高速铁路系杆拱连续梁桥上钢轨伸缩量研究<sup>*</sup>

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摘要 研究目的: 为研究温度和活载作用对四线铁路系杆拱连续梁桥上钢轨伸缩量的影响,采用非线性杆单元模拟有砟轨道线路纵向阻力(该模拟方法已经过UIC774-3算例验证),建立考虑钢管混凝土拱、吊杆、梁体、支座、桥墩、桩基础、四线轨道结构、钢轨伸缩调节器的一体化空间分析模型,在此基础上分析多种钢轨伸缩调节器设置方案下钢轨应力和变形、墩顶水平力的分布规律,探讨拱、吊杆和主梁温度发生变化,以及多种制挠力组合工况对钢轨伸缩量和下部结构受力的影响。
研究结论: (1)将钢轨伸缩调节器设置在边跨跨中可保证钢轨伸缩量相对较小的情况下大幅度减少钢轨应力;(2)主梁温度变化对钢轨伸缩量影响显著,考虑拱温度变化后,钢轨应力可增大40 MPa; (3)制挠力对钢轨伸缩量的影响较小,多线加载时,有载和无载线路制挠力峰值均出现在路基相邻段; (4)多线对向加载时,在桥墩顶产生的扭矩可达8 033 kN·m; (5)本研究成果可为大跨度拱桥上轨道结构的设计提供借鉴和参考。

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	黄杰
	谢浩然
	刘从新
	闫斌

关键词 ：大跨度桥梁, 系杆拱连续梁, 无缝线路, 钢轨伸缩量

Abstract：Research purposes: In order to study the effect of temperature and live load on track expansion value on tied arch continuous bridge for four-line railway, the line resistance in ballast track was simulated with nonlinear bar elements (the method was already confirmed by UIC774-3 case), the integrated 3D model was established considering the concrete-filled steel tube arch, suspender, beam, bearing, pier, pile foundation, four-line track structure and track expansion device. Based on this, the distribution for track stress and deformation and pier-top horizontal force was analyzed in a variety of arrangements for track expansion devices. And it was explored that the arch, suspender and girder temperature variation, as well as combined cases of various braking bending forces made the impact on track expansion value and substructure.
Research conclusions: (1) Track expansion device is set at side span mid-span to be able to greatly reduce track stress in the case of relatively small track expansion value. (2) The temperature variation of girder has a significant effect on the track expansion value, and the track stress can increase by 40 MPa after considering arch temperature variation. (3) The effect of braking bending force on the track expansion value is less, and the braking bending force peaks of load and no-load line appear in adjacent embankment segments when considering the multi-line load. (4) At the time of multi-line face-to-face load, the torque generated at the top of the pier can reach 8 033 kN·m. (5) The research results can provide a reference for the design of track structures on long-span arch bridges.

Key words： long-span bridge tied arch continuous bridge continuous welded rail track expansion value

收稿日期: 2022-01-10

PACS:

U213.9

基金资助:国家自然科学基金面上资助项目(52278470); 湖南省自然科学基金资助项目(2022JJ30741)

作者简介: **黄杰, 1995年出生, 男, 工程师。

引用本文:

黄杰, 谢浩然, 刘从新, 闫斌. 高速铁路系杆拱连续梁桥上钢轨伸缩量研究^*[J]. 铁道工程学报, 2023, 40(3): 27-32.
HUANG Jie, XIE Haoran, LIU Congxin, YAN Bin. Research on the Track Expansion Value on Tied-arch Continuous Bridge for High-speed Railway. Journal of Railway Engineering Society, 2023, 40(3): 27-32.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I3/27

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