DYNAMIC STRESS ANALYSIS OF STEEL GIRDERS DURING TRANSIT OVER THE ROAD

The practice of hauling long (up to 140 feet) beam girders from the fabrication plant to their final destination (bridge construction site) has been carefully observed analyzed with respect to what appeared to be the worst possible damage. The handling of these girders in the fabrication plant prior to loading on the trucks was also observed and analyzed with respect to one handling procedure which appeared to potentially danaging-that of turning the girder about its longitudinal axis from upside down to the upright position by lifting one edge with a single crane. Experimental measurements of strain showed very little deformation of the girder during hauling except in a lateral bending mode about the weakest axis of inertia of the vertical axis while in transit). This mode of dynamic motion was analyzed with finite element solution already in existence and verified to fit the actual problem with experimental measurements on a model beam (about 1/7 scale in length). This motion then was used to (a) locate regions of highest bending strain so strain gages could be placed there on full-scale, actual beam girders being hauled over the road, and (b) to develop a correlation between observed lateral end motion of the beam and maximum bending strain which could then be used as a control parameter in the hauling operation. Strains developed by turning the beam in the fabrication plant were measured up to 10 times those in transit. These levels of strain are high enough to warrant some further recommendation to lift the beam at two points on an edge in turning it. (FHWA)

  • Corporate Authors:

    North Carolina State University, Raleigh

    Highway Research Program, P.O. Box 5993
    Raleigh, NC  United States  27607

    North Carolina Department of Transportation

    Division of Highways, P.O. Box 25201
    Raleigh, NC  United States  27611

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Bingham, W L
  • Publication Date: 1981-1

Media Info

  • Pagination: 48 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331738
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/NC-81/001, FCP 45L2-020
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Aug 15 1981 12:00AM