Vibration Control of Tall Buildings Using Mega SubConfiguration

Abstract

An innovative vibration-control system is proposed to reduce the dynamic response of tall buildings to wind and seismic loads. This system takes advantage of the so-called megasubstructure configuration, which is especially popular in tall buildings. Substructures contained in the megastructure serve as energy absorbers so that no additional mass is required for the intended vibration control as seen in the conventional mass damper systems. The proposed system naturally resolves the difficulties in augmenting damping capacities of tall buildings associated with the high rigidity and deformation in the dominant bending mode. Dynamic characteristics of the proposed control system including the frequency response and the energy flow are investigated. Optimal values of structural parameters such as the damping ratio and stiffness of the substructure are determined. The feasibility and effectiveness of this unique control system in improving human comfort and protecting structures under both wind and earthquake loads are demonstrated through analytical and numerical analysis.

Semi‐active tuned mass damper building systems: Application

“…In an attempt to increase the performance of the TMD without incurring the problems noted above, active and semi-active TMD (ATMD and SATMD) systems have been proposed [4][5][6][7]. To overcome the limitation of the TMD mass, various seismic isolation concepts using TMD related principles have been extended to convert a structural system into a TMD system by specially designing the structural system [8][9][10][11][12][13][14][15][16].…”

Study on the Application of Large Tuned Mass Ratio in Damping System

“…However, the current "Building Seismic Design Code", has not yet included in the TMD design provisions, indicating that tuned mass damping technology in the field of building seismic design is not yet mature. A large number of research data shows that the seismic frequency components are more complex than the wind load, the existing TMD vibration frequency bandwidth cannot fully meet the needs of building damping, this is one of the reasons why TMD is difficult to apply to building damping [1] . In a typical TMD study, considering the general building design of the ground carrying capacity and economic issues, the tuned mass ratio should be controlled within 5%.With the giant structure of the controlled structure [2] , the giant frame suspension structure system [3] , the giant frame multifunction damping structure system [4] , the tuning frequency ratio can be greatly improved in value, or even more than 100 %.…”

Innovative Seismic Response-Controlled System with Shear Wall and Concentrated Dampers in Lower Stories

“…Nevertheless, large mass ratio TMDs have been explored mainly for earthquake inputs (Chowdhury et al, 1987;Feng and Mita, 1995;Arfiadi, 2000;Villaverde, 2000;Zhang and Iwan, 2002;Mukai et al, 2005;Villaverde et al, 2005;Tiang et al, 2008;Matta and De Stefano, 2009;Petti et al, 2010;Angelis et al, 2012;Nishii et al, 2013;Xiang and Nishitani, 2014). It should be pointed out that several projects are being planned in Japan aiming at installation of large mass pendulum systems at roof and usage of upper stories as TMD masses.…”