Analysis of Prestressed Concrete Bridges to Failure

In order to better assess the condition of existing and new bridge systems it is necessary to understand how they would behave under loadings beyond elastic ranges. With about 30% of the 600,000 bridges in the country classified as structurally deficient or functionally obsolete, finding an accurate predictive method becomes necessary. Two prestressed concrete slab-on-girder bridges were modeled in ANSYS and analyzed to failure, each measuring 55 and 105 feet. The first part of this paper relates to inelasticity in the shorter bridge and will (1) demonstrate how the load distribution affects the behavior of each girder as the live load is increased up to the bridge’s ultimate capacity, (2) understand bridge systems performance in inelastic stages, and (3) predict the bridge’s ultimate capacity. It was found that the current bridge rating method underestimates considerably the analyzed bridge’s strength. In the second part of this study an inelastic effective flange width study of the longer bridge was carried out. Stress distributions across the deck horizontally and vertically are presented and discussed, as well as the bridge’s ultimate capacity prediction. Finite Element predictions are then compared to AASHTO LRFD.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References;
  • Pagination: 15p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01045904
  • Record Type: Publication
  • Report/Paper Numbers: 07-3492
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 8:10PM