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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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

Received: 10 January 2022

PACS:

U213.9

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	Articles by authors
	HUANG Jie
	XIE Haoran
	LIU Congxin
	YAN Bin

Cite this article:

HUANG Jie,XIE Haoran,LIU Congxin, et al. Research on the Track Expansion Value on Tied-arch Continuous Bridge for High-speed Railway[J]. Journal of Railway Engineering Society, 2023, 40(3): 27-32.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I3/27

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