Evaluation of the reinforcement scheme for a long-span curved truss bridge based on vehicle-bridge coupled vibration analysis

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (14) : 199-209.

WANG Yan1,LIU Zhe1,ZHOU Ruijiao1,CHEN Huai1,ZHAO Zhiyou2

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Abstract

In order to evaluate the reinforcement scheme of the curved truss bridge in service, the Rainbow Bridge with span of 122m was taken as the engineering background, the vehicle-bridge coupled vibration analysis of the in-service curved truss bridge and its reinforcement scheme were carried out, based on the vehicle-bridge coupled vibration analysis method which can consider the period of vehicle jumping. The reinforcement effect of bridge were evaluated by calculating dynamic performance indexes of the bridge and the reinforcement scheme, including the frequency and mode shape, displacement and impact factors, the value of peak acceleration, comfortability and so on, and the evaluation indexs of applicability were also discussed. The results show that the integral vertical and torsional stiffness of the bridge reinforcement scheme is obviously higher than that of the original bridge, and the vertical stiffness of the bridge deck is significantly improved; the dynamic response, impact factors and vibration degree of the bridge reinforcement scheme are effectively reduced under the action of the vehicle dynamic loads , and there is a good comfortability for pedestrian; the evaluation method of allowable acceleration could well reflect the vibration degree of the bridge, and could be used to evaluate the dynamic performance of the reinforcement scheme of the bridge ; the index of vibration sense based on the maximum velocity response and the index of vibration level based on the root mean square of acceleration both could evaluate the bridge comfortability well; it is not appropriate to take the impact factor as the only evaluation index of dynamic performance of the reinforcement scheme.
Keywords: curved truss bridge; vehicle-bridge coupled vibration; dynamic performance; evaluation of reinforcement scheme

Key words

curved truss bridge / vehicle-bridge coupled vibration / dynamic performance / evaluation of reinforcement scheme

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WANG Yan1,LIU Zhe1,ZHOU Ruijiao1,CHEN Huai1,ZHAO Zhiyou2. Evaluation of the reinforcement scheme for a long-span curved truss bridge based on vehicle-bridge coupled vibration analysis[J]. Journal of Vibration and Shock, 2022, 41(14): 199-209

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