Development of Live Load Distribution and Impact Factors for the Analysis of Implements of Husbandry Vehicles on Bridges

The size, geometry, and weight of farm equipment known as implements of husbandry (IoH) have increased and changed significantly to meet the needs of the modern agricultural industry. While intended primarily for use on the farm or in the field, there are inevitably occasions where IoH will travel on public roads and over public bridges. Through a review of the history of bridge design vehicles as well as the evolution of truck size and weight legislation, it is clear that the growth of IoH has far out-paced typical commercial vehicles. The result is that a portion of the IoH now in existence creates force effects on roads and bridges that exceed original design capacities. State departments of transportation (DOTs) and other bridge owners are faced with ensuring public safety and preservation of their bridge assets. Therefore, an envelope vehicle or vehicles is needed to represent the practical physical aspects and limits of a series of IoH vehicles. The envelop vehicle would allow a systematic and system-wide analysis to evaluate infrastructure inventory in a proactive, consistent, and effective manner. Also, the nature of the load transfer between the IoH vehicles and the supporting driving surface and structural members lacks definition for the purpose of structural analysis. Further, dynamic load impact factors that are specific to IoH vehicles are a critical research need. The objectives of this research are to define (1) a manageable set of "envelope" or "notional" vehicles that represent the fleet of husbandry-type vehicles and (2) live load and dynamic impact analysis factors for the distribution IoH-type vehicles to bridges and structures.


  • English


  • Status: Proposed
  • Funding: $650000.00
  • Contract Numbers:

    Project 12-110

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Dekelbab, Waseem

  • Start Date: 20150806
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 40206

Subject/Index Terms

Filing Info

  • Accession Number: 01572393
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-110
  • Files: TRB, RiP
  • Created Date: Aug 7 2015 1:01AM