一次强风作用下大跨度桥梁主梁非平稳抖振可靠性分析

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Abstract Buffeting reliability assessment is of vital importance to the safety insurance of long-span bridges under strong winds. A comprehensive nonstationary buffeting reliability analysis approach for the long-span bridge girder is proposed based on the nonstationary wind field model and the refined time-domain buffeting analysis process, considering the nonstationary and non-Gaussian characteristics of the buffeting response as well. The non-stationary fluctuating wind speed is simulated by combining the Weighted Amplitude Wave Superposition (WAWS) method and uniform modulation model based on the evolutionary spectrum theory. The static wind force is computed by the design code. The non-stationary buffeting force is obtained by the quasi-steady aerodynamic theory with the aerodynamic admittance formula for error correction consideration. The aerodynamic self-excited force is realized by introducing the aerodynamic stiffness and damping matrixes. Gaussian translation is applied on the buffeting response obtained from the refined finite element analysis using the Winterstein model. The dynamic reliability of nonstationary buffeting is obtained by the first overpass probability based on the Poisson assumption and the time-variant property of the response variance is considered. The proposed methodology is applied to evaluate the buffeting reliability of a long-span cable-stayed bridge under strong wind as a case study.

Key words： long-span bridge nonstationary wind effect girder buffeting dynamic reliability time-domain analysis

Received: 08 March 2023 Published: 15 April 2024

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	Articles by authors
	SUN Bo1
	YE Zeyi1
	RUAN Weidong1
	ZHANG Xinjun1
	YANG Mingguan2

Cite this article:

SUN Bo1,YE Zeyi1,RUAN Weidong1, et al. Reliability analysis of non-stationary buffeting of large-span bridge girder under a strong wind action[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 144-154.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/144

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