考虑腐蚀影响的钢箱梁顶板焊缝局部应力数值模拟分析  

Numerical simulation analysis of local stresses of deck welds for steel box girder considering corrosion effect

作　　者：揭志羽 朱建朝 王维国 JIE Zhiyu;ZHU Jianchao;WANG Weiguo(Ningbo Communication Construction Engineering Testing Center Co.,Ltd.,Ningbo 315124,China;School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波市交通建设工程试验检测中心有限公司,浙江宁波315124 [2]宁波大学土木工程与地理环境学院,浙江宁波315211

出　　处：《宁波大学学报(理工版)》2025年第1期14-18,共5页Journal of Ningbo University:Natural Science and Engineering Edition

基　　金：浙江省自然科学基金(LY24E080001);中国博士后科学基金面上项目(2023M742607)。

摘　　要：为了探明腐蚀损伤对疲劳构造细节局部应力的影响,以钢箱梁节段模型为研究对象,考虑3种横向加载工况,研究顶板焊缝热点应力和有效缺口应力的分布规律.考虑环境腐蚀对顶板和横隔板厚度的影响,得到顶板焊缝焊趾和焊根以及弧形缺口处应力随服役时间的变化规律.结果表明:(1)焊根处的应力比焊趾和弧形缺口处的应力都大,表明焊根更容易成为疲劳易损部位.(2)随着服役时间的增加,钢板厚度减小,应力总体增大,顶板焊缝热点应力最大增幅达到56%.(3)推荐采用有效缺口应力对顶板焊缝疲劳开裂问题进行研究,且钢箱梁抗疲劳设计应当考虑环境腐蚀的影响.In order to investigate the influence of corrosion on the local stress of fatigue vulnerable parts for steel box girders,the steel box girder segment model was employed.Three loading conditions in transverse direction were taken into account,so as to study their influences on the hot spot stress and effective notch stress at the vulnerable parts of the deck weld.Finally,the impact of environmental corrosion on the thickness of the top plate and the diaphragm was considered,and the variations in the stress with service time,at the weld toe,root and arc notch of the top plate,were obtained.The results show that the stress at the weld root is greater than those at both the weld toe and the arc notch,showing that the weld root is a more fatigue vulnerable part.The thickness of the steel plate decreases with the increase of service time,and the hot spot stress of deck weld increases by 56%.It is suggested that the effective notch stress should be used in studying the fatigue cracking of the deck weld,and the influence of environmental corrosion should be considered in the fatigue design of steel box girders.

关 键 词：钢箱梁 腐蚀损伤 幂函数模型 热点应力 有效缺口应力 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]