摘要
针对机动式高架栈桥的特点，采用分离涡方法模拟湍流，基于任意拉格朗日-欧拉方法（ALE Arbitrary Lagrangian Eulerian）求解流固耦合，对栈桥系统的风浪耦合位移响应过程进行了三维数值模拟分析。结果表明：风浪耦合作用下高架栈桥的运动以平动为主，传统的简单叠加算法会产生较大误差；波浪频率若接近高架栈桥的固有频率，可引起强烈的共振效应，此时结构在风浪耦合作用下的位移响应远大于仅受波浪荷载时的响应；若波浪频率与高架栈桥固有频率相差较大，则结构在风浪耦合作用下的线位移响应小于两种荷载单独作用下的线位移响应之和，但对角位移影响不大。
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.
关键词
分离涡模拟 /
ALE /
流固耦合 /
高架栈桥 /
风浪耦合
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Key words
detached eddy simulation /
ALE /
FSI(fluid structure interaction) /
trestle bridge /
coupling of wind and wave
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李霞;孙芦忠;尹洪波;谢兴坤.
机动式高架栈桥在风浪耦合作用下的位移响应[J]. 振动与冲击, 2011, 30(11): 117-121
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
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