Abstract
The authors of this technical paper develop a fatigue-live-load model for steel girder bridges. The database for the model is created from weigh-in-motion (WIM) measurements. Five bridge structures were chosen for testing to establish 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. Measurements of the stress cycles were taken at midspan of all bridge girders and are presented as cumulative distribution functions. Through the WIM measurements, the authors confirm that truck loads are strongly site-specific. The findings also reveal a significant variation in stress spectrum between girders. A three-axle truck is proposed to represent truck traffic; for sites with 10- and 11-axle trucks, an additional four-axle truck is proposed. The newly developed model is verified using fatigue-damage analysis to compare the model with measured results.
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