Displacement response of flexible overhead trestle bridge subjected to coupling of wind and wave

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (11) : 117-121.

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Displacement response of flexible overhead trestle bridge subjected to coupling of wind and wave

Li Xia1; Sun Lu-zhong1; Yin Hong-bo3; Xie Xing-kun1

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Abstract

In order to investigate the property of flexible overhead trestle bridge, the detached eddy simulation method is employed to simulate turbulence, and ALE (Arbitrary Lagrangian Eulerian) method is adopted to solve fluid structure interaction. The 3D displacement responding process of trestle bridge system subjected to wind and wave is simulated. Results show that the angular movement of trestle bridge is very small and can be ignored. The traditional simple superposition method, which used to compute displacement response of trestle bridge, may lead to big error. If wave frequency is close to trestle bridge’s natural frequency, strong sympathetic vibration will be induced and the displacement response of trestle bridge subjected to coupling of the two loads is much bigger than only to wave load. In contrast, if wave frequency is quite different from trestle bridge’s natural frequency, then the linear displacement response subjected to the couple of the two loads is smaller than summation of response to the two single loads, but the amplitude of angular displacement response is almost the same considering coupling of air and wave or not.

Key words

detached eddy simulation / ALE / FSI(fluid structure interaction) / trestle bridge / coupling of wind and wave

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Li Xia;Sun Lu-zhong;Yin Hong-bo;Xie Xing-kun. Displacement response of flexible overhead trestle bridge subjected to coupling of wind and wave[J]. Journal of Vibration and Shock, 2011, 30(11): 117-121