风激下结构的紊流诱发振动

高耸结构群或桥梁部件在风激下，除了产生经典气动弹性效应外，还会引起结构或部件间的相互动力干涉作用，特别是由于上游结构振荡绕流所形成的紊流激励作用，使得处于尾流场中的结构或部件的动态性能与上游结构有明显的差别。文中报导弹性约束下两Ｈ型结构的气动干涉实验结果。依据实验观察到的主要特征分析风激干涉下结构的紊流诱发振动与随机动力稳定性，得出紊流随机响应的解析表达式以及用以确定临界风速的动力稳定性条件，计算

The Turbulent Flow-Induced Vibration of Structure under the Wind Excitation

Storm or hurricane is a tremendous natural disaster for the flexible long-span bridges and theirmembers, wind-sensitive high-rise buildings etc. , many tragic events have occured in the history ofwind engineering. The collapse of three cooling towers at Ferrybridge in the UK in 1965 shows thatthe structures in the wake flow field are most danserous due to aerodynamic interference effects. Thepaper reports the turbulent features of flow field in the tunnel tests for aerodynamic interference. Ac-cording to the vibrational state of structures, the turbulent flow-induced motion equation of system un-der the action of wind is established, moreover, the random dynamic response and stochastic dynamicstability of structure in the turbulent flow field are obtained, and finally, the critical wind velocity isgiven. The control sets can prevent and decrease the vibration of system.