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Effects of bending and heat on the ductility and fracture toughness of flange plate.

File Language:
English


Details

  • Alternative Title:
    Project title: Performance and Effects of Punched Holes and Cold Bending on Steel Bridge Fabrication
  • Creators:
  • Corporate Creators:
    Texas Transportation Institute
  • Corporate Contributors:
    Texas. Dept. of Transportation. Research and Technology Implementation Office
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/TX-10/0-4624-2
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Texas
  • Edition:
    Technical report; Sept. 2003-Aug. 2006.
  • Corporate Publisher:
    Texas Transportation Institute
  • Abstract:
    Bridge fabricators for the Texas Department of Transportation (TxDOT) have occasionally experienced the

    formation of cracks in flange plate during bending operations, particularly when heat is applied. Bending the

    flange plate is necessary for certain details used in the fabrication of steel highway girders such as dapped end

    details. Heat is sometimes used to assist in the bending operation, particularly to help reduce the forces required

    to bend the plate. This report documents the findings of a TxDOT-sponsored research project that investigated the

    possible causes of the cracking and developed recommendations to prevent the occurrence of such cracking.

    The research project investigated the cracking problem using both experimental and analytical studies. The

    experimental study involved the use of small tensile specimens loaded to different strain levels under varying

    temperature conditions. Strain levels up to 15 percent were investigated. Temperature conditions included testing

    at room temperature, 450ºF, and 1150ºF. The results showed that strain levels above 10 percent generally reduced

    the ductility and fracture toughness of the plate. Additionally, it was found that the application of heat during the

    bending process significantly reduced ductility and was the major contributor to the formation of cracks. A finite

    element study of the heating process was used to extend the results for the experimental study.

    As a secondary study, the fatigue behavior of non-loaded bolted connection details was investigated along

    with the influence of plate thickness. These details occur when gusset plates are bolted to flanges of girders.

    Unlike flange or web splices where the load must transfer out of the main member, the load in these details passes

    through the main plate, resulting in higher stresses around the bolt holes. Pre-tensioning the bolts normally shields

    the bolt holes from fatigue damage due to the resulting compressive stress field. This study found that for plate

    t hicknesses greater than 1.0 inches, a reduction in fatigue strength was warranted.

  • Format:
    PDF
  • Funding:
    Project 0-4624
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:c2c7a3a9f57a9b5b7e6e6743f5c7e227d23c443502638a569ca1368bc3f13de3779f96bc66a90c07adeb0e1f6d06439ab73b51cc59b96b579dfe2db09c498f8e
  • Download URL:
  • File Type:
    Filetype[PDF - 1.84 MB ]
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