Experimental and Analytical Investigation of a 64-year Old Prestressed Beam Retrofitted with External Post-Tensioning

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Lena Leicht - , Chair of Concrete Structures (Author)
  • Carin L. Roberts-Wollmann - , Virginia Polytechnic Institute and State University (Author)
  • Ioannis Koutromanos - , Virginia Polytechnic Institute and State University (Author)
  • Matthew H. Hebdon - , University of Texas at Austin (Author)
  • Oliver Mosig - , Chair of Concrete Structures (Author)

Abstract

This paper presents an experimental investigation of a 64-year-old, full-scale, simply supported, prestressed bridge girder retrofitted with external posttensioning. The specific retrofit can be used to increase the flexural strength of corrosion-damaged prestressed beams. The test specimen, taken from a bridge located in Virginia, was subjected to monotonically increasing loads until the occurrence of a diagonal compression failure in the vicinity of one of the external tendon anchor blocks. The experimental test was accompanied by finite-element analyses, aimed to elucidate the failure mode and quantify the impact of the repair on the capacity of damaged beams. Simplified calculations based on strut-and-tie models and design code guidelines are found to give satisfactory estimates of the failure load, while also describing the principal aspects of the force transfer between the external tendons and the beam and the stress state in the immediate vicinity of the anchor blocks.

Details

Original languageEnglish
Article number4
Pages (from-to)04022015
Number of pages12
JournalJournal of Bridge Engineering
Volume2022
Issue number27
Publication statusPublished - 14 Feb 2022
Peer-reviewedYes

External IDs

ORCID /0000-0003-0398-2735/work/141543505

Keywords

Keywords

  • Concrete bridge, Prestressing, External posttensioning, Anchor block, Shear failure, Finite-element analysis, Strut-and-tie model