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针对巨-子结构体系,提出在巨-子结构间设置柔性隔震层,并增设一种SMA-压电复合智能阻尼器,形成巨-子结构智能控制体系,可有效改善巨-子结构的抗震安全性。介绍了SMA-压电阻尼器的工作原理与力学模型,建立了巨-子结构体系智能控制体系的分析模型,在此基础上构建了巨-子结构智能控制体系的运动方程。基于限界Hrovat最优控制算法和H2/LQG算法设计了巨-子结构智能控制体系的半主动控制器,进行了Simulink控制效果仿真分析,并与传统抗震,被动隔震,SMA-压电阻尼器的Passive-on、Passive-off控制和理论最优的主动隔震控制策略进行了系统的对比研究。仿真分析结果表明,SMA-压电阻尼器实施智能隔震控制时可兼顾主结构与子结构的控制效果,其控制效果与主动控制时接近,远优于被动控制策略。所提出的巨-子结构智能控制体系可望应用于实际工程中,并取得较好的经济和社会效益。
Aiming at the giant-substructure system, a flexible isolation layer between giant and substructures is proposed and an SMA-piezoelectric composite intelligent damper is added to form a giant-substructure intelligent control system which can effectively improve the structure of giant-substructure Seismic safety. The working principle and mechanical model of SMA-Piezoelectric Damper are introduced, and the analytical model of giant-substructure intelligent control system is established. Based on this, the equations of motion of giant-substructure intelligent control system are constructed. The semi-active controller of giant-substructure intelligent control system is designed based on the limit Hrovat optimal control algorithm and the H2 / LQG algorithm. Simulink control effect simulation is carried out and compared with the traditional seismic, passive isolation, SMA-piezoelectric damper Passive-on, Passive-off control theory and the optimal active isolation control strategy for a systematic comparative study. The simulation results show that the SMA-Piezoelectric Damper can take into account the control effect of the main structure and the substructure when implementing the intelligent isolation control. The control effect is close to that of the active control, much better than the passive control strategy. The proposed giant - substructure intelligent control system is expected to be applied in practical engineering and achieve better economic and social benefits.