列车激励下UHPC简支箱梁桥面板局部振动研究  

Research on local vibrations of bridge deck of UHPC simplysupported box girders subjected to train excitations

作　　者：孔德睿 张迅[1,2] 刘子琦 罗浩[1] 李小珍[1] Kong Derui;Zhang Xun;Liu Ziqi;Luo Hao;Li Xiaozhen(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学桥梁智能与绿色建造全国重点实验室,四川成都611756

出　　处：《土木工程学报》2024年第9期56-67,共12页China Civil Engineering Journal

基　　金：国家自然科学基金(51978580,51778534)。

摘　　要：基于现场试验分析高速列车激励下32m简支PC箱梁的局部振动行为。建立车-轨-桥耦合振动分析模型,计算梁体不同位置的加速度响应,与实测结果进行对比验证其可靠性。采用数值方法研究56m简支UHPC箱梁的局部振动特性,对比不同滤波条件下两种箱梁的振动响应,分析车速对局部振动的影响规律,讨论车桥高阶共振机理及其对行车安全性的影响。研究结果表明:梁体不同位置均表现出局部振动特性,顶板中心和翼板边缘最为显著;UHPC箱梁的局部振动较PC箱梁更剧烈;箱梁在特定速度下出现振动较大的现象,与桥面板局部振动模态和列车激励的高阶共振有关;PC箱梁的局部振动受第6和第7共振速度带影响较大,UPHC箱梁受第3、第6和第7共振速度带影响较大。Based on field test,the local vibration behavior of a 32 m simply-supported PC box girder under the excitation of high-speed train is analyzed.A coupled vehicle-railbridge vibration analysis model is established,the acceleration responses of the bridge at different locations are calculated,and the reliability of the model is verified by comparing with the measured results.The local vibration characteristics of a 56 m simply-supported UHPC box girder is studied by numerical methods,and the vibration responses of two types of bridges under different filtering conditions are compared.The influence of train speed on local vibration of the bridge is analyzed,and the mechanism of high-order resonance of the train and the bridge and its influence on the operation safety are discussed.The results show that the girders exhibit local vibration characteristics at different locations,with the top slab center and the flange edge being the most significant.The local vibration of the UHPC box girder is more intense than that of the PC box girder.The phenomenon that the box girder vibrates more prominently at specific speeds shall be related to the local vibration modes of the deck and the high-order resonance of the train excitations.The local vibration of the PC box girder is mainly influenced by the 6th and 7th resonant speed bands,while the UPHC box girder is mainly influenced by the 3rd,6th,and 7th resonant velocity bands.

关 键 词：高速铁路 UHPC箱梁 局部振动 高阶共振 行车安全性 

分 类 号：U238[交通运输工程—道路与铁道工程]