轨道型非线性能量阱对高层结构脉动风振的控制仿真

Simulation of track nonlinear energy sink for wind-induced vibration control in high-rise building

介绍了轨道型被动NES(Nonlinear Energy Sink),并对附加NES装置的5层钢框架进行了白噪声激励下的振动台实验,结果表明了NES能在多个频率范围内抑制结构振动。基于NES的这种优点,将其应用到高层结构的风振控制上。采用线性回归方法的AR模型,模拟了不同高度处的脉动风速时程作为建筑结构的外部激励。以脉动风激励下高层建筑顶层的加速度为控制目标,对NES的质量、轨道表达式和黏滞阻尼参数进行了一系列优化,选择较优的参数对NES控制下某结构的脉动风致振动进行了仿真计算。计算结果表明:NES可以有效减小脉动风作用下建筑结构的最大加速度与加速度均方根,并且其可以同时减小结构多个模态的振动,从而提高风载荷下高层建筑的舒适度。

Track nonlinear energy sink （NES）, a type of passive structural control device effective in a wide range of frequency, is introduced in the paper. Shaking table experimental investigation of a five-story frame structure coupled with a track NES are conducted by inputting white-noises. The results show that the track NES is capable of reducing the structural responses in multiple modes. NES can be applied to wind-induced vibration control of high-rise buildings due to this advantage. The AR lin- ear regression method is applied to generate the wind velocity time histories at different heights. Under the wind excitations, parameters of a track NES including the mass, track express and damping, are optimized to reduce the acceleration responses of a high-rise building to which the track NES is attached. The simulated results show that with proper parameters, the track NES is able to attenuate the wind-induced vibration efficiently.