高速铁路300 m以上跨度桥梁线形评价标准研究  

Research on the Evaluation Standard of the Profile of High Speed Railway Bridges of Over 300 m Span

作　　者：刘超[1,2] 魏周春 张岷[1,2] 苏成光 LIU Chang;WEI Zhouchun;ZHANG Min;SU Chengguang(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China;Shaanxi Railway and Underground Traffic Engineering Key Laboratory(FSDI),Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]陕西省铁道及地下交通工程重点实验室(中铁一院),西安710043

出　　处：《铁道标准设计》2021年第9期62-67,共6页Railway Standard Design

基　　金：中铁第一勘察设计院集团有限公司科技开发课题(院科19-12)。

摘　　要：目前,既有研究对高速铁路大跨度桥梁结构的线形分析较少,且多选用跨中变形拟合竖曲线的方式进行平顺性评价。以百合郁江特大桥为例,结合现有研究成果和规范要求,采用数值计算,针对高速铁路300 m以上跨度桥梁线形超限问题开展研究。研究结论如下:(1)线形分析时应充分考虑各种荷载出现的概率,单项工况宜进行合理组合以真实模拟实际情况;(2)60 m弦测法、竖曲线半径评价法、舒适度评价法能够较好的对桥梁线形进行评价分析,百合郁江特大桥跨中位置均满足各项评价标准,平顺性较更佳;(3)极端静态工况作用时,双线列车同时经过跨中会造成墩台位置评价指标超限,应加强桥梁结构细部设计并在运营期加强墩台处变形监控;(4)桥梁发生最大竖向变形时,列车动力学响应较好,各项指标均满足行车需求。Presently,only a few of the existing researches are dedicated to the profile analysis of large span high speed railway bridges,and the smoothness is commonly evaluated by fitting the vertical curve with mid-span deformation.With reference to the Baiheyu extra-long bridge,this paper focuses on the over-limited profile of high speed railway bridges of 300m span by means of numerical calculation based on present researches and codes.Research results show that(1)the probability of various loads should be taken into consideration in the analysis of bridge profile;(2)60 m chord method,vertical curve radius evaluation method and smoothness evaluation method are effective in bridge profile accessing,and all mid span locations satisfy relevant standards and the smoothness is better than the pier location;(3)under the static working condition,the location assessment index may be over the limit while the double line trains are passing simultaneously the mid span,and detailed design of bridge structures should be addressed and the deformation of prier and abutment should be closely monitored during the service period;(4)in the case of maximum bridge vertical deformation,good train dynamic response is presented and all indicators meet the driving requirements.

关 键 词：高速铁路 大跨桥梁 60 m弦测法 竖曲线半径评价法 舒适度评价法 车-线-桥耦合 

分 类 号：U216.3[交通运输工程—道路与铁道工程] U238