以疲劳评估为目标的大跨钢箱梁桥车桥耦合动力分析方法

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Abstract Taking the cable-stayed bridge of Runyang Yangtze River Highway Bridge at the north branch as an engineering background, based on the finite element software ANSYS and the numerical calculation software MATLAB, a series of technical problems in the vehicle-bridge coupling dynamic analysis of long-span steel box-girder bridges were discussed, which include the vehicle-bridge coupling vibration modeling method and dynamic stress analysis method aiming at fatigue analysis, the fatigue evaluation method based on vehicle-bridge coupling dynamic stress, the comparison of different bridge stress analysis methods, and the influence of road roughness on the fatigue condition of the bridge.The results show that the coupled dynamic analysis method can be effectively applied to the fatigue state assessment of long-span steel box-girder bridges, and can meet the need of local fatigue damage cumulative simulation.By comparing the dynamic stresses by using different calculation methods and different road roughness, it is shown that the effect of vehicle load on bridge is local but has a significant effect on the local fatigue accumulation.More accurate results can be obtained by the use of vehicle-bridge coupling dynamic analysis in bridge fatigue condition evaluation.

Key words： long-span cable-stayed bridge fatigue assessment vehicle-bridge coupled vibration road surface roughness

Received: 16 October 2018 Published: 15 March 2020

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	FAN Chen
	WANG Ying
	LI Zhaoxia

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FAN Chen,WANG Ying,LI Zhaoxia. Vehicle-bridge coupling dynamic analysis method for the fatigue assessment of a long-span steel box-girder bridge[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(6): 236-242.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I6/236

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