随机风场下高层结构振动隔震与TMD混合控制研究

针对风荷载作用下高层建筑结构振动控制问题,基于建筑隔震和调谐质量阻尼器振动控制原理,利用ANSYS软件分别建立高层结构带隔震层和带调谐质量阻尼器(TMD)的单一控制策略以及两者相结合的混合振动控制策略。根据Davenport脉动风速谱,采用自回归模型(AutoRegressive,AR)法,考虑竖向相关性、平稳的多变量随机过程以及它的互谱密度矩阵模拟生成具有随机性的脉动风速时程曲线和风速谱的功率谱密度,并用于20层钢结构Benchmark结构模型。系统比较三种振动控制策略在顺风向脉动风载作用下的控制效果,结果表明隔震与TMD混合振动控制方法可以有效地抑制结构风振响应,控制效果很好地弥补了单一振动控制的缺陷。本文方法可应用于大尺度高层结构振动控制中,实现高层建筑结构风振响应的可靠控制。

Analysis of wind vibration reduction by vibration isolation and TMD mixed vibration control under stochastic wind field

A method for vibration control of high-rise buildings under wind load is explored in this paper. By combining the isolation control and the tuned mass damper(TMD)control strategy, the Benchmark structure model of 20-storey steel structure, with isolation layer, TMD damper and a hybrid vibration control method respectively, is established by using the ANSYS software. By employing the auto-regressive method, the stochastic fluctuating wind field and cross-spectral density function have been simulated by using the Davenport wind speed power spectrums and taking spatial correlation, stationary multivariate stochastic process into consideration. The control effects of three vibration control methods under the downwind wind load are compared. The results show that the hybrid vibration control method of isolation and TMD can effectively suppress the wind-induced vibration response of the structure while the control makes up for the defects of the single vibration control very well. This method can be applied to the vibration control of large scale high-rise buildings to realize the reliable control of wind vibration response of high-rise buildings.