Nonstationary Random Critical Excitation for Acceleration Response
Publication: Journal of Engineering Mechanics
Volume 127, Issue 6
Abstract
The critical excitation method is promising as a robust method for accounting for inherent uncertainties in predicting forthcoming earthquake events and for constructing design earthquake ground motions in a reasonable way. Most of the proposed theories are based on deterministic approaches and deal with displacement responses. A stochastic acceleration response index is treated here as the objective function to be maximized. The power (area of power spectral density function) and the intensity (magnitude of power spectral density function) are fixed and the critical excitation is found under these restrictions. It is shown that the original idea for stationary random inputs can be utilized effectively in the procedure for finding a critical excitation for nonstationary acceleration responses of nonproportionally damped structural systems. Several numerical examples are presented to demonstrate the characteristics of generalized time-varying frequency response functions for models with various stiffness and damping distributions.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 127 • Issue 6 • June 2001
Pages: 544 - 556
History
Received: Jul 18, 2000
Published online: Jun 1, 2001
Published in print: Jun 2001
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