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
1.Engineering Institute of Engineering Crop, PLA Univ. of Sci&Tech., Nanjing 210072. Engineering Design and Research Institute of Second Artillery Corps, Beijing 100011, China
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.
2011, Vol. 30 
