Human-induced vibration control of curved beam footbridge with single inclined cable arch

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 83-92.

LUO Xiaoqun, ZHANG Jin, SHEN Zhao, ZHANG Qilin, LIU Shenru

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Abstract

Human-induced vibration control of a curved beam footbridge with single inclined cable arch was studied. Based on the shape finding and static/dynamic analysis of the footbridge, the vibration response of the footbridge under stochastic crowd load was simulated. The effect on controlling vibration through tuned mass dampers (TMDs) was studied parametrically, considering effects of mass ratio, stiffness, damping parameters and layout modes. The dynamic field measurement of the footbridge was carried out with and without TMDs. The modal characteristics and vibration response under single-pedestrian, multi-pedestrian and crowd loads were tested. The performance upgrading for vibration control with TMDs on the footbridge was evaluated. The results show that the key modal damping of the structure with TMDs was 4.59 times as much as that without TMDs; the peak acceleration of the structure decreased 31.1%~55.9% and the acceleration root mean square (RMS) value decreased 36.4%~52.0% under single person walking and running conditions; the vertical acceleration peak of the structure reduced to 0.41m/s2 under various crowd load conditions. The research results show that this kind of curved beam footbridge supported with single inclined cable arch is flexible and human-induced vibration is hard to control by increasing the structure stiffness. By setting TMDs gives a good performance on human induced vibration control on such flexible footbridge.

Key words

footbridge / stochastic crowd load / tuned mass damper / field measurement

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LUO Xiaoqun, ZHANG Jin, SHEN Zhao, ZHANG Qilin, LIU Shenru. Human-induced vibration control of curved beam footbridge with single inclined cable arch[J]. Journal of Vibration and Shock, 2020, 39(11): 83-92

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