大跨度铁路混凝土部分斜拉桥设计参数研究

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摘要 研究目的: 随着我国铁路特别是高速铁路快速发展,大跨度铁路混凝土部分斜拉桥应用越来越广,如主跨220 m的商合杭铁路颍上特大桥、主跨240 m的黔张常铁路阿蓬江特大桥以及主跨288 m的福平铁路乌龙江特大桥等。通过对国内外大跨度部分斜拉桥设计参数的分析研究,结合关键设计参数对力学性能的影响,提出大跨度铁路混凝土部分斜拉桥关键设计参数的合理取值。
研究结论: (1)大跨度铁路混凝土部分斜拉桥设计时应因地制宜选择合适的结构体系,以降低结构变形,减少养护维修工作量,提高行车舒适性;(2)铁路部分斜拉桥桥面以上塔高与跨度比宜取1/8～1/10;(3)铁路部分斜拉桥的支点梁高宜取跨度的1/18～1/20,跨中梁高与支点梁高之比宜采用0.45～0.6;(4)铁路部分斜拉桥拉索安全系数建议不小于2.0;(5)本研究结论可为铁路桥梁设计提供参考。

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	孙宗磊
	周岳武

关键词 ：铁路, 混凝土梁, 部分斜拉桥, 设计参数

Abstract：Research purposes: With the rapid development of my country′s railways, especially high-speed railways, long-span railway concrete extradosed bridges have become more widely used. For example, the Yingshang Bridge on Shangqiu-Hefei-Hangzhou Railway with a main span of 220 meters, the Apengjiang Bridge on Qianjiang-Zhangjiajie-Changde Railway with a main span of 240 meters, and the Wulongjiang River Bridge on Fuzhou-Pingtan Railway with a main span of 288 meters. Through the research on the design parameters of long-span extradosed bridges at home and abroad, and combined with the impact of key design parameters on mechanical properties, the reasonable values of key design parameters are proposed.
Research conclusions: (1) Appropriate structural systems for long-span railway concrete extradosed bridge should be selected according to local conditions to reduce structural deformation, maintenance and repair, and improve driving comfort; (2) The height-to-span ratio of pylon above the bridge deck and main girder for railway extradosed bridge should be 1/8～1/10; (3) The fulcrum depth-to-span ratio of main girder for the railway extradosed bridge should be 1/18～1/20, and the ratio of the mid-span beam height to the fulcrum beam height should be 0.45～0.6; (4)The stay cable safety factor of the railway extradosed bridge is recommended to be no less than 2.0; (5)The research conclusions can provide references for the design of railway bridges.

Key words： railway concrete beam extradosed bridge design parameter

收稿日期: 2021-02-22

PACS:

U24

基金资助:中国铁路总公司科技研究开发计划重点课题(2016G002-Ⅰ)

作者简介: 孙宗磊,1974年出生,男,正高级工程师;^**周岳武,1982年出生,男,高级工程师。

引用本文:

孙宗磊, 周岳武. 大跨度铁路混凝土部分斜拉桥设计参数研究[J]. 铁道工程学报, 2022, 39(3): 50-54.
SUN Zonglei, ZHOU Yuewu. Research on the Design Parameters of Long-span Railway Concrete Extradosed Bridge. Journal of Railway Engineering Society, 2022, 39(3): 50-54.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I3/50

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