Study on Hybrid Control Method of Mega-Sub Controlled Structure Subjected to Seismic Action

Abstract

A new structural configuration that named Mega-sub controlled structure (MSCS) is presented in the process of tall buildings, super tall buildings and super tall tower construction. To further improve the structural control effectiveness of MSCS, new hybrid control method which employs active control and adjusts the stiffness of substructure is proposed. At the same time, the control law and dynamic equation are presented that assembling parameter matrixes for the MSCS subjected to horizontal seismic excitation. Then, the influence of adjusting structure parameter and active control parameter on control effectiveness, dynamic characteristic and control force of the MSCS under hybrid control is discussed. Results indicate that, the new hybrid control method proposed in the paper has the ability to develop a high level of response control effectiveness when subjected to seismic action, and a much better control effectiveness will be obtained after parameters optimization.

Technical Note: Active and Semi-Active Strategies to Control Building Structures Under Large Earthquake Motion

“…On the one hand, the possibility of embedding devices within the load-bearing structure may be supported by the use of the so-called smart materials [Amezquita-Sanchez et al, 2012]; for example, by piezoelectric actuators installed at the bottom of columns for active seismic control of tall buildings [Fallah and Ebrahimnejad, 2013], by piezoelectric friction dampers [Pardo-Varela and De La Llera, 2015] in base isolation systems [Etedali et al, 2013], or as piezoelectric-based variable stiffness systems [Duerr et al, 2013]. On the other hand, some structural systems seems to be more suitable for integrating control devices because of either the geometric fit between load-bearing and force-control paths, such as tensegrities and active tendons, or the high level of response control effectiveness they achieve when subjected to seismic motion, such as mega-sub controlled structures [Xia, 2012] and controllable outriggers. This latter system has received particular attention lately, especially in terms of the application of MR dampers [Asai et al, 2013a;Chang et al, 2013;Wang et al, 2010], because only few dampers have to be installed between outrigger and perimeter columns for energy dissipation purposes.…”