Optimum design for more effective tuned mass damper system and its application to base-isolated buildings

Abstract

Base-isolated structures are vulnerable to long-period ground motions due to resonances. The hybrid control strategy combining traditional tuned mass dampers (TMDs) with base-isolation systems has been proved by some researchers to be effective in preventing the resonant behaviors. However, large space for TMDs is required because of large stroke lengths of TMDs, which may be difficult to realize in practical applications. In this paper, a non-traditional TMD that is directly connected to the ground by a dashpot is adopted to mitigate the resonant behavior of a structure. It is found that the conventional design method of traditional TMDs based on the quasifixed points theory cannot provide the global minimum value of the objective function for non-traditional TMD systems. An optimum design method for obtaining a wide suppression bandwidth is proposed. Seismic-induced vibration control for a three degree-of-freedom base-isolated structural system with a non-traditional TMD is studied. The control effect of the optimally designed non-traditional TMD is significantly improved, and the stroke length of the non-traditional TMD is greatly reduced, compared with the traditional TMD during near-field long-period earthquakes. In these regards, non-traditional TMDs may provide a better solution for retrofitting or constructing base-isolated structures. = 0.119): (a) absolute acceleration of primary structure; (b) stroke length of tuned mass damper (TMD). OPTIMUM DESIGN FOR MORE EFFECTIVE TMD

Earthquake Protection of Existing Structures with Limited Seismic Joint: Base Isolation with Supplemental Damping versus Rotational Inertia

“…In the context of hybrid control strategies, applications of BIS in conjunction with a TMD attached immediately above or below the isolation oor of the building have been extensively discussed in the literature [17][18][19][20]. It has been found that by attaching a TMD to the BIS, a certain reduction of the displacement demand of a base-isolated structure is achieved, depending on the TMD mass.…”

“…e optimization procedure here proposed resembles tuning procedures for TMD-based control strategies [10,20,27,44], wherein some parameters are the free design variables sought in the optimization problem, while other parameters are supposed known. e TMDI is characterized by four parameters in the most general case, namely, μ t , β t , ω t , and ζ t .…”

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.…”

“…Recently, large mass ratio TMDs were tackled for base-isolated buildings (Villaverde, 2000;Villaverde et al, 2005;Angelis et al, 2012;Nishii et al, 2013;Xiang and Nishitani, 2014). While usual tall buildings exhibit large displacement near the top story because of contribution of almost uniform inter-story drifts, base-isolated buildings show relatively large displacement at the base-isolation story near ground surface.…”

“…While usual tall buildings exhibit large displacement near the top story because of contribution of almost uniform inter-story drifts, base-isolated buildings show relatively large displacement at the base-isolation story near ground surface. This property is very useful from the view point of reduction of effect of large vertical loads due to large mass ratio TMD (Kareem, 1997;Zhang and Iwan, 2002;Mukai et al, 2005;Petti et al, 2010;Nishii et al, 2013;Xiang and Nishitani, 2014). However, several issues still exist, e.g., avoidance of excessive vertical load by large mass ratio TMD, reduction of TMD stroke, and reduction of TMD support reactions (Hashimoto et al, 2015).…”