Performance of hybrid mass damper system applied to a 36‐storey high‐rise building

Abstract

SUMMARYA recently developed hybrid mass damper (HMD) system and its application to a 36-storey high-rise building with a bi-axial eccentricity, located in Tokyo, are presented. This new HMD system utilizes a gear-type pendulum and a linear actuator. Here, the gear-type pendulum is employed to make the natural period of the auxiliary mass comparatively long while minimizing the height of the device, and the linear actuator, on the other hand, ensures smooth and noiseless operation of the system. There are several special features in the control method as well; two HMD systems are applied to control the transverse-torsional coupled vibration of the building, and also variable gain feedback (VGF) control technique has been developed to fully utilize the capacity of the HMD system from weaker to stronger external excitations.Free vibration tests as well as control of wind vibrations of the building induced by the Typhoon 9810 in 1998 were used to verify the performance of the control system. It was found that the maximum and the root-mean-square acceleration responses of the building were reduced to 63 per cent and 47 per cent of the corresponding uncontrolled accelerations. Finally, the control performance of the system was conÿrmed.

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

“…Implementations of semi-active variable damping systems on buildings, based on the information available in the reports from [Ikeda, 2009;Kurata and Kobori, 2003;Kurino et al, 2010;Shimizu et al, 2004;Takahashi et al, 1998] 3, 5, 7-9, 12-13, 21-24, 32, 34, 43, and 51-53, were based on the information available at [Fujinami et al, 2001;Fujita, 1994;Kitamura et al, 1992;Lin Zhou et al, 2012;Lu and Jiang, 2011;Maebayashi et al, 1992;Miyashita et al, 1998;Nagashima et al, 2001;Nakamura et al, 2001;Nishimura et al, 1998;Park et al, 2006;Saito et al, 2001;Shiba et al, 1998;Shimizu et al, 2004;Watakabe et al, 2001;…”

A Review on Adaptive Methods for Structural Control

“…Within this framework, Nagashima and Shinozaki [101,102] proposed to chose the gain among a set of feedback gains depending on an auxiliary variable that indicates a compromise between reducing the building response and reducing the stroke of the auxiliary mass. The set of gains are preliminarily computed by LQR as a function of the auxiliary parameter, allowing to keep the mass stroke below its limit.…”

LQR control with frequency‐dependent scheduled gain for a semi‐active floor isolation system

“…The widely used LQR control algorithm (e.g., [15][16][17][18][19][20]) was adopted to calculate the desired control force u * . The state variable X shown in Eq.…”

“…In this study, semi-active control is investigated for use in floor isolation systems. The effectiveness of semi-active control relies significantly on the control algorithm design [15][16][17][18][19][20][21][22][23][24][25][26][27]. In designing a semi-active floor isolation system that is effective in reducing acceleration for both short-and long-period motions while still limiting displacements, it is necessary to consider the frequency characteristics of different excitations.…”

“…A method using linear quadratic regulator (LQR) control with frequency-dependent scheduled gain (LQRSG) is proposed. LQR control has been widely used in structural control [15][16][17][18][19][20]. The control gains used in LQR control are determined without considering the input motion characteristics.…”