大跨度铁路桥梁变形控制标准研究  

Research on Deformation Control Standard of Long-span Railway Bridge

作　　者：杨静静 高芒芒 赵文博 李国龙 王韫璐 蒙蛟 YANG Jingjing;GAO Mangmang;ZHAO Wenbo;LI Guolong;WANG Yunlu;MENG Jiao(Infrastructure Inspection Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Railway Design Group Co.,Ltd.,Tianjin 300251,China)

机构地区：[1]中国铁道科学研究院集团有限公司基础设施检测研究所,北京100081 [2]中国铁路设计集团有限公司,天津300251

出　　处：《铁道学报》2023年第3期137-143,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(52178101);中国国家铁路集团有限公司科技研究开发计划(K2021G020);中国铁道科学研究院集团有限公司科研项目(2021YJ084)。

摘　　要：为保证大跨度桥梁运行的安全性与旅客乘坐的舒适性,动力性能分析时应考虑风、温度、徐变、沉降等环境变形的影响。确定运营阶段多种荷载组合状态下的变形控制标准时,不能将现行设计规范中单独给定的变形限值直接叠加,而应对这些变形的总量值进行控制。本文按照发生概率、作用时间以及桥梁变形特点,对运营阶段桥梁承受的荷载及各类环境因素进行分组,并采用分级管理的原则对大跨度铁路桥梁在长期运营条件下的变形控制标准进行研究。最后以某大跨度斜拉悬吊桥梁为例,介绍动力性能评估与变形控制标准的工程应用。研究结果表明:对于不同荷载作用下的车辆响应,可分别采用车桥耦合动力分析与中点弦测法;采用中点弦测法对长波不平顺进行管理时,高速铁路与普速铁路的合理控制弦长分别为60、30 m;经过对多个典型路基区段轨道不平顺和车体加速度检测数据统计,并对轨道不平顺采用对应的弦长输出,可得到车体加速度与不平顺弦测输出的相关关系曲线,为动力性能评估提供一种简便的计算方法。研究成果给出不同的荷载组合及车辆响应建议限值,为设计阶段桥梁变形控制提供参考。The influence of environmental deformations such as wind,temperature,creep and settlement should be considered in the dynamic performance analysis,to ensure the running safety of long-span bridges and the riding comfort of passengers.During the determination of the deformation control standards under various load combinations during the operation stage,the deformation limits given separately in the current design specifications should not be directly superimposed,but the total value of these deformations should be controlled.According to the occurrence probability,action time and bridge deformation characteristics,the load and various environmental factors borne by the bridge in the operation stage were grouped in this paper,and the principle of hierarchical management was adopted to study the deformation control standard under long-term operation conditions.Finally,the case of a long-span cable-stayed suspension bridge was used to introduce the dynamic performance evaluation and the engineering application of the deformation control standard.The results show that the vehicle-bridge coupling dynamic analysis and the midpoint chord measurement method can be respectively adopted for vehicle responses under different loads.The reasonable management chord lengths of long-wave track irregularity based on the midpoint chord measurement method are respectively 60 m and 30 m for high speed railway and conventional speed railway.Through the statistics of track irregularity and car-body acceleration detection data from multiple typical subgrade sections,the correlations between car-body accelerations and output irregularities of corresponding chord length are obtained,which is a simple method to evaluate the dynamic performance.The research results suggest the different load combinations and the corresponding vehicle response limits,which can provide reference for bridge deformation control in design stage.

关 键 词：大跨度铁路桥梁 变形控制 分级管理 车桥耦合动力分析 中点弦测法 

分 类 号：U24[交通运输工程—道路与铁道工程]