台风作用下高耸结构动力响应及风振控制分析

高耸结构柔性较大，对风荷载较为敏感，相比一般风的影响，台风作用下的结构更易产生强烈的动力响应。考虑台风的基本特性，选取合适的台风风速谱，运用数值模拟方法，仿真得到了与结构竖向相关的18条脉动风载时程样本。利用有限元软件ANSYS建立某高耸钢塔结构三维空间有限元模型，并在时域内对设置粘滞阻尼器的结构进行控制效果分析，得到最优粘滞阻尼系数。研究表明：编制的MATLAB程序可较好的模拟高耸结构的台风脉动风载时程，风速时程的功率谱与目标值吻合得较好；设置粘滞阻尼器后结构的位移和加速度响应均有明显的减小，粘滞阻尼器是一种性能很好的阻尼器。

Analysis of Dynamic Response and Wind-Induced Vibration Control of High-Rising Structure under Typhoon

high-rising structures are very sensitive to wind load due to the higher flexibility. They can generate strong dynamic responses to the excitation of typhoon. Considering the basic characteristics of typhoon and selecting appropriate wind speed spectrum of typhoon, 18 samples of fluctuating wind loads are obtained by numerical simulation. A three-dimensional finite element model of a high steel tower is established with ANSYS10.0. The control effect of the structure with viscous damper is analyzed in the time domain. The optimal viscous damping coefficient is obtained. The results show that the MAT-LAB program can simulate the wind load history of typhoon very well, and the power spectrum of the wind velocity history of the high-rising structure checks well with the objective power spectrum. The wind-induced responses of displacement and accelerate of the structure are decreased greatly with the viscous damper.