooled to 70℃, and the influence of the width to thickness ratio of flange on the distribution of welding residual stresses were investigated. The calculation results show that the peak value of the welding residual tensile stress in a section almost reach fy, the welding residual compressive stress peaks in a wide flange and in a narrow flange is 0.4fy and 0.3fy, respectively. The residual stress distribution curve in a web is trapezoidal, and the peak value of compressive stress closing to a wide flange and to a narrow flange reaches 0.4fy and 0.3fy, respectively. With the decrease of width to thickness ratio of flange, the welding residual stress peaks of the section decrease gradually and the distribution width of tensile area has an increasing trend.

关 键 词：钢结构 残余应力 有限元分析 单轴对称工字形 翼缘宽厚比 

分 类 号：TU391[建筑科学—结构工程]