Fatigue-load models for girder bridges

Jeffrey A. Laman, Andrzej S. Nowak

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


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 measuremens 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 10- and 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.

Original languageEnglish (US)
Pages (from-to)726-733
Number of pages8
JournalJournal of Structural Engineering
Issue number7
StatePublished - Jul 1996

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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