摘要
悬索桥跨越能力强,是大跨桥梁首选桥型之一,但其结构柔、变形大,而铁路桥梁行车安全性、舒适性要求高,需要的结构刚度大,大跨公铁悬索桥一些关键技术参数尚待研究。依托甬舟铁路跨海桥梁工程,对1500m跨度公铁悬索桥关键结构参数进行研究,对公铁悬索桥跨越能力、经济适用性进行初步分析,可为大跨公铁桥梁建设提供一定参考。研究表明:矢跨比、主梁及主塔刚度对大跨悬索桥结构刚度影响较小,恒活比对悬索桥竖向刚度影响较大;根据主缆材料强度分析,目前工程可行的公铁悬索桥极限跨度为2200~3300m;公铁悬索桥上部结构延米造价与跨度近似呈线性关系。
The suspension bridge is one of the first selective bridge style for long-span bridges due to its strong crossing capability.However,suspension structure is flexible and has large deformation.Meanwhile,railway bridges have high requirements for traffic safety and comfortability and require higher structural stiffness.The key parameters of long-span rail-road suspension bridge need to be studied.Based on the marine bridge project of Ningbo-Zhoushan Railway,some key structural parameters of 1500 m main span rail-road suspension bridge are studied,and the crossing capability and economic applicability of the rail-road suspension bridge are preliminarily analyzed to provide some reference for the construction of long-span rail-road bridges.The results show that the rise to span ratio,the stiffness of main girder and tower have little influence on the structural stiffness of long-span suspension bridge;while,the ratio between live load and dead load has a significant impact on the vertical stiffness of long-span suspension bridge.According to the strength analysis of main cable materials,the applicable limit span of rail-road suspension bridge is about 2200~3300 m.There is an approximate linear relationship between the cost of upper structures of railway suspension bridge and the span.
作者
王志平
WANG Zhiping(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;China Railway Construction Bridge Design and Research Branch,Wuhan 430063,China;China Railway Construction Laboratory of Bridge Engineering,Wuhan 430063,China)
出处
《铁道标准设计》
北大核心
2020年第S01期69-73,109,共6页
Railway Standard Design
基金
中国铁路总公司科技研究计划重点课题(2018G033)
中铁第四勘察设计院集团有限公司科技研究开发计划项目(2020K008,2020K011)。
关键词
公铁悬索桥
结构参数
结构刚度
恒活比
极限跨度
造价
rail-road suspension bridge
structural parameters
structural stiffness
ratio between live load and dead load
ultimate span
cost
