MODELING EXTREME VEHICLE LOADS ON HIGHWAY BRIDGES. STRUCTURAL LOADS ANALYSIS AND SPECIFICATIONS PROJECT

Alternative probabilistic models of the lifetime maximum load are compared for bridge spans which may be loaded by multiple vehicles. Several vehicles crossing a bridge are modeled by the random spaces between vehicles and the random vehicle weights. Simulation tests confirm the validity of single-random-variable-per-truck models. Several stochastic models of bridge response are explored--A simulation-based model which identifies the random coincidence of multiple trucks (groups) on the bridge; a simplified version using the entire weight of a 'platoon' of trucks; and a non-simulation, discrete position (slot) model for congested traffic loading. Results from these models indicate that the congested traffic may take the dominant contribution to the extreme load event for long and even medium span bridges. A model of the contrasting free-flowing traffic may be limited to a few group sizes or a simplified lower-bound approximation.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139

    National Science Foundation

    1800 G Street, NW
    Washington, DC  United States  20550
  • Authors:
    • Larrabee, R D
  • Publication Date: 1978-9

Media Info

  • Pagination: 200 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197972
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: R-78-27
  • Contract Numbers: NSF-ENV73-00345-A02
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM