-Factor Parameterized Bridge Damage Fragility Curves
Publication: Journal of Bridge Engineering
Volume 12, Issue 4
Abstract
Damage fragilities describe the probability that a bridge will incur certain (discrete) damage states conditioned on the intensity of the earthquake it may experience. Reinforced concrete box girder highway overpass bridges are prevalent among the total inventory of bridges in California. For this class of bridges, a method for computing damage fragilities for three damage states (concrete cover spalling, longitudinal bar buckling, and column failure) based on the bridge force reduction factors ( -factors) is derived in this paper. Bridge damage fragilities are described by equations relating the median intensity and uncertainty of ground motion to discrete damage states of column concrete cover spalling, column bar buckling, and column failure using the bridge -factor as the principal parameter describing the bridge structure. Such damage fragility equations are furnished for earthquake intensities measured using pseudospectral acceleration and cumulative absolute displacement (CAD) in both the bridge longitudinal and transverse directions.
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Acknowledgments
This work was supported in part by the Earthquake Engineering Research Centers Program of the National Science Foundation under Award No. EEC-9701568 through the Pacific Earthquake Engineering Research Center. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the writers and do not necessarily reflect those of the National Science Foundation.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 4 • July 2007
Pages: 500 - 510
Copyright
© 2007 ASCE.
History
Received: Nov 21, 2005
Accepted: Jun 22, 2006
Published online: Jul 1, 2007
Published in print: Jul 2007
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