Energy Balance Assessment of Base-Isolated Structures
Publication: Journal of Engineering Mechanics
Volume 130, Issue 3
Abstract
This paper explores the use of energy concepts in the analysis of base-isolated structures subject to severe earthquake ground motions. We formulate the energy balance equations in moving- and fixed-base coordinate frames and provide new physical insight into the time-dependent behavior of individual terms. Conventional wisdom in earthquake engineering circles is that systems with base isolation devices should be economically competitive and designed to: (1) minimize input energy, and (2) maximize the percentage of input energy dissipated by damping and inelastic mechanisms. Through the nonlinear time-history analysis of a base-isolated mass-spring system subject to an ensemble of severe ground motion inputs, we demonstrate that improvements in objective (2) often need to be balanced against increases in input energy. Hence, by itself, objective (1) presents an overly simplified view of desirable behavior.
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Information
Published In
Journal of Engineering Mechanics
Volume 130 • Issue 3 • March 2004
Pages: 347 - 358
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jul 13, 2000
Accepted: Mar 12, 2003
Published online: Feb 19, 2004
Published in print: Mar 2004
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