桥墩横向变位和基础刚度变化对高速铁路行车安全性的影响

Influence of Pier Transverse Displacement and Foundation Stiffness Change on High Speed Running Safety

以高速铁路32 m多跨简支箱梁为研究对象,采用车桥耦合动力求解方法分析了桥墩横向变位和基础刚度变化对行车安全性的影响。结果表明,墩顶横向变位的安全限值为40 mm,桥墩单独发生变位对行车安全性的影响小于多墩横向变位。跨中横向振幅和墩顶横向振幅随车速的变化具有一定随机性,采用限制车速的方法可有效提高列车运行安全性。桥梁运营安全性指标相较于列车运行安全性指标更加敏感,高速铁路桥梁刚度储备较大,桥墩、梁体、支座等其他构件会减小局部损伤对行车安全性的影响,在日常检查中需重点关注基础局部较大病害。

Taking a 32 m multi-span simply supported box girder of high speed railway as the research object,the influence law of the pie transverse displacement and the foundation stiffness change on the running safety was analyzed by using the vehicle-bridge coupling dynamic solution method.The results show that the safety limit of pier top transverse displacement is 40 mm,and the influence of single pier displacement on the running safety is less than that of multi-pier transverse displacement.The variation of the transverse amplitude of the middle span and the pier top with the speed has certain randomness,and the method of limiting the speed can effectively improve the train operation safety.Compared with the train operation safety index,the bridge operation safety index is more sensitive.The high speed railway bridge stiffness reserve is large,pier,girder,bearing and other components will reduce the impact of local damage on running safety,so it is necessary to pay attention to the local large disease of foundation in daily inspection.