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

发布时间：2018-01-16 06:14

本文关键词：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　出处：《湖南大学学报(自然科学版)》2017年09期 　论文类型：期刊论文

【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.
[Abstract]:In the existing fatigue analysis of arch bridge suspenders, the influence of vehicle-bridge coupling vibration and deck planeness degradation is seldom considered. As a result, the analysis results have some limitations. According to the in-service bridge deck flatness grade international general evaluation system. The degradation process of bridge deck smoothness in operation stage is simulated. A random vehicle-bridge coupled vibration analysis program has been developed. The fatigue analysis model of suspension rod of arch bridge considering the factors of vehicle-bridge coupling vibration and bridge deck degradation is established. A certain arch bridge is used as the engineering background. The fatigue damage and fatigue life of typical suspenders of arch bridge under the action of different factors are compared. The results show that the factors of vehicle-bridge coupling vibration and the degradation of deck smoothness have great influence on the fatigue of arch bridge suspenders. Under the influence of vehicle-bridge coupling and deck planeness degradation. The calculated fatigue life of suspension rod is 15 ~ 30 years less than that without considering the influence of the two factors. The research results have some engineering application value for the evaluation of the normal service state of bridge structure.
【作者单位】：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;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB057701,2015CB057702)~~
【分类号】：U441
【正文快照】： 拱桥吊杆是拱肋结构与桥面系之间的传力构件.现有在役拱桥吊杆疲劳性能研究中,常采用实桥试验及数值分析两种方法.实桥试验研究在时间、经济以及实现手段上存在诸多限制,致使试验研究较少采用,而常采用数值模拟分析.数值分析时常将疲劳荷载谱加载到拱桥模型中得到吊杆的应力谱

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