既有线列车荷载下大悬臂转体桥动力响应研究

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Abstract Research purposes: With the further advancement of China's strategy to become a transportation powerhouse, the proliferation of intersecting routes in transportation infrastructure is on the rise, and the construction method of rotating bridge structures is becoming increasingly prevalent. These rotating bridge are widely used in engineering projects across existing railway lines. However, there is currently a relative scarcity of research concerning the structural vibration spatial response patterns and transmission mechanisms of rotating bridges under the load of existing railway train traffic. Based on the Shizuishan Super-large Bridge (637#and 638#), this paper utilizes vibration acceleration sensors to conduct tests on the structural response data of rotating bridges under the sole contact of spherical hinges and in a state of large cantilever, and analyzes the dynamic acceleration response, dynamic displacement response, and the vibration Hilbert energy spectrum of the rotating bridge structure.
Research conclusions: (1)Under the normal speed train load of the existing line, the lower pile cap of the swivel bridge should reach the vertical acceleration peak point before the upper pile cap, and the peak value is greater than the upper pile cap.(2)The acceleration amplitude of the structure is amplified during the transmission from the bridge deck to the beam end of the swivel bridge, and the acceleration time-history curve will show "reciprocating" fluctuations, indicating that the vibration wave resonates with the natural frequency, and the acceleration response peak distribution curve is spatially "V" symmetrical distribution.(3)The dynamic vertical displacement response generated at the end of the bridge is relatively significant, and the peak vertical displacement responses at various measurement points along the beam exhibit a symmetric "W" shape distribution.(4)The swivel spherical hinge has obvious filtering and vibration reduction effect on the middle and high frequency bands of vibration waves.(5)The vibration wave has obvious standing wave effect at the beam end, and the vibration wave in the middle and high frequency bands attenuates rapidly. The vibration wave in the low frequency band is the main cause of the vibration of the rotating bridge beam.(6)The research results can provide a theoretical reference for the design and construction of swivel bridges near existing lines.

Key words： existing lines train loads swivel bridges Hilbert-Huang Transform structural response Hilbert energy spectrum

Received: 28 February 2023

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TU443

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	Articles by authors
	ZHAO Shouquan
	LIU Xu
	DOU Shun
	ZHU Hongxing
	YANG Xuehu
	HAN Kan

Cite this article:

ZHAO Shouquan,LIU Xu,DOU Shun, et al. Dynamics Response Study of Large Cantilever Concrete Swivel Bridge under Existing Railway Train Loads[J]. Journal of Railway Engineering Society, 2023, 40(11): 50-57.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I11/50

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