Effect of overloading on fatigue performance of reinforced concrete beams strengthened with externally post-tensioned carbon-fibre-reinforced polymer tendons

Ahmed Elrefai, Jeffrey S. West, Khaled A. Soudki

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This paper presents the results of an experimental and analytical study of the fatigue performance of reinforced concrete beams strengthened with externally post-tensioned carbon-fibre-reinforced polymer (CFRP) tendons. Two loading conditions prior to strengthening the beams were investigated: in-service loading and overloading. A total of 18 beams were tested to failure: three under monotonie loading and fifteen under fatigue loads. The CFRP tendons were post-tensioned to 40% of their ultimate capacity. The results demonstrated that overloading the beams had no discernable effect on the fatigue life of the strengthened beams. The strain-reduction approach for unbonded steel tendons was modified to account for using CFRP tendons and for the permanent deformations resulting from the overloading process. The loading history of the beams prior to and after post-tensioning was incorporated into a strain-life fatigue model to predict the fatigue life of the strengthened beams.

Original languageEnglish
Pages (from-to)1294-1307
Number of pages14
JournalCanadian Journal of Civil Engineering
Volume35
Issue number11
DOIs
Publication statusPublished - Nov 2008
Externally publishedYes

Keywords

  • Concrete beams
  • Damage
  • Fatigue
  • Fiber-reinforced polymer
  • Overloading
  • Post-tensioning
  • Strain life

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • General Environmental Science

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