Seismic Response of Multiple Span Steel Bridges in Central and Southeastern United States. II: Retrofitted
This article is a reply.
VIEW THE ORIGINAL ARTICLEPublication: Journal of Bridge Engineering
Volume 9, Issue 5
Abstract
Part I of this two-part paper evaluated the seismic response of typical multispan simply supported (MSSS) and multispan continuous steel girder bridges in the central and southeastern United States. The results showed that the bridges were vulnerable to damage resulting from impact between decks, and large ductility demands on nonductile columns. Furthermore, fixed and expansion bearings were likely to fail during strong ground motion. In this paper, several retrofit measures to improve the seismic performance of typical multispan simply supported and multispan continuous steel girder bridges are evaluated, including the use of elastomeric bearings, lead-rubber bearings, and restrainer cables. It is determined that lead-rubber bearings are the most effective retrofit measure for reducing the seismic vulnerability of typical bridges. While isolation provided by elastomeric bearings limits the forces into the columns, the added flexibility results in pounding between decks in the MSSS steel girder bridges. Restrainer cables, which are becoming a common retrofit measure, are effective in reducing the hinge opening in MSSS bridges with steel bearings. However, when used with elastomeric bearings, the restrainer cables negate the isolation effect of the bearings.
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References
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 9 • Issue 5 • September 2004
Pages: 473 - 479
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 17, 2002
Accepted: Dec 17, 2002
Published online: Aug 16, 2004
Published in print: Sep 2004
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