基于风振舒适度的北京奥林匹克塔黏滞阻尼减振性能研究

Vibration control properties of the Beijing Olympic Tower using viscous dampers considering human comfort under wind loads

以北京奥林匹克塔为工程背景,对其展开以舒适度为控制指标的黏滞阻尼减振性能研究。根据该多塔高耸结构的特点设计了连接桁架加腋的结构方案和不加腋的结构方案,比较分析两者之间动力特性的变化。并在连接桁架不加腋结构方案的基础上引入黏滞流体阻尼器(viscous fluid damper, VFD),对阻尼器的安装位置、装置数量等进行优化设计,形成了结构黏滞阻尼减振方案。利用风洞试验结果生成的三维风场,开展了连接桁架加腋方案、连接桁架不加腋方案和黏滞阻尼减振方案的风振响应分析,并从响应的空间分布、受风向角影响规律、时频域特性和阻尼器输出特性等方面进行分析。结果表明:相对于连接桁架不加腋方案,无论是连接桁架加腋方案还是黏滞阻尼减振方案,结构的加速度峰值响应均有不同程度的减小,其中黏滞阻尼减振方案最大衰减可达30.28%。

Taking Beijing Olympic Tower as the engineering background, the vibration control properties using viscous dampers, which are aimed to improve the human comfort, were investigated. Both haunched corridors scheme and unhaunched corridors scheme were designed according to the structural characteristics of the multi-tower structure, and their dynamic characteristics were compared. Then the viscous fluid dampers(VFDs) were introduced into the unhaunched corridors scheme, and the position, amount and other parameters of these dampers were optimally designed to develop a structural control scheme. A three-dimensional wind field of the structure was generated from wind tunnel data, and the wind-induced responses of the aforementioned three schemes were analyzed. The results were analyzed in terms of space distribution of responses, influences by wind angles, time and frequency characteristics and damper outputs. The results show that the peak acceleration responses of both the haunched corridors scheme and the structural control scheme are reduced compared with the unhaunched corridors scheme, and the maximum reduction of the structural control scheme reaches 30.28%.