Transition of Allowable Stress Rating to Load and Resistance Factor Rating for Timber Bridges

One of the critical challenges facing the infrastructure community is that transportation agencies do not have sufficient information whether Allowable Stress rating (ASR) provides a better rating for timber bridges compared with Load and Resistance Factor rating (LRFR) or vice versa. In other words, simple analytical calculations will merely generate rating factors without knowing the actual performance of timber bridges. Refined investigations are, thus, necessary for addressing this practical matter in order to advance the state of the art of bridge rating technologies. The proposal discusses a comprehensive research program to elucidate the applicability of ASR and LRFR in timber bridges and aims to suggest an appropriate rating protocol. Furthermore, to strengthen the outcomes of the research, an experimental program is conducted with various retrofit methods and their implications will be examined. In so doing, bridge owners can properly manage built-environments and efficiently spend funds on maintenance and traffic control.


  • English


  • Status: Active
  • Funding: $160000
  • Contract Numbers:


  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    Mountain-Plains Consortium

    North Dakota State University
    Fargo, ND  United States  58108
  • Project Managers:

    Tolliver, Denver

  • Performing Organizations:

    Dept. of Civil Engineering

    University of Colorado Denver
    Denver, CO  United States 
  • Principal Investigators:

    Kim, Yail Jimmy

  • Start Date: 20211112
  • Expected Completion Date: 20240731
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers Program
  • Source Data: MPC-675

Subject/Index Terms

Filing Info

  • Accession Number: 01788883
  • Record Type: Research project
  • Source Agency: Mountain-Plains Consortium
  • Contract Numbers: 69A3551747108
  • Files: UTC, RIP
  • Created Date: Nov 18 2021 5:36PM