正交异性钢桥面板U肋对接焊缝疲劳寿命评估

发布时间：2018-05-31 02:35

本文选题：桥梁工程 + U肋　；参考：《重庆交通大学学报(自然科学版)》2015年01期

【摘要】：基于江阴长江大桥U肋对接焊缝实时动态应变监测,结合雨流计数法以及BS5400规范,对江阴长江大桥正交异性钢桥面板U肋对接焊缝疲劳寿命进行了研究。通过标准车辆荷载模型以及车流仿真模拟,获得移动车辆荷载作用下焊缝处的应力变化,进行了损伤度计算,并将数值计算与实测分析结果作了详细对比。实测结果表明:慢车道与快车道应力幅分别为70与110 MPa,均超过了该部位的疲劳极限值,随着疲劳损伤累计可能发生破坏。计算结果显示车辆经过桥面时焊缝处产生了较大的应力幅,但以损伤累计以低循环累计为主。慢车道U肋对接焊缝处疲劳寿命低于大桥设计寿命,应当及时给予关注。
[Abstract]:Based on the real-time dynamic strain monitoring of U-rib butt weld of Jiangyin Yangtze River Bridge, combined with rain flow counting method and BS5400 code, the fatigue life of U-rib butt weld of orthotropic steel bridge face of Jiangyin Yangtze River Bridge is studied. Through the standard vehicle load model and the simulation of vehicle flow, the stress change of weld seam under moving vehicle load is obtained, and the damage degree is calculated, and the numerical calculation is compared with the measured results in detail. The measured results show that the stress amplitudes of slow lane and fast lane are 70 and 110 MPa, respectively, which exceed the fatigue limit value of this part, and may be destroyed with fatigue damage accumulative. The results show that there is a large stress amplitude at the weld seam when the vehicle passes through the bridge deck, but the accumulation of damage is mainly low cycle accumulative. The fatigue life of U-rib butt weld seam in slow lane is lower than that of bridge design, so attention should be paid to it in time.
【作者单位】：河海大学土木与交通学院;江苏扬子大桥股份有限公司;江苏省交通运输厅工程质量监督局;
【基金】：国家自然科学基金项目(51278166) 高等学校博士学科点专项科研基金项目(20120094110009) 江苏省交通科学研究计划项目(2011Y09-1,2012Y12)
【分类号】：U443.31

【共引文献】