不同荷载图式作用下桥上无缝线路纵向力研究  

Study on Longitudinal Forces of Continuous Wield Rail on Bridges Considering Different Load Diagrams

作　　者：陈浩瑞 胡所亭 班新林 CHEN Haorui;HU Suoting;BAN Xinlin(Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院研究生部,北京100081 [2]中国铁道科学研究院集团有限公司,北京100081 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2020年第2期9-13,共5页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(N2018G032);中国铁道科学研究院集团有限公司基金(2018YJ028);铁路工程建设标准编制课题(2017BZ015,2018BZ016)。

摘　　要：2016年客货共线设计活载采用ZKH荷载图式代替了中-活载图式,其与ZK荷载图式存在明显差异,但两者作用下的无缝线路纵向力差异鲜有研究。建立有砟轨道单线简支梁线桥模型,对比分析了ZK,ZKH荷载图式作用下的无缝线路纵向力,研究了荷载图式变化对无缝线路纵向力的影响,并对建议的墩顶线刚度限值进行探讨。研究结果表明:ZK荷载图式作用下的无缝线路纵向力明显小于ZKH荷载图式,不同荷载图式引起的无缝线路纵向力差别受桥梁跨度影响不大,荷载图式作用下的无缝线路纵向力与图式竖向荷载基本呈线性关系。设计活载较大的线路对应的墩顶纵向线刚度限值也越大。In 2016,the design live load of mixed passenger and freight railway replaced the China-live load diagram with the ZKH load diagram.There was a significant difference between the ZKH load diagram and the ZK load diagram,but the difference in longitudinal forces generated by them was rarely studied.In this paper,an analytical model of a simply supported bridge with ballast track and continuous wield rail was established.Based on the above model,the longitudinal forces of continuous wield rail generated by the ZK load diagram and the ZKH load diagram were analyzed and compared.The influence of changes of load diagram on longitudinal forces of continuous wield rail were studied.The suggested limits of stiffness at the pier top were discussed.The research shows that the longitudinal forces of continuous wield rail generated by the ZK load diagram is smaller than that generated by ZKH load diagram obviously.The difference of longitudinal forces caused by different load diagrams is not influenced by the bridge span greatly.The longitudinal forces of continuous wield rail generated by the load diagram are proportional to the load value of the load diagram.The greater limit of longitudinal stiffness at the pier top corresponds to the line with the larger design live load.

关 键 词：客货共线铁路 高速铁路 纵向力 理论分析 无缝线路 荷载图式 

分 类 号：U213.9[交通运输工程—道路与铁道工程]