基于车桥耦合动力分析的钢桥疲劳损伤与剩余寿命评估

发布时间：2018-07-25 06:00

【摘要】：提出基于车桥耦合动力分析的钢桥疲劳评估方法,建立车桥动力系统模型进行列车过桥耦合振动分析,求解桥梁构件疲劳应力,在此基础上,采用S-N曲线法对关键构件的疲劳损伤和剩余使用寿命进行评估。以一座铁路下承式钢桁梁桥为例,利用实测应力数据对所提方法进行验证,与既有方法评估结果进行比较,并研究了车速和轨道不平顺对桥梁疲劳性能的影响。结果表明:本文方法所得构件疲劳应力与实测数据符合较好,能够对铁路钢桥疲劳损伤和使用寿命进行准确评估;列车速度对桥梁疲劳性能有显著的影响,构件疲劳损伤程度并不一定随着车速的提高而增大;轨道不平顺能够显著影响桥梁疲劳损伤累积,轨道平顺性越好,构件疲劳损伤程度越低,加强轨道维护、保持良好轨道状态能够有效延长铁路钢桥的疲劳使用寿命。
[Abstract]:A method of fatigue evaluation of steel bridge based on vehicle-bridge coupling dynamic analysis is put forward. The model of vehicle-bridge dynamic system is established to analyze the coupling vibration of train crossing bridge, and the fatigue stress of bridge member is solved. S-N curve method is used to evaluate the fatigue damage and residual service life of key components. Taking a railway through steel truss bridge as an example, the proposed method is verified by the measured stress data, and compared with the results of the existing methods. The effects of speed and track irregularity on the fatigue performance of the bridge are studied. The results show that the fatigue stress obtained by this method is in good agreement with the measured data, and it can accurately evaluate the fatigue damage and service life of railway steel bridges, and the train speed has a significant effect on the fatigue performance of the bridges. The fatigue damage degree of the component does not necessarily increase with the increase of the speed; the track irregularity can significantly affect the fatigue damage accumulation of the bridge, the better the track ride comfort, the lower the fatigue damage degree of the component, and strengthen the track maintenance. Maintaining good track condition can effectively prolong the fatigue life of railway steel bridge.
【作者单位】：东南大学土木工程学院;北京交通大学土木建筑工程学院;北京铁路局工务处桥检队;
【基金】：国家科技支撑计划(2014BAK11B00) 国家重点基础研究发展计划(973计划)(2013CB036203) 中央高校基本科研业务费(C15JB00300)
【分类号】：U448.36

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