Title: FATIGUE-LOAD MODELS FOR GIRDER BRIDGES By Jeffrey A. Laman 1 and Andrzej S. Nowak/ Members, ASeE
Abstract: A fatigue-live-load model is developed for steel girder bridges. The database for the model is obtai~ed by ~eigh-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 con~isting of gross ~ehicl~ weight (GVW), axle weights, and axle spacing. Stress cycles were mea sured at the mtdspan of all bndge gtrders and results are presented as cumulative distribution functions. The WI~ .me~surements confirm that truc~ loads are strongly site-specific. The results also indicate a significant v.anatton 10 stress spectrum between girders. A three-axle truck is proposed to represent the truck traffic. For sites w~th l~- and ~ 1-axl~ trucks, an additional four-axle truck is proposed. The developed fatigue live load model IS venfied us10g fatigue-damage analysis to compare the model with measured results.
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: article
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