列车诱发振动对转体施工桥梁稳定性影响分析

发布时间：2018-07-28 12:35

【摘要】：桥梁在转体施工过程中通常要封闭其所跨越的铁路或公路,因而对交通特别是城市交通造成较大影响。本文以秦皇岛市西部快速路工程跨越京哈铁路转体施工桥梁为依托,利用加速度传感器测试了不同类型列车通过时球铰附近的地基振动情况,并运用有限元软件Midas对测得的加速度时程曲线进行了分析,评估了列车诱发的振动对转体桥稳定性的影响。研究结果表明:列车诱发的振动不会对该转体施工桥梁的稳定性产生很大的影响;梁体各点振动位移和加速度远小于本地区抗震设防烈度值;梁体不会由于列车诱发的地面振动而晃动,更不会倾覆;桥梁在转体施工过程中可以不封闭所要跨越的铁路。其它类似桥梁可采用同样的分析方法评估列车诱发振动对转体施工桥梁稳定性的影响,从而决定是否封闭交通。
[Abstract]:The bridge usually has to close the railway or highway it crosses in the process of rotating construction, so it has a great influence on the traffic, especially the urban traffic. Based on the bridge construction of the western expressway project of Qinhuangdao city, the vibration of the foundation near the spherical hinge of different types of trains is measured by using acceleration sensors. The time-history curve of the measured acceleration is analyzed by using the finite element software Midas, and the influence of the vibration induced by the train on the stability of the rotary bridge is evaluated. The results show that the vibration induced by train will not have a great effect on the stability of the bridge, and the vibration displacement and acceleration at each point of the beam are far less than the seismic fortification intensity in this area. The beam body will not shake or overturn because of the ground vibration induced by the train, and the bridge can not close the railway to be crossed during the turning construction. Other similar bridges can use the same analytical method to evaluate the influence of train-induced vibration on the stability of the bridge in turn construction, so as to determine whether the traffic is closed or not.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家863重点项目(2008AA030707)
【分类号】：U445.4;U441

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