研究目的:宜城汉江特大桥为新建襄阳至荆门高速铁路的关键控制性工程,主桥采用2×200 m双主跨跨越汉江通航水域。通过研究主桥桥跨布置及支承体系,从技术性、经济性等方面综合比选斜拉加劲刚构连续梁和钢-混组合(混合)梁刚构连续梁两种桥式方案。
研究结论:(1)两种方案均为适用方案,斜拉加劲刚构连续梁方案在刚度条件、长期线形稳定性、技术成熟性、工程实践经验、维修养护和景观效果等方面有优势;(2)斜拉加劲刚构连续梁方案通过采用“高中塔、低边塔”的桥塔布置,保证合理结构受力并避免边支座负反力;(3)结构计算表明结构受力安全可靠,列车行车安全性、旅客乘坐舒适性均满足要求;(4)本设计成果可为类似铁路桥梁提供参考。
Abstract
Research purposes:Yicheng Hanjiang River Bridge is a key control project of the newly-built Xiangyang-Jingmen High-speed Railway. The main bridge uses double main spans of 2×200 m to cross the navigable waters of the Hanjiang River. After studying the bridge span layout and support system, the two bridge schemes, cable-stayed stiffened rigid frame continuous beam bridge and steel-concrete composite (hybrid) rigid frame continuous beam bridge, are comprehensively compared from the aspects of technology and economy.
Research conclusions:(1) The two schemes are applicable. The cable-stayed stiffening rigid frame continuous beam bridge scheme has advantages in stiffness condition, long-term geometry stability, technical maturity, engineering practice experience, maintenance and landscape effect, etc. (2) The cable-stayed stiffened rigid frame continuous beam bridge scheme, by adopting the layout of "high middle pylon, low side pylon", ensure the reasonable structural stress and avoid the negative reaction of side bearings. (3) The static calculation of the structure shows that the structure is safe and reasonable for loading. The safety of train operation and the comfort of passengers all meet the requirements. (4) The design results can provide reference for similar railway bridges.
关键词
高速铁路 /
刚构连续梁 /
钢-混结合梁 /
高低塔 /
方案比选 /
设计
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Key words
high-speed railway /
rigid frame continuous beam /
steel-concrete composite beam /
high and low pylons /
scheme comparison /
design
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中图分类号：
U238
U448.13
U448.27
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参考文献
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[5] 林骋. 常益长铁路沅江特大桥(34+118+240+118+34)m矮塔斜拉桥设计[J]. 铁道标准设计,2020(9):70-74.
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Nie Jianguo. Steel-concrete Combination Structure Bridge [M]. Beijing: China Communications Press,2011:1-8.
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脚注
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基金
中铁第四勘察设计院集团有限公司科技研发项目(2021K013)
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