考虑荷载影响面的钢桥面板顶板-U肋焊缝疲劳损伤分析  

Fatigue Damage Analysis of Rib-to-Deck Weld Joints of Steel Bridge Deck Considering Load Influence Surface

作　　者：吉伯海[1] 徐捷[1] 姚悦[1] 傅中秋[1] JI Bohai;XU Jie;YAO Yue;FU Zhongqiu(College of Civil&Transportation Engineering,Hohai University,Nanjing 210098,Jiangsu,P.R.China)

机构地区：[1]河海大学土木与交通学院

出　　处：《重庆交通大学学报（自然科学版）》2019年第11期27-33,57,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金面上项目(51678215)

摘　　要：为研究荷载影响面对钢桥面板顶板-U肋连接焊缝疲劳损伤的影响,建立了钢桥面板有限元节段模型,通过施加车轮荷载,研究了顶板-U肋连接焊缝疲劳损伤特征;对比分析了在车轮荷载不同横向位置e作用下焊缝的纵向应力分布,研究了顶板-U肋连接焊缝的荷载影响面,分析了过焊孔构造对顶板-U肋连接焊缝的疲劳损伤度D的影响;在考虑轮迹横向分布的基础上,计算了车轮荷载作用下焊缝的疲劳损伤度D,并与规范的计算结果进行了对比。研究表明:顶板-U肋连接焊缝的应力横向影响范围e=750 mm,纵向影响范围约为2个横隔板之间距离;设置过焊孔可降低焊缝局部应力,但将大幅度增大焊缝处的疲劳损伤度。建议选取荷载横向分布彫响范围e=750 mm,由此计算的疲劳损伤度D比按规范计算的结果大10%以上,更全面地考虑了轮迹横向分布对顶板-U肋连接焊缝疲劳损伤的影响。In order to study the effect of the load influence surface on fatigue damage analysis of rib to deck weld joints of steel bridge deck,a finite element segment model of steel bridge deck was established.And the fatigue damage characteristics of rib to deck weld joints were studied by applying the wheel load.The longitudinal stress distribution of weld was compared and analyzed under different transverse positions e of wheel load.The load influence surface of rib to deck weld joints was studied.The influence of over welded hole structure on the fatigue damage degree D of rib to deck weld joints was analyzed.Based on horizontal distribution of wheel tracking,the fatigue damage degree D of weld under wheel loads was calculated and compared with the calculated results of the Spedfication.The research indicates that the stress transverse influence range of rib to deck weld joints is about 750mm,and the longitudinal range is about the distance between 2 transverse diaphragms.The setting of over welded holes can reduce the local stress of the weld,but it will greatly increase the fatigue damage degree of the weld.It is suggested that the influence range of transverse load distribution e=750 mm should be selected.The fatigue damage degree D calculated from the proposed method is more than 10%larger than that calculated according to the Spedfication.The effect of transverse distribution of wheel tracking on fatigue damage of rib to deck weld joints is considered more comprehensively.

关 键 词：桥梁工程 钢桥面板 影响面 疲劳损伤 轮迹分布 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]