Base‐isolated structures with selective controlled semi‐active friction dampers

Abstract

This paper investigates effectiveness of selective control strategy in hybrid base isolation systems including isolators and semi‐active variable friction (VF) dampers. According the selective control strategy, VF dampers are activated just if the displacement at the isolators exceeds the threshold value. The slip‐force control is based on the values of floors' accelerations and velocities. By controlling the slip‐force magnitude in the VF dampers, effective energy dissipation can be achieved in a seismic event. Activation of dampers according to the selective control strategy allows high‐energy dissipation by minimum energy required for adjusting the slip‐force. Performance of a multi‐storey frame with a base isolation system and VF dampers under various earthquake records was obtained numerically using originally developed MATLAB routines. Seismic response of the analysed structure with the selective controlled system was compared with that when the VF dampers were active during the whole earthquake. It is shown that adjustment of the slip‐force in a selective manner allows additional reductions in peak displacements and accelerations of the structure. The results also demonstrate that this control strategy yields reduction of the base displacement without increasing the peak base shear forces. Copyright © 2009 John Wiley & Sons, Ltd.

Self-Tuning Fuzzy Control for Seismic Protection of Smart Base-Isolated Buildings Subjected to Pulse-Type Near-Fault Earthquakes

“…As a novel semi-active control device, piezoelectric friction dampers have been widely investigated by many researchers [24,25]. Recently, the authors also proposed a piezoelectric friction damper and investigated in their performances theoretically and experimentally [26].…”

Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings

“…There are different methods for the design of tall buildings subjected to extreme loadings (e.g. earthquake attack), which includes base-isolation methods (Khoshnoudian and Azad, 2011;Mehrparvar and Khoshnoudian, 2011;Yamamoto et al, 2011); installation of semi-active dampers (Ribakov, 2011a(Ribakov, , 2011b, active dampers (Ribakov and Agranovich, 2011a), passive dampers (Chung et al, 2009;Lee et al, 2009;Ribakov and Agranovich, 2011b) and tuned mass dampers (Heo et al, 2009;Marano and Greco, 2009;Mohebbi and Joghataie, 2012) and by reinforcement details such that a plastic hinge region can be formed to dissipate energy through inelastic deformation without structural collapse (Pam and Ho, 2009;Yan and Au, 2010). Amongst these measures, the last method is generally applicable to medium-rise and tall buildings for performance-based design approach (Sabol and Nishi, 2011), while the former methods are only cost-effectively for very tall buildings.…”

Limited ductility design of reinforced concrete columns for tall buildings in low to moderate seismicity regions

“…For structures located in seismic risk regions, the design of HSRC structures should consider appropriate methods of dissipating the enormous energy induced by earthquake attack. This can be generally achieved by installing dampers (Chung et al ., 2009; Heo et al ., 2009; Lee et al ., 2009; Marano and Greco, 2009), adopting base isolation design (Ribakov, 2009; Takewaki and Fujita, 2009; Yamamoto et al ., 2009) or by careful detailing of reinforcement such that plastic hinges could be formed at designated location(s) to dissipate excessive energy through inelastic structural damage but not collapse (Park, 2001). Comparing with the installation of dampers and adopting base isolation method, the method of reinforcement detailing is less costly and is applicable to all types of structures.…”