Damage Spectra: Characteristics and Applications to Seismic Risk Reduction
Publication: Journal of Structural Engineering
Volume 129, Issue 10
Abstract
Improved damage spectra are proposed to quantify the damage potential of recorded earthquake ground motion. The damage spectra are based on a combination of normalized hysteretic energy and deformation ductility of a series of inelastic single-degree-of-freedom systems. The damage spectra proposed will be zero if the structure remains elastic, i.e., no significant damage is expected, and will be unity if there is a potential of collapse. By varying a coefficient in their formulations, improved damage spectra can be reduced to commonly used normalized hysteretic energy or displacement ductility spectra. The damage spectra are computed for hundreds of horizontal ground motions recorded during the Landers and Northridge earthquakes. Source-to-site attenuation of the damage spectra in the Northridge earthquake is examined. Calibration of the damage spectra for an instrumented building damaged during the Northridge earthquake is also carried out. The improved damage spectra are promising for assessment of the performance-based seismic vulnerability of existing structures. For example, following an earthquake, near real-time contour maps of damage spectral ordinates at selected periods provide useful information on the spatial distribution of the damage potential of recorded ground motion for specific types of structures. The concept of damage spectra is also promising for carrying out performance-based design of new structures.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 129 • Issue 10 • October 2003
Pages: 1330 - 1340
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Feb 13, 2002
Accepted: Nov 4, 2002
Published online: Sep 15, 2003
Published in print: Oct 2003
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