Title: FRP ADHESION IN UNCRACKED AND CRACKED CONCRETE ZONES
Abstract: Fibre-Reinforced Polymer Reinforcement for Concrete Structures, pp. 183-192 (2003) No AccessFRP ADHESION IN UNCRACKED AND CRACKED CONCRETE ZONESG. MONTI, M. RENZELLI, and P. LUCIANIG. MONTIDipartimento di Ingegneria Strutturale e Geotecnica, Università La Sapienza di Roma, Via A. Gramsci, 53 – 00197 Roma, Italy, M. RENZELLIDipartimento di Ingegneria Strutturale e Geotecnica, Università La Sapienza di Roma, Via A. Gramsci, 53 – 00197 Roma, Italy, and P. LUCIANIDipartimento di Ingegneria Strutturale e Geotecnica, Università La Sapienza di Roma, Via A. Gramsci, 53 – 00197 Roma, Italyhttps://doi.org/10.1142/9789812704863_0015Cited by:78 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: The effectiveness of strengthening techniques employing FRP relies on the adhesion between the FRP plate/sheet and the concrete surface of the element to be strengthened, both in uncracked and cracked concrete zones. When mechanical fastening is not used, the efficiency of the strengthening element depends on the correct design of its anchorage zone. The maximum stress taken by an FRP plate/sheet depends on its anchorage length, along which it is transferred through a bond mechanism from the FRP to the concrete surface. The bond mechanism is highly non-linear and this renders the whole phenomenon extremely difficult to model. In this paper, a fully non-linear finite element is developed, which is then used to model anchorage zones. The accuracy of the FE in evaluating both the anchorage strength and the associated (effective) bond length in uncracked zones is demonstrated through correlation studies with experimental tests, by also modelling the strain and bond fields along the anchorage length. Predictive equations are proposed, with proper consideration of the nonlinear bond-slip behaviour at the plate/adhesive/concrete interface. For FRP sheets attached to concrete in cracked zones, the above-developed model has been used to predict the interaction between the two ends of an FRP sheet/plate between two adjacent cracks. The model has been also extended to include non-linear interaction with the existing reinforcement steel bars in order to evaluate the cracks width for serviceability checks (not shown in the paper). The accuracy of the model has been validated against a series of anchorage tests, purposely carried out. The model has then been used in a parametric study, from which two predictive equations for both the maximum stress and the anchorage length are obtained, accounting for the presence of cracks and for their spacing. FiguresReferencesRelatedDetailsCited By 78Experimental and Analytical Study of Bond Stress–Slip Behavior at the CFRP-to-Concrete InterfaceAbbas Fathi, Georges El-Saikaly and Omar Chaallal1 Apr 2023 | Journal of Composites for Construction, Vol. 27, No. 2Effects of sulfate and freeze–thaw cycles on the bond behavior of CFRP-concrete interfaceJiawei Zhang, Hang Li, Shengwei Liu, Lin Sun and Chenghong Yang et al.1 Mar 2023 | Construction and Building Materials, Vol. 368Shear strengthening of RC beams with NSM FRP. I: Review of strength modelsM.J. Jedrzejko, S.S. Zhang, Y. Ke, D. Fernando and X.F. 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Publication Year: 2003
Publication Date: 2003-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 136
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