基于行车平稳性的大跨度铁路桥梁成桥线形评价方法研究  

Research on Evaluation Method of Completed Bridge Alignment of Long-span Railway Bridges Based on Riding Quality

作　　者：陆粤 王铭[1,3] 陈嵘[1,2] 李小珍[1,3] 王平[1,2] LU Yue;WANG Ming;CHEN Rong;LI Xiaozhen;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》2024年第6期44-51,共8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：超大跨度铁路桥梁成桥线形较设计线形易出现较大偏差,导致原轨面设计线形无法实现,通常需基于成桥线形变更轨面线形设计。为保障铺出的轨面线形满足行车性能的要求,在铺轨前合理评价大跨度铁路桥梁成桥线形尤为重要。基于实测成桥线形的特征分析,结合桥上有砟道床的可调整能力,提出一种基于行车平稳性的大跨度铁路桥梁成桥线形评价方法,并将车体敏感波长范围的成桥线形幅值作为评价指标。以线路随机不平顺、桥梁受载附加变形及轨面线形引起的车体垂向加速度不超Ⅰ级管理标准为评价原则,确定车体敏感波长范围轨面线形的加速度容许值;研究车体加速度与弦测幅值、弦测幅值与线形幅值的相关性,确定车体敏感波长范围轨面线形的幅值限值;通过推导车体敏感波长范围轨面线形和成桥线形的幅值对应关系,最终制定评价指标限值。结合国内某千米级悬索桥的工程实例,确定评价指标限值为58 mm,该桥车体敏感波长范围实测成桥线形幅值最大值为36 mm,未超限值,表明成桥线形控制效果良好,在满足桥上道床厚度要求的前提下,基于成桥线形能够铺出满足行车平稳性的轨面线形。The completed bridge alignment of super long-span railway bridges is prone to large deviation from the design alignment,which leads to the unrealization of the original rail surface design alignment,and it is usually necessary to change the rail surface alignment on the basis of the completed bridge alignment.In order to ensure that the changed rail surface alignment meets the requirements of train operation performance,it is particularly important to reasonably evaluate the completed bridge alignment of long-span railway bridges before laying the track.In this paper,the characteristics of the measured completed bridge alignment of a long-span railway bridge in China are analyzed.Combined with the adjustable capacity of ballast bed on the bridge,an evaluation method of completed bridge alignment of long-span railway bridges based on riding quality is proposed,and the amplitude of completed bridge alignment within the sensitive wavelength range of the vehicle body is taken as the evaluation index.Firstly,according to the evaluation principle that the vertical acceleration of vehicle body caused by line random irregularity,additional deformation of bridge under external loads and rail surface alignment does not exceed level I management standard,the maximum acceleration caused by rail surface alignment within the sensitive wavelength range of vehicle body is determined.Then the correlation between vertical acceleration of vehicle body and chord measurement amplitude,and the correlation between chord measurement amplitude and linear amplitude are studied to determine the maximum amplitude of rail surface alignment within the sensitive wavelength range of vehicle body.Finally,by deducing the correspondence between rail surface alignment amplitude and completed bridge alignment amplitude within the sensitive wavelength range of the vehicle body,the limit value of the evaluation index is formulated.Taking a kilometer-level suspension bridge in China as an example,the limit value of the evaluation index is determined to

关 键 词：铁路桥 大跨度桥 成桥线形 行车平稳性 敏感波长 

分 类 号：U24[交通运输工程—道路与铁道工程] U442.5[建筑科学—桥梁与隧道工程] U448.13