Wind induced vibration control study of high-rise structures with TMD and AMD/HMD

Abstract

This thesis presents comprehensive researches on wind-induced vibration control technologies that are applied to high-rise structures, focusing on passive control system TMD (tuned mass damper) and active control system AMD (active mass damper) and HMD (hybrid mass damper). First, wind effect on high-rise structures is analyzed, and numerical schemes for simulating wind-induced dynamic responses of high-rise structures are introduced to build a basis for this study. Second, optimal parameters of TMD installed on structures are deduced, and a comprehensive FEM model of Taipei 101 tower, which carefully considers the interactions between the main structure and the damping system, is built to evaluate the efficiency of the passive control system. The simulation results demonstrate that after installing TMD, the peak responses of the wind-induced vibration of Taipei 101 tower reduced substantially, and the overall structural dynamic performance are considerably improved. Afterwards, the research area is extended to active control systems of AMD and HMD. The working principles of AMD and HMD are examined, and an innovate active control scheme which can mitigate both the translational and rotational vibrations of high-rise structures are proposed. Modern control theories that are employed to control civil structures are presented, and optimal control algorithms of LQR (linear quadratic regulator) and LQG (Linear quadratic Gaussian) are specially studied. As for active control scheme of large scale structures, the degree of freedom of the computational models are too large to be handled with current computational capability, thus matrix condensing methods are utilized to reduce the computational time to a workable degree. The research demonstrates that by incorporating actuator and feedback subsystems into AMD and HMD, and choosing suitable control algorithms, these active control systems show superior performance than their passive counterparts in reducing wind-induced vibrations of high-rise structures. Although the masses of these active control systems are just a small fraction of TMD, these active control systems are able to adapt to structural changes and to varying usage patterns and loading conditions. Finally, SPFIC (Shenzhen Pingan International Financial Center) is used as an example to verify the effectiveness of the proposed control schemes.

Date of Award	14 Feb 2014
Original language	English
Awarding Institution	City University of Hong Kong
Supervisor	Qiusheng LI (Supervisor)