基于车体加速度的超大跨度桥上线路纵断面优化方法  

Optimization Method of Railway Profile on Super Long-span Railway Bridge Based on Vehicle Acceleration

作　　者：舒英杰 王铭[2,3] 陆粤 禹壮壮 陈嵘[1,2] 王平[1,2] SHU Yingjie;WANG Ming;LU Yue;YU Zhuangzhuang;CHEN Rong;WANG Ping(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031 [3]西南交通大学桥梁工程系,成都610031

出　　处：《铁道标准设计》2024年第4期35-41,共7页Railway Standard Design

基　　金：四川省杰出青年科技人才项目(2020JDJQ0033);中国博士后科学基金项目(2021M702717)。

摘　　要：合理的线路纵断面是高速列车安全平稳通行的必要条件。超大跨度铁路桥梁成桥线形较设计线形易出现较大偏差,由于线路调整能力有限,桥上线路纵断面难以达到设计高程,故需在成桥线形基础上变更线路纵断面设计。在满足道床厚度要求的前提下,变更后的纵断面线形难以满足线路设计规范要求,严重影响了工程验收及列车达速运营。为此,以实测桥梁线形为基准,充分考虑道床厚度及线路衔接,依据傅里叶级数原理建立线路线形频域特征与车体加速度的关联关系,进而构建纵断面目标优化模型,提出一种适用于超大跨度铁路桥上线路纵断面的优化方法。以某超大跨度悬索桥为例,研究结果表明:该方法可使线路纵断面的最小波长远离车体加速度敏感波长,降低车体振动加速度;优化后的线路纵断面车体加速度响应最大值为0.15 m/s2,优于工程实际中所采用的多坡段纵断面;优化后的线路纵断面具有良好的平顺性及适应性。本方法可直观反映优化后线路纵断面的频域特性,并从波长的角度实现了纵断面优化与高速列车行车性能的关联,可用于指导桥上线路纵断面设计及优化。A reasonable railway profile is a necessary condition for the safety and the stability of high-speed trains.The completed alignment of super long-span railway bridge is prone to large deviation from the design alignment.And due to the limited railway line adjustment capacity,the railway profile on the bridge is difficult to reach the design elevation,so the design of the longitudinal section of the railway on the bridge needs to be changed on the basis of the completed bridge alignment.On the premise of meeting the requirements of ballast bed thickness,the changed railway vertical alignment is difficult to meet the requirements of railway line design code,which seriously affects the project acceptance and train high-speed operation.Therefore,this paper takes the measured bridge alignment as the benchmark,fully considers the ballast bed thickness and line connection,establishes the correlation between the frequency domain characteristics of the railway line and the vehicle acceleration according to the principle of Fourier series,and then constructs the railway profile objective optimization model.Finally an optimization method for the railway vertical alignment on the super long-span high-speed railway bridge is presented.This method has been applied to optimize the railway profile on a super long-span suspension bridge.Results indicate that this method can make the minimum wavelength of the optimized line longitudinal section far away from the vehicle body acceleration sensitive wavelength,which reduces the vehicle body vibration acceleration;the maximum acceleration response of vehicle body in optimized line longitudinal section is 0.15 m/s2,which is better than the multi-slope line longitudinal section used in the actual project;the optimized line longitudinal section has good smoothness and adaptability.This method can also directly reflect the frequency domain characteristics of the optimized profile,realize the correlation between the design of railway profile and the running performance of high-speed train

关 键 词：超大跨度桥梁 铁路桥 线路纵断面 目标优化 车体加速度 傅里叶级数 

分 类 号：U212.34[交通运输工程—道路与铁道工程] U448.13[建筑科学—桥梁与隧道工程]