400 km/h速度下轨道-桥梁振动响应与顶板裂缝深度影响  

Vibration response of track-bridge system and effects of crack depth at bridge top slab under a train speed of 400 km/h

作　　者：孟鑫 高浩 刘鹏辉 勾红叶[3] 王一干 杨宜谦 MENG Xin;GAO Hao;LIU Penghui;GOU Hongye;WANG Yigan;YANG Yiqian(Railway Engineering Research Institute,China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China;State Key Laboratory of High Speed Railway Track System,Beijing 100081,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081 [3]西南交通大学土木工程学院,成都610031

出　　处：《振动与冲击》2025年第3期91-98,共8页Journal of Vibration and Shock

基　　金：中国铁道科学研究院集团有限公司科研项目(2021YJ058,2024YJ296)。

摘　　要：为探究400 km/h列车激励下高速铁路轨道-桥梁结构的振动响应,以某高铁桥梁为研究对象,在钢轨、桥梁、桥墩位置布置竖向加速度传感器,实测轨道-桥梁结构在多级速度作用下加速度的变化规律;在此基础上,借助于结构声强理论和车-轨-桥耦合振动仿真分析,从能量和加速度的角度掌握了顶板下缘裂缝深度的影响程度。研究结果表明:在高速列车激励下,实测钢轨、桥梁顶板和桥墩的加速度峰值分别为800 m/s^(2)、4 m/s^(2)和0.5 m/s^(2);振动加速度数值从钢轨到桥墩层层递减,随着列车速度的增大各测点加速度峰值呈线性增加;裂缝的出现会增大桥梁顶板下缘的加速度峰值,改变振动能量的分布;当裂缝深度大于45 mm时,顶板下缘加速度和振动能量值分别为无裂缝工况下的1.1倍和1.5倍,应注意加强对裂缝状态的观测。该研究成果可以为车-轨-桥耦合分析提供依据,也可以为高速铁路简支箱梁顶板下缘开裂维修提供指导。Here,to investigate vibration response of high-speed railway track-bridge structure under 400km/h train excitation,a certain high-speed railway bridge was taken as the study object,vertical acceleration sensors were arranged at positions of steel track,bridge and bridge pier to measure acceleration variation law of the track-bridge structure under multi-level speed action.Then,using the structural sound intensity theory and train-track-bridge coupled vibration simulation analysis,effects of crack depth at bridge top slab lower edge were clarified from the perspectives of energy and acceleration.The study results showed that under excitation of high-speed train,the measured peak accelerations of steel track,bridge top slab and bridge pier are 800 m/s^(2),4 m/s^(2) and 0.5 m/s^(2),respectively,these acceleration values decrease layer by layer from steel track to bridge pier,and peak acceleration values at various measured points increase linearly with increase in train speed;appearance of cracks can increase peak acceleration of bridge top slab lower edge and change distribution of vibration energy;when crack depth is larger than 45 mm,acceleration and vibration energy values at bridge top slab lower edge are 1.1 times and 1.5 times those under no crack working condition,respectively,attention should be paid to strengthening observation of crack state;the study results can provide a basis for coupling analysis of vehicle-track-bridge,and also provide a guidance for cracking repair at top slab lower edge of simply supported box girder of high-speed railway bridge.

关 键 词：轨道-桥梁响应 车-轨-桥耦合分析 结构声强 振动能量 裂缝 

分 类 号：TB122[理学—工程力学] U24[理学—力学] U238[交通运输工程—道路与铁道工程]