门式钢桥塔涡激振动特性及机理研究

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Abstract The steel bridge tower is one kind of tall and slender structure which is highly sensitive to wind loads and prone to vortex-induced vibrations (VIVs). To investigate the VIV characteristics of a 217-meter-high steel bridge tower, 1:100 scale free-standing aeroelastic model wind tunnel tests were conducted. The experimental results show that in-phase VIVs occur in the low wind speed ranges, and out-of-phase VIVs occur in the high wind speed ranges at the wind directions range of 0° - 30°. The most unfavorable wind directions of in-phase and out-of-phase VIVs are 0° and 10°, respectively. In-phase along-wind displacement and out-of-phase torsion angle are 609.5 mm and 4.3°, respectively. Furthermore, the VIV triggering mechanisms were studied by computational fluid dynamics (CFD). The numerical simulation results show that the frequency of alternating vortex shedding near the two tower columns is close to the fundamental natural frequency, and the periodic pressure difference generated by this phenomenon leads to in-phase and out-of-phase VIVs. The findings and conclusions of this study provide some reference for the wind-resistant design of similar steel bridge towers.

Key words： vortex-induced vibrations steel bridge tower wind tunnel tests numerical simulations

Received: 20 June 2023 Published: 28 May 2024

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	Articles by authors
	LEI Wei1
	2
	WANG Qi1
	2
	LIAO Haili1
	2
	LI Zhiguo1
	2

Cite this article:

LEI Wei1,2,WANG Qi1, et al. Vortex-induced vibration characteristics and mechanisms of portal steel bridge tower[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(10): 1-8.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I10/1

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