Drift Spectrum: Measure of Demand for Earthquake Ground Motions
Publication: Journal of Structural Engineering
Volume 123, Issue 4
Abstract
A new measure of the demand of earthquake ground motions on structures is presented. This measure, called the drift spectrum, is particularly useful for near-field earthquake motions that contain distinct pulses. Like the well-known response spectrum, the drift spectrum is based on a linear system model. However, the new spectrum differs from the response spectrum in that it is based on a continuous shear-beam model rather than a single-degree-of-freedom model. The continuous model more accurately predicts interstory drift than does a single-degree-of-freedom model for pulse-like excitations. The drift spectrum could be used for design in a manner analogous to the use of the response spectrum. Examples of near-field drift spectra for the Landers, Northridge, and Hyogo-ken Nanbu earthquakes records are provided. The nature of these spectra is discussed and conclusions are drawn regarding the specification of drift demand for structural design.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 123 • Issue 4 • April 1997
Pages: 397 - 404
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Apr 1, 1997
Published in print: Apr 1997
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