考虑车桥耦合效应的大跨悬索桥钢-混组合梁疲劳损伤评估

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Abstract In order to study the fatigue life of steel-concrete composite beams of long-span suspension bridges under different fatigue vehicle loads and the cumulative variation of fatigue damage during operation period considering the change of vehicle-bridge coupling effect. Taking a suspension bridge with a main span of 720 meters as the engineering background, the fatigue details are determined based on the static analysis of the finite element model of the local beam section, and the corresponding stress concentration factor is obtained. Then the fatigue damage degree and fatigue life of fatigue load model III, AASHTO standard fatigue vehicle and Hebei Province fatigue load spectrum are evaluated by using P-M and CDM evaluation models. Finally, considering the vehicle-bridge coupling dynamic effect, the effects of vehicle load, vehicle speed, deck pavement deterioration and future traffic growth on fatigue damage accumulation during the operation period of the structure are analyzed. The results show that the most disadvantageous section for fatigue assessment of steel-concrete composite beams is 1/8 span, and the joints prone to fatigue damage are the joints of the main girder roof and web near the suspension point. Fatigue load model III is close to the fatigue damage under local fatigue load spectrum, and the damage accumulation under AASHTO fatigue vehicle is significantly lower than that under the other two categories. The relationship between cumulative damage change trend and speed of fatigue details in different parts is not clear. The cumulative increase of fatigue damage is accelerated by the increase of vehicle load, traffic volume and deterioration of bridge deck pavement.

Key words： Suspension bridge Steel-concrete composite beam Vehicle-bridge coupling effect Fatigue damage assessment influence factor

Received: 09 September 2019 Published: 15 March 2021

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	Articles by authors
	ZHU Jinsong1
	2
	XIANG Chao1
	QI Haidong3

Cite this article:

ZHU Jinsong1,2,XIANG Chao1, et al. Fatigue damage evaluation of steel-concrete composite beam of long-span suspension bridge considering vehicle-bridge coupled effect[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(5): 218-229.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I5/218

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