超大跨度公铁悬索桥结构体系参数分析

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摘要研究目的:公铁合建悬索桥是大跨度海湾桥梁的优先选择，是经济与社会发展的需要。然而，超大跨度公铁悬索桥超出了目前的设计规范，并且还没有主跨超过2 000 m的悬索桥实例，一些关键技术有待研究。本文以某海湾双塔三跨悬索桥的可行性研究为背景，分析了主要设计参数对结构体系的影响规律，为今后的理论研究和工程设计提供参考。

研究结论:（1）合理的主缆边中跨比为0.22-0.33，合理的加劲梁边中跨比为0.05-0.10; （2）加大加劲梁恒载对结构体系的竖向和横向刚度均有较大的改善，但是以增加主缆量为代价;(3)增加列车长度，有利于使主缆受力均匀，不至于加劲梁局部变形过大;(4)减小主缆矢跨比，有利于提高结构的刚度，但主缆轴力与锚旋规模相应增大，需综合考虑;(5)本文分析归纳的-般性规律，对类似超大跨度桥梁具有参考价值。

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	罗世东
	夏正春
	严爱国

关键词 ：公铁合建, 悬索桥, 超长大跨, 设计参数

Abstract：Research purposes: The combined highway and railway bridge is a preferred choice for large span bay bridge，is also the needs of economic and social development. But，super long-span highway-railway suspension bridge is beyond the current design codes，and so far there is no the project instance which main span exceeds 2 000 m. Therefore，further studies are needed on some key technologies. Taking the feasibility study of a bay twin towers three span suspension bridge as the engineering background，this paper analyzes the effects of main design parameters on the suspension structure，which provide reference for theory research and engineering design in the future.

Research conclusions:(1)The reasonable side-middle span ratio of main cable is 0. 22-0. 33，and that of stiffened girder is 0.05-0.10. (2)The vertical stiffness and lateral stiffness can be improved through increasing the dead load of stiffened girder. ( 3)Increasing the train length can reduce the uneven force on the main cable， which avoid local large deflection of stiffened girder.(4)Reducing the rise-span ratio of main cable can improve the stiffness of the structure , but which led to increase the axis force of the main cable and the construction scale of the anchorage. (5)This paper concludes some rules and conclusions，which have valuable references to the similar super long-span bridge.

Key words： highway-railway bridge suspension bridge super long-span design parameters

收稿日期: 2013-12-30

PACS:

U448. 12 + 1

作者简介: 罗世东，1957年出生，男，教授级高级工程师

引用本文:

罗世东,夏正春,严爱国. 超大跨度公铁悬索桥结构体系参数分析[J]. 铁道工程学报, 2014, 31(6): 39-45.
LUO Shi-Bong，XIA Zheng-chun,Yan Ai-guo. Parameters Analysis of Structure System of Super Long-span Highway- Railway Combined Suspension Bridge. Journal of Railway Engineering Society, 2014, 31(6): 39-45.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2014/V31/I6/39

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