Design & Performance of Highly Skewed Deck Girder Bridges

In Wisconsin, 30 percent of bridges built within the last 20 years have a skew angle larger than 20° (Wisconsin Department of Transportation [WisDOT] Bureau of Structures 2014). Twenty-two of these bridges had skew angles larger than 60°. The forces and stresses in skewed bridges are often larger than in rectangular plan bridges. These unusual force flows can complicate bridge analysis, and result in unexpected deck cracking and durability problems. The main project objective is to develop an understanding of the impact of skew on the analysis and performance of bridge elements. Particularly, the project will: (1) collect information on and inspect in-service bridges to identify issues caused by skew; (2) compare one-dimension (1-D), two-dimension (2-D) and three-dimension (3-D) analyses to identify limits of each analysis type; (3) validate the results of the analyses through field instrumentation of one prestressed concrete girder and one steel girder; (4) quantify deck stresses in the acute corner to recommend design details; (5) determine bearing forces and forces transmitted to substructures; (6) investigate innovative methods to accommodate skew. Examples include mixed bearing types, post-tensioned precast decks and disconnecting the end diaphragm and deck; and (7) prepare guidelines, design details and drawings for the WisDOT Bridge Manual. This research will provide designers and WisDOT with practical methods for analysis of bridges with high skew and guidelines for improving the performance of skewed bridges through detailing of deck, bearings and substructure units.

Language

  • English

Project

  • Status: Active
  • Funding: $150000
  • Sponsor Organizations:

    Wisconsin Department of Transportation

    4802 Sheboygan Avenue
    Madison, WI  United States  53707
  • Start Date: 20151118
  • Expected Completion Date: 20180531
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01590778
  • Record Type: Research project
  • Source Agency: Wisconsin Department of Transportation
  • Files: RiP, STATEDOT
  • Created Date: Feb 22 2016 2:46PM