Thermal Behavior of IDOT Integral Abutment Bridges and Proposed Design Modifications

The Illinois Department of Transportation (IDOT) has increasingly constructed integral abutment bridges (IABs) over the past few decades, similar to those in many other states. Because the length and skew limitations currently employed by IDOT have not necessarily been based on rigorous engineering analyses, an extensive 3-D parametric study has been performed, complemented by installation of field monitoring equipment on two recently constructed bridges, to potentially expand the use of IABs in Illinois. Some notable findings from this study include: (1) IAB configuration with extreme skew (> 60°) can perform well with proper detailing; (2) H-pile webs oriented parallel to the longitudinal axis of the bridge, regardless of skew, substantially reduces weak-axis bending; (3) compacted backfill reduces pile stresses; (4) live loads affect thermally induced pile stresses; (5) longer intermediate spans tend to increase pile stresses; and (6) time-dependent behaviors, such as concrete shrinkage, may significantly influence maximum pile stresses. Based on these findings, a more rigorously developed set of recommendations for maximum IAB lengths and skews in Illinois are proposed.

  • Record URL:
  • Availability:
  • Supplemental Notes:
    • A report of the findings of ICT-R27-55 Instrumentation & Monitoring of Extreme Integral Abutment Bridges in Illinois.
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  United States  61801-2352

    Illinois Department of Transportation

    Bureau of Materials and Physical Research
    126 East Ash Street
    Springfield, IL  United States  62704-4766

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Olson, Scott M
    • Holloway, Kurt P
    • Buenker, Jason M
    • Long, James H
    • LaFave, James M
  • Publication Date: 2013-5


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01484935
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-ICT-12-022, ICT-12-022, UILU-ENG-2012-2025
  • Contract Numbers: R27-55
  • Created Date: Jun 25 2013 1:21PM