The present system of signposting substandard bridges in Ontario by a single load limit serves only as a vague warning that the bridge ahead is somewhat deficient. Truck drivers were observed to disregard the posting sign, since they know they can carry heavier loads across without causing any apparent damage to the bridge. This report describes the development of live loads and a new triple signposting system adopted as the basis of bridge capacity rating of existing bridges in the new Ontario highway bridge design code. The system employs the philosophy of ultimate limit states in evaluation of three levels of signposting using an appropriate loading model for each level. Adjustments to the calculated load-carrying capacity are made to account for the operational overloads beyond legal limits, inherent to human nature, and the odd distribution of loads on various axles in a partially loaded vehicle. This article is also included in Transportation Research Record No 664, Bridge Engineering, Vol 1 Proceedings of Conference Sept 25-27 1978. (TRRL)

  • Corporate Authors:

    Ontario Ministry of Transportation & Communic, Can

    1201 Wilson Avenue
    Downsview, Ontario M3M 1J8,   Canada 
  • Authors:
    • Agarwal, A C
    • Csagoly, P F
  • Publication Date: 1980

Media Info

  • Features: Figures; References;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00325180
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Apr 15 1981 12:00AM