Ductility of Welded Steel Column to Steel Cap Beam Connections

This report discusses the seismic behavior of a bridge bent systems that consist of round HSS piles, welded to a steel HP section cap beam. Past practice has typically utilized a simple fillet weld to complete the connection between the pile and cap beam. The results of this research indicate that the ductility capacity of this system is controlled by the configuration of the welded connection between the piles and cap beam. Six full scale bridge bent tests have been conducted at North Carolina State University to evaluate the performance of the system when subjected to simulated seismic loading. The two main goals of the research were to first evaluate the behavior of the system with a simple fillet weld connection and secondly to improve performance by investigating alternative weld configurations and connection details. The results indicate that the use of a simple fillet weld led to premature connection failure. Subsequent tests showed that the use of other weld configurations improved the capabilities of the system but were still inadequate for higher seismic regions. However, promising results were obtained from a connection in which the flexural hinge region was relocated away from the pile to cap beam connection weld.


  • English


  • Status: Completed
  • Funding: $171200.00
  • Contract Numbers:


  • Sponsor Organizations:

    Alaska Department of Transportation and Public Facilities

    2301 Peger Road
    Fairbanks, AK  United States  99701

    Federal Highway Administration

    Alaska Division
    709 West 9th Street, Room 851
    Juneau, AK  United States  99802-1648
  • Managing Organizations:

    Alaska Department of Transportation and Public Facilities

    Research & Technology Transfer
    2301 Peger Road
    Fairbanks, AK  United States  99709-5399
  • Performing Organizations:

    North Carolina State University, Raleigh

    Department of Civil Engineering, Campus Box 7908
    Raleigh, NC  United States  27695-7908
  • Principal Investigators:

    Kowalsky, Mervyn

  • Start Date: 20070701
  • Expected Completion Date: 0
  • Actual Completion Date: 20100228
  • Source Data: RiP Project 13874

Subject/Index Terms

Filing Info

  • Accession Number: 01462820
  • Record Type: Research project
  • Source Agency: Alaska Department of Transportation and Public Facilities
  • Contract Numbers: T2-07-03
  • Files: RiP, STATEDOT
  • Created Date: Jan 3 2013 2:11PM