时速200 km城际铁路曲线简支梁桥横向偏心设置研究  

Study on Lateral Eccentricity Setting of Curved Simply Supported Beam of Intercity Railway with 200 km/h Speed

作　　者：宋威 Song Wei(China Railway Design Cooperation,TianJin 300300,China)

机构地区：[1]中国铁路设计集团有限公司,天津300300

出　　处：《铁道勘察》2020年第3期155-160,共6页Railway Investigation and Surveying

基　　金：中国铁路设计集团有限公司科技开发课题(7218135)。

摘　　要：就目前的普速铁路而言,双线简支梁桥下部结构横向偏心设置及适用曲线半径的设计与计算已比较成熟。对于城际铁路,设计曲线半径、设计活载、墩梁结构等均与普速铁路有较大区别,横向偏心如何设置以及偏心值与曲线半径如何匹配均有待研究。为了研究时速200 km城际铁路曲线简支梁桥下部结构横向偏心设置规律,以京津冀地区某城际铁路工程为背景,采用弯矩平衡方法推导出理想偏心值公式,通过对其桩长、承载力、经济性等指标的对比分析,得到适合工程实际的横向偏心设置方法。结果表明:桥墩与基础之间设置横向偏心形式与梁部与桥墩之间设置横向偏心均对桩基有优化效果,建议根据工程项目特点选择适当的方法;当线路平面采用最小曲线值(R=2000 m、2200 m)时,建议在双线简支梁桥设置0.2 m横向偏心,当曲线半径R>2000 m时,可不设置横向偏心。As far as the current normal speed railway is concerned,the design and calculation of lateral eccentricity setting and the applicable curve radius for the substructure of double-line simply supported beam are relatively mature.For the intercity railway,the design curve radius,the design live load,the pier beam structure,etc.are all different from the normal speed railway.How to set the lateral eccentricity and how to match the eccentricity value and curve radius need to be studied.In order to study the rule of lateral eccentricity setting of substructure of curved simply supported beam for intercity railway with 200 km/h speed,the formula of ideal eccentricity value is deduced by the method of moment balance,based on an intercity railway project in Beijing-Tianjin-Hebei region.Through the comparative analysis of pile length,bearing capacity,economy and other indexes,the method of setting lateral eccentricity which is suitable for engineering practice is obtained.The results show that the form of transverse eccentricity between the pier and the foundation and the form of transverse eccentricity between the beam and the pier have the optimization effect on the pile foundation,and it is suggested to choose the appropriate method according to the characteristics of the project;when the line plane adopts the minimum curve value(R=2000 m,2200 m),the lateral eccentricity of 0.2 m is set in double-line simply supported beam;when curve value R>2200 m,the lateral eccentricity of the pier could be no longer set.

关 键 词：城际铁路 曲线 简支梁 桩基础设计 横向偏心 适用范围 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.217[交通运输工程—道路与铁道工程]