Fatigue-Load Models for Girder Bridges
Publication: Journal of Structural Engineering
Volume 122, Issue 7
Abstract
A fatigue-live-load model is developed for steel girder bridges. The database for the model is obtained by weigh-in-motion (WIM) measurements. Five bridge structures were selected for testing to determine the site-specific truck parameters and component-specific stress spectrum. The database includes 22,000 truck files, each consisting of gross vehicle weight (GVW), axle weights, and axle spacing. Stress cycles were measured at the midspan of all bridge girders and results are presented as cumulative distribution functions. The WIM measurements confirm that truck loads are strongly site-specific. The results also indicate a significant variation in stress spectrum between girders. A three-axle truck is proposed to represent the truck traffic. For sites with 10and 11-axle trucks, an additional four-axle truck is proposed. The developed fatigue live load model is verified using fatigue-damage analysis to compare the model with measured results.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 122 • Issue 7 • July 1996
Pages: 726 - 733
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jul 1, 1996
Published in print: Jul 1996
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