中文摘要：

为了研究桥下净空对高架栈桥断面风场的影响，首先采用分离涡模拟方法对栈桥断面风场进行模拟，再结合小波功率谱分析，研究净空对栈桥断面的三分力系数影响程度，并与波浪影响程度相比较。分析结果表明：桥下净空变化对栈桥断面的阻力系数有显著影响，同时对升力系数和扭矩系数也有影响，但相对波浪影响程度而言很小，可忽略不计。

英文摘要：

Wind flow around the trestle bridge deck was simulated by the detached eddy simulation （DES） method to analyze the influence of the headroom on it. Integrated with wavelet power spectrum analysis method, the influence degree of the headroom to the law of the coefficient of the tri-component force was studied and compared with the affection of the wave. The results show that the drag coefficient changes remarkably as the headroom changes, and at the same time, the lift coefficient and the torque coefficient change indistinctively, while all these are neglectable compared with the influence of the wave.