成贵铁路菜坝岷江大桥主桥桁式比选  

The Comparison of Truss Scheme for the Main Bridge of CaibaMinjiang Bridge on Chengdu-Guiyang Railway

作　　者：陈建峰[1] 鄢勇[1] 袁明[1] 向律楷[1] CHEN Jianfeng;YAN Yong;YUAN Ming;XIANG Lükai(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道标准设计》2020年第S01期125-127,共3页Railway Standard Design

基　　金：中国铁路总公司科技研究开发计划重大课题(2017G006-B);中国中铁股份有限公司科技研究计划重点课题(2014-重点-01)。

摘　　要：受桥位、通航净空、航空限高等因素控制,成贵铁路菜坝岷江特大桥主桥采用(140+224+140)m下承式连续钢桁梁。提出平行弦支点加劲、下弦曲线变高两种桁式方案,并进行综合比选,分别比较两个方案在外观、构造、制造和安装方面的优缺点,再从结构受力上进行比较。大桥推荐采用上弦平行、下弦曲线变高的桁式方案,该桁式为我国铁路桥梁首次采用。Due to navigation clearance and aviation height limit of the bridge site,(140+224+140)m lower deck bearing continuous steel truss is adopted for the main bridge of CaibaMinjiang Bridge on Chengdu-Guiyang Railway.In this paper,two schemes,including the parallel chord with fulcrum stiffening and lower chord curve truss,are proposed,and the advantages and disadvantages of the two schemes in appearance,construction,manufacture and installation are compared respectively,and the structural force bearing are also compared.According to the research,the main truss with parallel upper truss and lower chord curve truss is adopted for the bridge,which is the first application in China’s railway bridge.

关 键 词：高速铁路 铁路桥 钢桁梁桥 连续梁 曲弦变高 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.211[交通运输工程—道路与铁道工程]