温度历程对斜拉桥上无缝线路纵向力的影响

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Abstract Research purposes: Temperature is the main factor of longitudinal force of CWR on long-span cable-stayed bridge. The action characteristics of temperature have obvious time-varying characteristics, the stress and deformation of CWR on the bridge is in dynamic change. According to the characteristics of structural temperature from construction locking to opening operation stage, considering the hysteretic constitutive relation of CWR longitudinal resistance, a spatial coupling finite element model of CWR on cable-stayed bridges with thousand-meter-scale main span is established, and the mechanical characteristics and deformation law of CWR under different temperature loading process are analyzed.
Research conclusions: (1) In the process of temperature "loading-unloading-reverse loading", the line longitudinal resistance enters the plastic state, and there is still residual longitudinal deformation after temperature unloading, and there is residual additional force inside the rail. (2) In the process of temperature cyclic loading, the residual deformation of beam-rail can offset part of the relative displacement of beam-rail under reverse loading, thereby reducing the longitudinal resistance of the line. The unrecoverable longitudinal residual deformation of rail and bridge occurs after temperature unloading. (3) Considering the temperature loading process, compared with the traditional single full amplitude loading, the peak value of rail longitudinal force can be reduced by 14.57 % without rail expansion joints (REJ) and that for beam-rail relative displacement can be increased by 46.28%. (4) After installing the REJ, the peak value of rail longitudinal force could be reduced by 11.4 %, and the beam-rail relative displacement peak value could be increased by 52.4 % with considering the temperature cyclic loading process, but the peak value is relatively small. (5) The research results can provide theoretical reference for the design and operation of CWR on long-span cable-stayed bridge.

Key words： cable-stayed bridges continuous welded rail hysteretic characteristics longitudinal force residual deformation

Received: 09 March 2021

PACS:

U213.9+1

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	Articles by authors
	CAI Xiaopei
	GAO Zihang
	ZHANG Qian
	XIE Kaize

Cite this article:

CAI Xiaopei,GAO Zihang,ZHANG Qian, et al. Influence of Temperature Loading Process on Longitudinal Force of CWR on Cable-stayed Bridges[J]. Journal of Railway Engineering Society, 2023, 40(7): 20-26.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I7/20

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