Passive Control Systems for Seismic Damage Mitigation
Publication: Journal of Structural Engineering
Volume 124, Issue 5
Abstract
This paper proposes a simplified theory to predict and compare the seismic performance of viscoelastical (VE)- and elastoplastical (EP)-damped passive control systems, and to demonstrate their ability to protect structures during a major seismic event. Closed-form expressions for “equivalent period” and “equivalent damping” of these systems are proposed by idealizing them as linear single-degree-of-freedom (SDOF) systems. The expressions are used to clarify and compare the structural parameters, seismic drift, and force for the systems, based on a common high-damping linear spectrum. By extending the SDOF theory, a seismically deficient 14-story steel moment resisting frame (MRF) is upgraded by inserting VE or EP dampers. Extensive three-dimensional multi-degree-of-freedom nonlinear dynamic analyses are performed for the MRF, VE system, and EP system using earthquakes of various intensities. The 14-story VE and EP systems responded as predicted by the SDOF theory. They show much smaller drifts than the original MRF, keep frame members elastic, and protect nonstructural components, even against major earthquakes.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 5 • May 1998
Pages: 501 - 512
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 1998
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