考虑车-桥耦合振动及桥面平整度退化影响的拱桥吊杆疲劳分析  

Fatigue Analysis for Suspenders of Arch Bridge Addressing Vehicle-bridge Coupled Vibration and Road Surface Progressive Deterioration

作　　者：殷新锋[1] 丰锦铭 刘扬[1] 蔡春声[1] 

机构地区：[1]长沙理工大学桥梁工程安全控制省部共建教育部重点实验室,湖南长沙410114

出　　处：《湖南大学学报（自然科学版）》2017年第9期17-25,共9页Journal of Hunan University:Natural Sciences

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB057701;2015CB057702)~~

摘　　要：现有拱桥吊杆疲劳分析中,较少考虑车-桥耦合振动及考虑桥面平整度退化的影响,致使分析成果具有一定的局限性.根据在役桥面平整度等级国际通用评价体系,模拟了运营阶段桥面平整度退化历程.结合已编制随机车流-桥梁耦合振动分析程序,建立了可考虑车-桥耦合振动及考虑桥面退化等因素的拱桥吊杆疲劳分析模型.以某拱桥为工程背景,对比研究了不同因素作用下拱桥典型吊杆的疲劳损伤及疲劳寿命.结果表明,车-桥耦合振动及桥面平整度退化因素对拱桥吊杆疲劳影响较大,在考虑车-桥耦合及桥面平整度退化共同影响下,计算得到的吊杆疲劳寿命值比不考虑两者影响所得值少15~30年.研究成果对桥梁结构正常使用状态评估有一定的工程应用价值.The existing studies on the fatigue analysis for suspender of arch bridges have been found with limited consideration of the vehicle-bridge coupled vibration and road surface progressive deterioration, and those previous studies cannot reflect the actual fatigue property of the suspender. Based on the international general evaluation system of pavement roughness,a model of road surface progressive deterioration of each operation stage was established.A new model of fatigue analysis was then established by considering the effects of random traffic load model and road surface progressive deterioration. An arch bridge was taken as an example, and the differences of the fatigue performance analysis results for the typi- cal suspender were analyzed and compared by the two situations with or without consideration of the condi- tions of the bridge deterioration and vehicle-bridge coupled vibration.Compared with the existing numerical method, the analysis results obtained by the proposed method show that the effects of vehicle-bridge couple vibration and road surface progressive deterioration on the suspender fatigue are significant, and the suspender fatigue value obtained by considering the above two factors can be improved by 15 years to 30 years. Therefore, the numerical results are significant for the maintenance of existing arch bridges.

关 键 词：桥面平整度退化 车-桥耦合 吊杆 疲劳 随机车流 

分 类 号：TU311.3[建筑科学—结构工程] TU352.1