巨-子型控制结构体系风振的半主动控制研究

研究了利用磁流变阻尼器对巨-子型控制结构体系风振反应进行半主动控制的分析方法,建立了随机脉动风荷载下结构体系的振动控制方程,利用随机振动理论对脉动风荷载进行了计算机模拟,并采用基于经典最优控制理论的限界Hrovat最优半主动控制算法对结构体系风振反应的控制进行了研究.算例分析表明:采用磁流变阻尼器对巨～子型控制结构体系进行半主动控制后,主结构顶层的位移和加速度控制的减振率VAR分别为29.65%和68.09%,第2个子结构和第3个子结构顶层加速度控制的减振率VAR分别为40.18%和70.05%,有效地减小了结构体系的风振反应.

Semi - active Control for Wind - induced Vibration of Mega - sub Controlled Structural System

In this paper,an analysis method of semi-active control using magnetorheological(MR) damper for the new structural configuration,that is,the mega-sub controlled structural system presented recently,is investigated under random wind excitations.The dynamic equations of this new structural system are derived based on complex modal analysis theory,and the practical fluctuating winds are simulated,then,the semi-active control law based on the classical LQR theory is further developed to investigate the controlling effectiveness of this new structural system.The numerical analysis indicates that the MR damper by using semi-active control algorithm can reduce or control the structural response evidently,the corresponding reducing amounts of the deformation response and the acceleration response at the top mega floor being 29.65%and 68.09% respectively,and the reducing amounts of the acceleration responses at the top floor of the second and the third substructure being 40.18% and 70.05% respectively.