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Strengthening of RC beams using bottom and side NSM reinforcement

Abstract

The allowable strain in fibre reinforced polymers einforcement is limited by design codes to avoid debonding.
The near-surface mounted (NSM) reinforcement technique has been proven to produce better anchorage behaviour compared to externally bonded reinforcement solutions. However, NSM solutions do not always eliminate debonding issues, with concrete cover detachment (CCD) typically occurring in RC beams strengthened for flexure. This experimental study investigated the efficiency of side mounted (S) compared to bottom mounted (B) NSM bars to prevent CCD. The experimental results were compared to models available in the literature that predict the observed failure modes and the crack spacing in the NSM anchorage zone. Compared to B-NSM, the S-NSM solution was successful in avoiding brittle CCD failure and showed increased rotational capacity and energy dissipation at failure. Existing CCD debonding models were found to be conservative.
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Category

Academic article

Language

English

Author(s)

  • Cristian Sabau
  • Cosmin Popescu
  • Gabriel Sas
  • Jacob Wittrup Schmidt
  • Thomas Blanksvärd
  • Björn Täljsten

Affiliation

  • SINTEF Narvik
  • Technical University of Denmark
  • Luleå University of Technology

Year

2018

Published in

Composites Part B: Engineering

ISSN

1359-8368

Volume

149

Page(s)

82 - 91

View this publication at Norwegian Research Information Repository