斜交T形焊接接头热点应力集中系数  

Hot spot stress concentration factor for welded skewed-T joints

作　　者：卫星[1] 张永琦 赵骏铭 王慧君 肖林[1] WEI Xing;ZHANG Yong-qi;ZHAO Jun-ming;WANG Hui-jun;XIAO Lin(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway First Survey and Design Institute Group Ltd.,Xi'an 710043,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《吉林大学学报(工学版)》2024年第12期3478-3485,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2022YFB3706703);蜀道投资集团科技计划项目(SRIG2020GG0001)。

摘　　要：运用ABAQUS有限元软件建立150个不同角度、板厚比、长厚比的斜交T形焊接接头有限元模型,分析得到关键点最大热点应力集中系数。基于麦夸特法+通用全局优化法对数据进行拟合,给出最大热点应力集中系数简化公式和精细化公式。结果表明:钝角侧焊趾热点应力集中系数总是大于锐角侧,当角度差距减小时,两侧热点应力集中系数差值相应减小;斜交T形接头焊趾处热点应力集中系数与角度、板厚比、长厚比均呈正相关关系,角度为80°、板厚比为2、长厚比为18时达到最大值;本文所提出的最大热点应力集中系数计算公式与有限元数值结果吻合较好,精细化公式相关系数R2达到了99.97%。Using Abaqus finite element software,150 finite element models of oblique T-shaped welded joints with different angles,plate thickness ratios,and length-to-thickness ratios were established to analyze and obtain the maximum hot spot stress concentration factors(HSCFs)at critical points.Based on the Levenberg-Marquardt algorithm combined with a general global optimization method,the data were fitted to derive simplified and refined formulas for the maximum HSCF.The results indicate that the HSCF at the toe of the obtuse angle side is always greater than that at the acute angle side,and as the angle difference decreases,the difference in HSCFs between the two sides correspondingly diminishes.The HSCF at the toe of the oblique T-shaped joint shows a positive correlation with the angle,plate thickness ratio,and length-to-thickness ratio,reaching its maximum when the angle is 80°,the plate thickness ratio is 2,and the length-to-thickness ratio is 18.The proposed formulas for calculating the maximum HSCF show good agreement with the finite element numerical results,with the correlation coefficient R²of the refined formula reaching 99.97%.

关 键 词：桥梁工程 热点应力 疲劳 应力集中系数 斜交T形焊接接头 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]