巨—子型框架减振结构体系风振主动、混合控制仿真分析

【作者】 王富生；

【导师】 张洵安；

【作者基本信息】 西北工业大学 ， 结构工程， 2005， 硕士

【摘要】 巨—子型框架减振结构是Maria Q. Feng和Akira Mita结合结构控制理论和一般巨型框架结构的特点提出的一种新型的超高层建筑形式,它巧妙的将TMD和MTMD的质量调频原理应用于结构中,形成了一种具有自减振功能的结构体系。 论文在前人研究的基础上,从结构的安全性和舒适度要求出发,研究了巨—子型框架减振结构的主动控制和混合控制,并结合算例对其在风荷载作用下的动力响应进行仿真分析,以证明其有效性。 采用集中质量模型,主结构以弯曲变形为主,子结构以减切变形为主,建立了巨—子型框架减振结构的风振分析模型,给出了动力方程的具体形式;按照谐波叠加法中的M. Shinozuka方法对主结构顺风向脉动风荷载进行模拟,涉及到脉动风压规格化功率谱的推导以及脉动风荷载功率谱的计算;建立了巨—子型框架减振结构的风振主动控制分析模型,并基于线性二次型(LQR)经典最优控制算法推导了最优控制力;提出主动控制和调节结构参数相结合的新的混合控制系统,并用最优控制算法分析该系统,具体有两种方法:主动控制和调节子结构与主结构的刚度比相结合以及主动控制和调节子结构与主结构的质量比相结合;采用wilson-θ法对主动控制和混合控制进行时程分析。 以某一工程为仿真算例,从能量的角度给定权矩阵的具体形式,讨论了权待定参数(主动控制)以及调节参数和权待定参数(混合控制)对主结构顶层位移响应和最上部子结构顶层加速度响应的控制效果以及最大控制力的影响,并据此选定最优参数,分别考察了其对结构其它质点的影响。论文涉及不同主动控制系统的比较、主动控制和混合控制的比较以及两种混合控制方法的比较等。更多还原

【Abstract】 Mega-sub frame controlled structural system proposed by Maria Q.Feng and Akira Mita who combined structure control theory with the characteristic of conventional mega-sub frame structure is a new structural configuration of super tall buildings. It ingeniously applies the principle of tuned mass damper and multiple tuned mass damper to the structure, thus appears as a structural system having self-control function.Based on the former’s study, this paper takes work on the active and hybrid control of mega-sub frame controlled structure aimed at improving the safety and human comfort. In order to testify the validity, this paper also carries out the emulation analysis of dynamic response about a computation example under wind load.Cantilever bending stiffness is adopted in the mega structure, and shearing stiffness in the sub structure. Using the lumped mass model, this paper establishes the wind-vibration analytical model of mega-sub frame controlled structure and expresses its concrete form of dynamic equation. The pulsating wind load of mega structure in along-wind direction is simulated according to M.Shinozuka method related to deduction of pulsating wind pressure specification spectrum and calculation of pulsating wind load spectrum. The analytical model of active control is established and the optimal control force is deduced based on the classical LQR optimal control theory. This paper also puts forward a new hybrid control system which combines the active control with adjusting the structural parameter and analyses the system with the optimal control theory. There are two methods: the combination of active control with adjusting the relative stiffness ratio and combination of active control with adjusting the relative mass ratio between the mega and sub structure. wilson -θ method is applied to time history analysis of active and hybrid control.Choosing an engineering as emulation example and fixing the form of weighting matrix in terms of energy, this paper discusses the weighting parameter to be confirmed and adjusting parameter how to influence the control effect of the displacement response at the top megamass and the acceleration response at the top submass, at the same time how to influence the maximal control force. Then the optimal parameters are decided on and used to explore how to influence else part of structure. This paper involves in comparison between different active control systems, between active and hybrid control, and between two hybrid control methods etc.更多还原