拟静力分量对列车-轨道-桥梁系统地震响应的影响

发布时间：2017-12-27 04:10

本文关键词：拟静力分量对列车-轨道-桥梁系统地震响应的影响　出处：《西南交通大学学报》2015年01期 　论文类型：期刊论文

【摘要】：为探讨结构拟静力分量对地震作用下高速铁路桥上列车行车安全性的影响,考虑路基和桥梁地震力边界条件,分别采用相对运动法和大质量法,在相对坐标系和绝对坐标系下处理地震力边界条件,建立了不同坐标系下的列车-轨道-桥梁系统地震响应分析模型.以跨度48 m+5×80 m+48 m的刚构-连续组合梁桥为例,分析了结构单向和三向拟静力分量对列车-轨道-桥梁系统地震响应的影响.结果表明:结构横向拟静力分量将显著增大桥梁横向位移、钢轨横向位移、列车脱轨系数和轮重减载率,而纵向、竖向拟静力分量的影响甚微;同时考虑结构的三向拟静力分量时,列车脱轨系数和轮重减载率均显著增大,且其相对误差随列车速度提高而增大,最大达30.5%和22.2%.因此,不考虑结构拟静力分量在列车速度较高时将严重低估车辆的动力响应,对桥上列车的行车安全性造成误判.
[Abstract]:In order to investigate the structure of quasi static components on the high-speed railway bridge under the earthquake effect on train running safety, considering the subgrade and bridge seismic force boundary conditions, using the relative motion method and large mass method, seismic force boundary conditions in relative coordinates and absolute coordinates, analysis model is established in response to different coordinates the train track bridge system in earthquake. With a span of 48 m+5 * 80 m+48 m rigid continuous beam bridge as an example, analyzes the structure of one-way and three pseudo static component of the train track bridge system seismic response. The results show that the structure of transverse quasi-static components will significantly increase the lateral displacement of the bridge rail, transverse displacement, derailment coefficient and reduction rate of wheel load, and the longitudinal and vertical quasi static components have little effect; considering the structure of the three component quasi static, train derailment coefficient and wheel load reduction Loading rate increased significantly, and the relative error as the train speed increases, the maximum of 30.5% 22.2%. and therefore, without considering the structure of pseudo dynamic static component in high speed train will seriously underestimate the response of a vehicle, the traffic safety of train on bridge caused by misjudgment.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378429,51308470) 国家973计划资助项目(2013CB036301) 国家863计划资助项目(2011AA11A103)
【分类号】：U442.55
【正文快照】： 我国位于世界两大地震带——环太平洋地震带和亚欧地震带之间,是全球大陆地震最活跃的地区之一.地震除引起桥梁结构本身破坏外,对桥上列车行车安全性的影响不容忽视.如在日本新o_地震中就曾发生过运行于高架桥上的新干线列车脱轨的事故,造成了惨重的人员伤亡和经济损失.近年来

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