Bridge Deck Replacement for Minimum Expected Cost Under Multiple Reliability Constraints
Publication: Journal of Structural Engineering
Volume 130, Issue 9
Abstract
The present paper investigates the effect of limit state selection (strength versus serviceability) on bridge deck life-cycle costs and thus on optimal repair strategies. Such a comparison may then help determine whether safety or functionality (or both) are important criteria when optimizing bridge life-cycle performance and costs. The structural element under consideration is a reinforced concrete bridge deck; namely, a State Highway Bridge in Colorado. Two limit states are considered: ultimate strength and serviceability. The exceedence of either of the limit states considered herein will result in deck replacement; namely, if the reliability index falls below a target reliability index or if widespread cracking and spalling occurs. The life-cycle cost analysis includes expected replacement costs as well as the random variability of material properties, loads, section dimensions, model errors, chloride penetration, and corrosion rates. Life-cycle costs can then be compared for strength and serviceability limit state violations. Life-cycle costs for deck replacement based on a serviceability limit state were generally larger than those obtained for the strength limit states. Hence, an unrealistically optimistic life-cycle cost will result when serviceability is not included in the analysis.
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Published In
Journal of Structural Engineering
Volume 130 • Issue 9 • September 2004
Pages: 1414 - 1419
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Sep 23, 2002
Accepted: Dec 9, 2003
Published online: Aug 16, 2004
Published in print: Sep 2004
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