Bond strength of lap splices in FRP and TRM confined concrete: Behavior and design

Dionysios Bournas, Thanasis Triantafillou

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


The effectiveness of Fibre-Reinforced Polymer (FRP) and Textile-Reinforced Mortar (TRM) jackets was investigated experimentally and analytically in this study as a means of confining old-type reinforced concrete (RC) columns with limited capacity due to bond failure at lap splice regions. The local bond strength between lap spliced bars and concrete was measured experimentally along the lap splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.

Original languageEnglish (US)
Title of host publicationSeismic Evaluation and Rehabilitation of Structures
PublisherKluwer Academic Publishers
Number of pages17
ISBN (Print)9783319004570
StatePublished - 2014

Publication series

NameGeotechnical, Geological and Earthquake Engineering
ISSN (Print)1573-6059
ISSN (Electronic)1872-4671

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology


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