桥下净空对高架栈桥风载影响的分离涡模拟  

Detached eddy simulation of wind flow around trestle bridge deck

作　　者：谢兴坤[1] 尹洪波 孙芦忠[1] 于伟[1] 

机构地区：[1]解放军理工大学工程兵工程学院 [2]解放军第96657部队

出　　处：《解放军理工大学学报（自然科学版）》2011年第3期273-278,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10772197)

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。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.

关 键 词：分离涡模拟 高架栈桥 小波功率谱 三分力系数 

分 类 号：U441[建筑科学—桥梁与隧道工程]