The possible premature failure due to debonding between the adhesive layer and concrete is one of the key issues in FRP-strengthened RC beams; debonding can occur at the beam end (end debonding) or in the cracked zone (intermediate debonding). In the present paper, a mechanical model considering non-linear stress-strain relationships for concrete, steel and FRP-to-concrete interface is presented, with the aim of simulating the behavior of RC beams strengthened by externally bonded FRP plates. The finite element numerical procedure obtained by implementing such a model is also validated by comparisons with available experimental data. Finally, behavioral observations are pointed out, which could be utilized to address the research of simplified formulae for determining the effective value of FRP strain at debonding and enhancing the corresponding proposals in current codes and standards. © 2007 Elsevier Ltd. All rights reserved.

Formulation and validation of a theoretical model for intermediate debonding in FRP-strengthened RC beams

FAELLA, Ciro;MARTINELLI, Enzo;
2008-01-01

Abstract

The possible premature failure due to debonding between the adhesive layer and concrete is one of the key issues in FRP-strengthened RC beams; debonding can occur at the beam end (end debonding) or in the cracked zone (intermediate debonding). In the present paper, a mechanical model considering non-linear stress-strain relationships for concrete, steel and FRP-to-concrete interface is presented, with the aim of simulating the behavior of RC beams strengthened by externally bonded FRP plates. The finite element numerical procedure obtained by implementing such a model is also validated by comparisons with available experimental data. Finally, behavioral observations are pointed out, which could be utilized to address the research of simplified formulae for determining the effective value of FRP strain at debonding and enhancing the corresponding proposals in current codes and standards. © 2007 Elsevier Ltd. All rights reserved.
2008
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4677989
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 39
  • ???jsp.display-item.citation.isi??? 35
social impact