2260 - Shrinkage Induced Deformation in Steel Bridges Made Composite with Concrete Deck Slabs - Phase 2

Concrete bridge decks are typically cast upon steel or precast concrete girders. The new concrete begins to change volume which can be caused by increased or decreased temperature, and by the natural drying shrinkage of concrete. It has been suggested that the excessive deflections are caused by drying shrinkage of concrete. Newly cast concrete will shrink. When new concrete is cast atop steel girders, the shrinkage of the concrete can cause the composite beam to deflect downward. These downward deflections were attributed, in part, to concrete shrinkage. However, shrinkage is only one consideration. Other considerations can include errors in design, errors in the computation of estimated deflections, or unexpected deformations of the forms, framing systems and/or screed rails that support the bridge decks during casting. All of these factors and perhaps more should be considered in a complete and thorough investigation. This research will investigate bridges constructed in Oklahoma where concrete decks are cast atop steel girders. The research team will specifically look at bridges that have experienced problems with excessive deflection and/or poor ride quality. The proposed research will investigate the shrinkage characteristics of concrete, examine analytically the likely effects of shrinkage on composite steel girder bridges, examine experimentally the system of concrete and steel bridge beams, perform field investigations of existing bridges, and develop rationale for the cause of excessive deflections. The work plan will provide reasonable and practical solutions that can help to mitigate excessive deflections and poor ride quality.

    Language

    • English

    Project

    • Status: Completed
    • Funding: $100,000.00
    • Contract Numbers:

      SP&R 2260

      SPRY-0010(64)RS

    • Sponsor Organizations:

      Oklahoma Department of Transportation

      200 NE 21st Street
      Oklahoma City, OK  United States  73105
    • Project Managers:

      Peters, Walt

    • Performing Organizations:

      Oklahoma State University, Stillwater

      School of Civil & Environmental Engineering
      207 Engineering South
      Stillwater, OK  United States  74078
    • Principal Investigators:

      Russell, Bruce

    • Start Date: 20151001
    • Expected Completion Date: 20160930
    • Actual Completion Date: 0
    • Source Data: RiP Project 35689

    Subject/Index Terms

    Filing Info

    • Accession Number: 01539810
    • Record Type: Research project
    • Source Agency: Oklahoma Department of Transportation
    • Contract Numbers: SP&R 2260, SPRY-0010(64)RS
    • Files: RiP, STATEDOT
    • Created Date: Oct 3 2014 1:00AM