The objective of the paper is to present the results of a bridge testing program carried out at the University of Michigan. Three bridges were selected; two on I-94 and one on US-23, all in Michigan. Selected bridges were instrumented and truck measurements were taken. Truck weights and axle configurations were determined from strains in lower flanges of bridge girders. The equipment was calibrated using special control trucks. Normal traffic flow was considered. For each truck, the recorded parameters include the time of passage, speed, lane designation, number of axles, axle loads and axle spacings. The trucks were run through influence lines to determine the maximum moments and shears for various bridge span lengths. The resulting moments and shears are plotted on the normal probability paper to facilitate statistical interpretations. The obtained load distributions are compared with the results of truck surveys carried out using the stationary scales at the truck weigh station on I-94, located near one of the tested bridges. The largest moments and shears were obtained for the bridge located far from the weigh station. On the other hand, the weigh station data compare well with truck loads observed on the bridge near the station. This indicates that overloaded trucks avoid going through the scales and the weigh station data are biased to less heavy vehicles.

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Civil Engineering
    Ann Arbor, MI  United States  48109
  • Authors:
    • Nassif, H
    • Nowak, A S
  • Publication Date: 1991


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 27 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00624882
  • Record Type: Publication
  • Report/Paper Numbers: GLCTTR 12-91/2
  • Files: TRIS, ATRI
  • Created Date: Sep 4 1993 12:00AM