Bond of NSM systems in concrete strengthening - Examining design issues of strength, groove detailing and bond-dependent coefficient

Dong Keun Lee, Lijuan Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Research on the strengthening technique using near-surface mounted (NSM), fiber-reinforced polymer (FRP) composites has substantially advanced the knowledge on the bond-related issues such as bonded length, failure mechanisms, groove and bar dimensions, and local bond-slip behavior. In this study, several important design-related parameters that deserve more attention are carefully examined, including average bond strength, groove detailing, and bond-dependent coefficient. The accuracy of the existing analytical and semi-empirical models for average bond strength is assessed using the experimental data available in the literature. Optimum groove dimensions and a new empirical model for the bond-dependent coefficient are also proposed to complement the existing design guide for the NSM FRP technique used in concrete strengthening.

Original languageEnglish
Pages (from-to)1512-1522
Number of pages11
JournalConstruction and Building Materials
Volume47
DOIs
StatePublished - 30 Jul 2013

Keywords

  • Bond strength
  • Bond-dependent coefficient
  • Design
  • Fiber-reinforced polymer (FRP)
  • Groove detailing
  • Near-surface mounted (NSM)

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