Control of Civil Structures Using a Semiactive Stiffness System Based on Variable Amplification
Publication: Journal of Structural Engineering
Volume 134, Issue 7
Abstract
Various semiactive systems have been proposed to control the seismic response of civil structures. These include semiactive fluid, friction, and stiffness devices. Energy dissipation in these devices occurs through a variety of mechanisms. The purpose of the present study is to propose a new semiactive stiffness system that dissipates energy based on the principle of hysteresis. The system consists of a novel variable amplification device (VAD) connected to a simple spring. When integrated with other semiactive components, the stiffness of the VAD-spring system can be adjusted based on feedback from the structure’s response. This is done by changing the amplification factor of the VAD according to a semiactive control algorithm tailored specifically to the device’s unique characteristics. The proposed system is simulated for an eight-story building subject to multiple seismic excitations. The response of the building using the VAD-spring system is compared with the maximum amplification case and that obtained using the active variable stiffness system. Results indicate that the VAD-spring system is an effective means of controlling vibrations in seismically excited buildings.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 7 • July 2008
Pages: 1246 - 1251
Copyright
© 2008 ASCE.
History
Received: Jun 20, 2005
Accepted: Nov 7, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
Notes
Note. Associate Editor: Anil Kumar Agrawal
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