基于成桥施工偏差的大跨度铁路桥梁线路纵断面设计适应性分析  

Design Adaptability Analysis of the Route Longitudinal Section on Long-Span Railway Bridge Based on Construction Deviation

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

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]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 [3]西南交通大学桥梁工程系,成都610031

出　　处：《铁道标准设计》2023年第3期61-67,73,共8页Railway Standard Design

基　　金：国家自然科学基金面上项目(51778542);中央高校基本科研业务费专项资金(2682018CX01)。

摘　　要：大跨度铁路桥梁成桥线形与设计线形易产生偏差,通常需根据成桥线形变更线路纵断面;同时,大跨度铁路桥梁受荷载作用呈现明显的动态大变形特征,导致桥梁服役期间线路纵断面仍难以与设计纵断面匹配,影响其后续的线路养护维修。结合某大跨度公铁两用桥梁,介绍现有考虑成桥施工偏差的线路纵断面设计方法,并考虑温度、列车载重等常规荷载激励,开展基于中点弦测法的轨道几何形位评估和基于动力仿真的列车舒适性评价,以分析服役期间不同线路设计纵断面对桥梁线形变化的适应性。结果表明:降温导致跨中等效竖曲线半径减小,拟合调整大跨度桥梁线路纵断面时,应重点关注降温荷载对车辆运行平稳性的影响;桥梁结构整体受力变形所引起的车体垂向振动加速度变化不超过0.05 m/s^(2),线形平顺性主要由线路设计纵断面本身控制;相比多坡段纵断面,多项式拟合设计的线路纵断面消除了变坡点和竖曲线,从而减小线路纵断面引起的列车车体振动响应。The alignment of the long-span railway bridge is prone to deviation from the designed alignment,which often requires to change the designed route longitudinal section according to the bridge alignment.In addition,the alignment of the long-span railway bridge shows obviously large dynamic deformation characteristics under load,which makes it difficult to match the designed route longitudinal section during the service period of the bridge and affects its subsequent maintenance.Based on a long-span road-rail bridge project,this paper introduces the existing designed method of the route longitudinal section on long-span railway bridges.In order to analyze the adaptability of different designed route longitudinal section to bridge alignment changes during the service period,the track geometry evaluation based on the midpoint chord method and the train comfort evaluation based on dynamic simulation are carried out.The results show that cold load leads to a reduction in the radius of the vertical equivalent curve in the middle of the span;When fitting and adjusting the route longitudinal section of a long-span bridge,attention should be paid to the influence of the cold load on the vehicle smoothness;The change of vertical vibration acceleration of vehicle caused by deformation of the bridge structure itself does not exceed 0.05 m/s^(2);The ride comfort is mainly determined by the designed route longitudinal section of railway;Compared with the multi-slope longitudinal section,the route longitudinal section designed by polynomial fitting eliminates the slope point and the vertical curve,thereby reducing the vibration response of the train body caused by the route longitudinal section.

关 键 词：大跨度桥梁 铁路桥 线路纵断面 施工偏差 弦测法 竖曲线半径 车体振动加速度 

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