钢桥面板U肋与顶板焊根疲劳寿命预测方法对比分析  

Contrastive Analysis of Fatigue Life Prediction Methods for Welding Roots in U-Rib and Orthotropic Steel Bridge Deck

作　　者：杨沐野 吉伯海[1] 傅中秋[1] 徐汉江[2] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]苏州市航道管理处,江苏苏州215000

出　　处：《郑州大学学报（工学版）》2015年第2期22-27,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51278166);高等学校博士学科点专项科研基金(20120094110009);江苏省交通科学研究计划项目(2011Y09-1;2012Y13)

摘　　要：为了对正交异性钢桥面板U肋与项板焊缝疲劳细节进行轮载作用下受力分析及损伤度预测影响因素分析,以南京长江三桥及实测车流数据为背景,建立多种有限元模型,对不同的疲劳效应计算方法进行对比分析.结果表明：钢桥面板的应力幅计算中,采用国内车轮横向分布模型所计算的轮迹修正系数约为欧洲规范车轮横向分布模型的0.7 ～0.8倍.基于累计损伤破坏准则,名义应力法偏安全;有效缺口应力法的预测稳定性不够;针对文中钢桥面板细节的有限元疲劳寿命预测,1 mm热点应力法理论性强,结果稳定性好,结果最为精确.建议使用该方法对钢桥面板顶板与横隔板细节进行疲劳预测.Based on the 3rd Nanjing Yangtze River Bridge and the measured data of traffic, the analysis of the stress and damage prediction influencing factors of the fatigue details on welding roots in U - Rib and orthotropic steel bridge deck under the and the wheel load is made. Based on the cumulative damage failure criterion, fatigue damage degree calculated by nominal stress method is more reliable and notch stress is not stable while compare to other methods. For the steel deck plate details in this paper, FE analysis prediction of fatigue life showed that 1 mm hot spot stress method is of strong theory and most accuracy results. This approach is recommended for predicting the fatigue life of details on welding roots in U - Rib and orthotropic steel bridge decks.

关 键 词：钢桥面板 疲劳寿命预测 轮载横向分布 有限元模型 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]