列车作用下桥梁应力响应计算方法比较

发布时间：2019-05-07 03:31

【摘要】：为有效分析列车引起的桥梁应力响应,对车桥耦合动力分析法、静力影响线法及移动集中力法3种列车作用下的桥梁应力响应计算方法进行了深入的比较研究.采用3种方法对2座铁路典型混凝土简支T梁和下承式钢桁梁桥进行应力响应分析,基于桥梁现场实测数据对比分析了不同方法的计算结果,研究了列车速度和桥梁横向振动对应力结果的影响.结果表明:车速对桥梁应力响应有显著的影响,共振发生时3种方法的计算结果相差较大,消振条件下三者区别减小;由列车水平方向作用力引起的桥梁或构件横向振动对应力响应的贡献不容忽视;车桥耦合动力分析法能够更为真实地反映桥梁构件的动应力历程,在高速、桥梁横向刚度较低或列车局部加载的情况下尤其具有计算精度优势.研究结果可为3种不同计算方法的工程应用提供参考.
[Abstract]:In order to effectively analyze the bridge stress response caused by train, three methods of calculating bridge stress response under the action of train, such as vehicle-bridge coupling dynamic analysis method, static influence method and moving concentrated force method, are compared and studied in depth. Three methods are used to analyze the stress response of two typical railway simply supported concrete T-beams and underpass steel truss bridges, and the calculated results of different methods are compared and analyzed based on the field measured data of the bridges. The effects of train speed and bridge lateral vibration on stress results are studied. The results show that the speed has a significant effect on the stress response of the bridge. The results of the three methods are quite different when resonance occurs, and the difference among the three methods decreases under the condition of damping vibration. The contribution of the lateral vibration of the bridge or member to the stress response caused by the horizontal force of the train should not be ignored. The vehicle-bridge coupling dynamic analysis method can reflect the dynamic stress course of bridge members more realistically, especially under the condition of high speed, low lateral stiffness of bridge or local loading of train. The results can be used as reference for engineering application of three different calculation methods.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;北京交通大学土木建筑工程学院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2013CB036203) “十二五”国家科技支撑计划资助项目(2014BAK11B04) 国家自然科学基金资助项目(51528802)
【分类号】：U441.5

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