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

Abstract

A new structural control system using damper-installed shear walls in lower stories with reduced stiffness is proposed for vibration control of high-rise RC buildings. That system has some design variables, i.e., height of shear wall, degree of stiffness reduction at lower stories, and quantity of dampers. In this paper, some parametric studies on the shearbeam model with a stiff beam against two kinds of ground motion, a pulse-type sinusoidal wave and a resonant sinusoidal wave, are conducted to clarify the vibration characteristics of the proposed structural control system. It is shown that the optimal combination of design parameters depends on the input ground motion. It is also shown that it is possible to prevent from increasing the response under the one-cycle sinusoidal input resonant to the lowest mode and reduce the steady-state response under the harmonic input with the resonant fundamental period by reducing the stiffness in the lower structure and increasing the damper deformation.

Hysteretic-Viscous Hybrid Damper System With Stopper Mechanism for Tall Buildings Under Earthquake Ground Motions of Extremely Large Amplitude

“…However, after the experience of catastrophic damages due to unpredictable natural hazards, the design principle was partially changed to the use of passive control devices for continuous use of buildings without disruption. The wide range of research on passive control can be found across versatile literature (for example, Aiken et al, 1993;Hanson, 1993;Nakashima et al, 1996;Soong and Dargush, 1997;Hanson and Soong, 2001;Takewaki, 2009;Lagaros et al, 2013;Fukumoto and Takewaki, 2017;Tani et al, 2017;Hayashi et al, 2018;Makita et al, 2018;Kondo and Takewaki, 2019;Kawai et al, 2020). Even in such circumstances, another kind of difficulty arose in the 2016 Kumamoto earthquake (Japan).…”

Smart Seismic Control System for High-Rise Buildings Using Large-Stroke Viscous Dampers Through Connection to Strong-Back Core Frame

“…Various passive structural control systems exist for tall buildings (Takewaki, 2009;Lagaros et al, 2012;Takewaki, 2015, 2017;Tani et al, 2017;Domenico et al, 2019). The most popular includes the interstory-type (Takewaki, 2009;Lagaros et al, 2012;Domenico et al, 2019) and soft first story-type (Tani et al, 2017). However, passive structural control systems, able to respond to both near-fault ground motions and long-duration/ long-period ground motions, are very limited (Murase et al, 2013;Takewaki, 2015, 2017;Hayashi et al, 2018).…”

Effects of Hysteresis and Negative Stiffness on Seismic Response Reduction: A Case Study Based on the 1999 Athens, Greece Earthquake

“…In addition, a large oscillating mass is generally required in order to achieve significant vibration reduction, rendering its construction and placement rather difficult in real-life situations. Similarly, many researchers have investigated the implementation of other passive systems on vibration control, e.g., Han et al (2006), Patel and Jangid (2011), Tani et al (2017), and Taniguchi et al (2016), including rocking controlled systems (Eatherton et al, 2010;Ma et al, 2010;Lu et al, 2017).…”