考虑残余应力的钢桥面板-肋双面焊裂纹应力强度因子计算方法

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中文摘要：建立焊接分析有限元模型,对顶板-纵肋双面焊构造的焊接过程进行数值模拟,拟合得到顶板焊趾细节沿板厚方向分布的横向残余应力分布经验公式;建立钢桥面板断裂力学数值模型,结合统一的权函数表达式,推导适用于顶板焊趾处裂纹最深点和表面点应力强度因子的新权函数,并将权函数计算的应力强度因子与有限元计算的应力强度因子进行对比.研究结果表明:顶板-纵肋双面焊顶板焊趾处残余应力沿板厚方向处于拉—压—拉状态,呈正弦函数分布;在二次应力分布下,权函数法与有限元法计算所得顶板焊趾处裂纹最深点应力强度因子最大相对误差为7.4%,表面点应力强度因子最大相对误差为4.1%;在焊接残余应力场下,权函数法与有限元法计算所得顶板焊趾处裂纹最深点应力强度因子最大相对误差为7.6%,表面点应力强度因子最大相对误差为8.6%;权函数法能有效计算钢桥面板-肋双面焊顶板焊趾处疲劳裂纹应力强度因子.

外文标题：Calculation method of stress intensity factor for crack of rib-to-deck double-sided welded joints in steel bridge deck considering residual stress

外文摘要：A finite element model of welding analysis was established to simulate the welding process of rib-to-deck double-sided joints,and an empirical formula for the transverse residual stress distribution along the direction of plate thickness was obtained.The weight functions for the stress intensity factor at the deepest point and surface point of the fatigue crack at the welded toe of the deck were fitted using a unified weight function expression and numerical analysis results from fracture mechanics of steel bridge decks.The stress intensity factors calculated by the weight function were compared with those calculated by finite element analysis.The results show that the residual stress at the weld toe of the rib-to-deck double-sided welded joints exhibits a tension-compression-tension state along the plate thickness direction,and follows a sinusoidal function distribution.Under the secondary stress distribution,the maximum relative error of the stress intensity factor at the deepest point of the crack calculated using the weight function method and the finite element method is 7.4% ,and the maximum relative error of the stress intensity factor at the surface point of the crack is 4.1% .Under the welding residual stress field,the maximum relative error of the stress intensity factor at the deepest point of the crack at the weld toe calculated using the weight function method and the finite element method is 7.6% ,and the maximum relative error of the stress intensity factor at the surface point of the crack is 8.6% .The weight function method can effectively calculate the stress intensity factor of fatigue crack at the welded toe of rib-to-deck double-sided welded joints in orthotropic steel decks.

外文关键词：

orthotropic steel deckweight function methodfatigue crackstress intensity factorwelding residual stress

作者：

肖新辉、陈方怀、张海萍、刘扬、肖康海

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作者单位：

湖南工业大学土木工程学院,湖南株洲,412007

长沙理工大学土木工程学院,湖南长沙,410114

关键词：

正交异性钢桥面板权函数法疲劳裂纹应力强度因子焊接残余应力

基金：

国家自然科学基金资助项目湖南省自然科学基金资助项目湖南省自然科学基金资助项目湖南省教育厅科学研究项目湖南省教育厅科学研究项目湖南省教育厅科学研究项目长沙理工大学交通基础设施安全风险管理行业重点实验室

项目编号：

519080682021JJ401712023JJ5018823A043522B056722C030018KF04

出版年：

2024

DOI：

10.11817/j.issn.1672-7207.2024.02.030

中南大学学报(自然科学版)

中南大学

中南大学学报(自然科学版)

CSTPCD北大核心

影响因子：0.938

ISSN：1672-7207

年,卷(期)：2024.55(2)

参考文献量25