Determination of the Forces in X-Frames in Curved Girder Bridges

Nationally, there still remain concerns regarding the design and construction of horizontally curved steel girder bridges due to difficult to predict girder displacements, fit-up issues, and locked-in stresses. One of the more complicated components to analyze and design are the X-frames due to complexities associated with how loads are transmitted throughout bridges. In the past, the configuration of X-frames were generally based upon standard designs which depended principally on gross-geometries and meeting minimum requirements. As such, there exists a unique opportunity to improve the design of these components. A recent study conducted on 5 curved girder bridges in Iowa revealed that for modest amounts of curvature that the primary girders can be designed using straight girder design principals. However, that study focused on bridges with steel diaphragms and primarily focused on the main bridge girders. Even more, that prior project focused on the influence of integral abutments, thermal expansion/contraction, and response under live-loads. As a result there are still many questions regarding how X-frames behave including during various phases of construction. The reconstruction of the interstate system in western Iowa offers a unique opportunity to monitor the behavior of several yet-to-be-constructed curved girder bridges. The data collected from these bridges form a strong baseline from which the understanding of whole-life forces can be expanded. These yet-to-be-constructed bridges will play a major role in the work briefly described below. Tasks include: Task 1 - Literature review; Task 2 - Monitor the behavior of select curved girder bridges during and following construction; Task 3 - Develop, validate, and extrapolate analytical models; and Task 4 - Final Report.

    Language

    • English

    Project

    • Status: Active
    • Funding: $175000
    • Contract Numbers:

      Addendum 594

      17-SPR0-019

    • Sponsor Organizations:

      Iowa Department of Transportation

      800 Lincoln Way
      Ames, IA  United States  50010
    • Managing Organizations:

      Iowa State University, Ames

      Center for Transportation Research and Education
      2711 South Loop Drive, Suite 4700
      Ames, IA  United States  50010-8664
    • Project Managers:

      McDonald, Norm

    • Performing Organizations:

      Iowa State University, Ames

      Center for Transportation Research and Education
      2711 South Loop Drive, Suite 4700
      Ames, IA  United States  50010-8664
    • Principal Investigators:

      Shafei, Behrouz

    • Start Date: 20161101
    • Expected Completion Date: 20191031
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01662943
    • Record Type: Research project
    • Source Agency: Iowa Department of Transportation
    • Contract Numbers: Addendum 594, 17-SPR0-019
    • Files: RiP, STATEDOT
    • Created Date: Mar 19 2018 12:27PM