基于实测车流的悬索桥吊杆钢丝寿命期内的疲劳评定  

Fatigue Assessment of Hanger Wires of Suspension Bridges in Its Operation Life Based on In-situ Traffic Flow

作　　者：曾勇[1,2] 陈艾荣[3] 谭红梅[1,2] 

机构地区：[1]重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地,重庆400074 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [3]同济大学桥梁工程系,上海200092

出　　处：《防灾减灾工程学报》2014年第2期185-191,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家973计划前期研究专项课题(2012CB723305);交通运输部应用基础研究项目(2013319814180);国家留学基金资助项目(201308505149);国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金项目(SLK2013B04)资助

摘　　要：将过桥实测车流数据与数值模拟分析结合起来,以江阴大桥的吊杆为研究对象,考虑不同车道对吊杆疲劳寿命的影响,建立了大跨度悬索桥疲劳车辆荷载模型和吊杆钢丝寿命期内的疲劳评估实用方法以及基于S-N曲线的吊杆寿命期内的疲劳损伤评定方法。研究结果表明,跨中短吊杆的疲劳退化快于桥塔附近的长吊杆,短吊杆是疲劳养护的重点;在吊杆的20年寿命期内,不需要考虑疲劳更换,但需要对跨中短吊杆采取监视措施。该方法可用于悬索桥吊索的安全评估与剩余寿命分析,能为吊杆的检测、维护与管理提供决策依据。Integrating traffic data measured from in-situ bridges with those from numerical simulation analysis,fatigue vehicle load model and fatigue evaluation method of hangers in large span suspension bridges are established in this paper.The effect of different lanes on hangers′fatigue life is considered.Taking the hangers of Jiangyin Bridge as the research example,the evaluation method based on S-Ncurve of suspenders fatigue damage is proposed,which can provide scientific basis for detection,repair,and management decision of suspenders.The research result shows that the fatigue life of short suspenders is shorter than the longer ones and short suspenders are the focus of maintenance.Fatigue replacement of hangers of Jiangyin Bridge doesn′t need to be considered in the 20years design life,but monitoring measures should be taken for short hangers.The method presented in this paper can be used for cable suspension bridge safety assessment and residual life analysis.

关 键 词：悬索桥 吊杆钢丝 实测车流 累积损伤度 疲劳评估 

分 类 号：U448[建筑科学—桥梁与隧道工程]