双非平稳地震激励下巨子型有控结构振动控制研究

Vibration Control Analysis of MSCSS (Mega-Sub Controlled Structure System) Subjected to Non-Stationary Seismic Excitation

利用特定震级、震源距下的强度-频率双非平稳地震加速度激励谱,结合虚拟激励法对巨子型有控结构(MSCSS)进行随机振动分析,并与工程中常用的强度调制非平稳地震激励下的工况进行比较,结果表明双非平稳激励研究更接近实际地震情况,此时结构的位移、加速度响应要更大,结构更易破坏。同时研究也证明了MSCSS较传统的巨型框架结构有更好的减震控制能力。讨论了MSCSS的结构构造参数,如巨子结构质量比、巨子结构相对刚度比、调频子结构的楼层数对整体结构减震效果的影响,在MSCSS进一步的设计研究中,可以根据计算结果合理分配这些参数,以使结构的控制效果达到最佳。

The pseudo excitation method is adopted to perform a random vibration analysis for MSCSS （Mega-Sub Controlled Structure System） under non-stationary seismic excitation for given earthquake magnitude and distance. When compared with amplitude non-stationary seismic excitation situation, it is shown that the non-stationary characteristics both in amplitude and frequency will increase the response of displacement and acceleration, which can lead to the structure destruction easily, and it is also numerically shown that MSCSS is better than traditional megaframe in our vibration control. Furthermore, the relationships among dynamical parameters and MSCSS were investigated and simulation results show that the parameters （ the number of sub-structure floors, mass ratio and stiffness ratio respectively between mega-structure and sub-structure） can be optimized to improve the vibration control capability.