COMPORTENT STRUCTUREL DES POTEAUX EN BETON ARME RENFORCES PAR PRF SOUS CHARGEMENT EXCENTRE.
Keywords:
poteaux, PRF, NSM, charge, excentricité, confinement, résistance, déformationAbstract
Le confinement externe par des Polymères Renforcés de Fibres (PRF) est maintenant une technique largement mise en œuvre pour renforcer et réparer les poteaux en béton armé (BA). La grande majorité des resultats des essais realises concernent des cylindres de béton sous chargement axial concentrique. En pratique, les colonnes en BA ont souvent une section transversal de forme carrée ou rectangulaire et soumises à des charges excentriques. Plusieurs paramétres influent sur le comportement structurel de tels elements. Une nouvelle technique de renforcement nommée NSM (Near Surface Mounted) a été utilisée ces dernières années pour renforcer les éléments structuraux en flexion. On presente dans cet article certains principaux résultats emanent de l’effet des parametres tels que que le degré d’excentricité, le nombre des couches du renfort, l’élancement des poteaux,la forme de la section et la présence de bandes verticales. On s’intéresse particulieremnt aux gains de résistance et de ductilité.
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M . Daugevičius, J. Valivonis, A . Beinaravičius, T . Skuturna and M . Budvytis, Experimental Investigation of the Load Carrying Capacity of Eccentrically Loaded Reinforced Concrete Elements Strengthened with CFRP, International Procedia Engineering 57 ( 2013 ) 232 – 237.
X . Song, X. Gu, Y. Li, T. Chen and W. Zhang, Mechanical behavior of FRP-strengthened concrete columns subjected to concentric and eccentric compression loading. J. Compos. Constr. 2013, 17, 336–346.
Y-F. Wu and J. Cheng, Effect of load eccentricity on the stress–strain relationship of FRP-confined concrete columns, Composite Structures, 98 (2013) 228–241.
L . Bisby and M . Ranger, Axial–flexural interaction in circular FRP-confined reinforced concrete columns, Construction and Building Materials, 24 (2010) 1672–1681.
KN . Ghali, SH . Rizkalla, MA . Kassem, TM . Fawzy and MH . Mahmoud, FRP-confined circular columns under small eccentric loading. In: 5th Alexandria International Conference on Structural and Geotechnical Engineering, 20–22 December 2003.
M . NS. Hadi and I . BR Widiarsa, Behaviour of FRP wrapped square RC columns under different loading conditions, Procedia Engineering Volume 51, 2013, Pages 240-249.
Y . Si Youcef, S . Amziane and M . Chemrouk, CFRP confinement effectiveness on the behavior of reinforced concrete columns with respect to buckling instability, Construction and Building Materials 81 (2015) 81–92.
N . Zhong Tao, J.G. Teng, Lin-Rai Ran and L. Lam, Experimental behaviour of FRP-confined slender RC columns under eccentric loading, A volume in Woodhead Publishing Series in Civil and Structural Engineering 2004, Pages 203–212.
A . Parvin and W. Wang, Behavior of FRP jacketed concrete columns under eccentric loading. J. Compos. Constr. 2001, 5, 146–152.
T. M . Pham, X. Lei and M. N. S Hadi, Effect of eccentric load on retrofitted reinforced concrete columns confined with FRP. In B. Samali, D. J. Attard & J. Song (Eds.), 22nd Australasian Conference on the Mechanics of Structures and Materials (ACMSM22) (pp. 139-144). (2013).
T. Trapko and M . Musia, The effectiveness of CFRP materials strengthening of eccentrically compressed reinforced concrete columns, Archives of Civil and Mechanical Engineering Volume 11, Issue 1, 2011, Pages 249-262.
A . Parvin and D . Brighton, FRP Composites Strengthening of Concrete Columns under Various Loading Conditions. Polymers 2014, 6, 1040-1056.
D . Mostofinejad and A . Torabian, Experimental Study of Circular RC Columns Strengthened with Longitudinal CFRP Composites under Eccentric Loading: Comparative Evaluation of EBR and EBROG Methods, Journal of Composites for Construction 20(2):04015055 • September 2015.
P . Sadeghian, Ali R. Rahai; and Mohammad R . Ehsani, Experimental Study of Rectangular RC Columns Strengthened with CFRP Composites under Eccentric Loading, J. Compos. Constr. 2010.14:443-450.
Mohamed Reda Ali Elewa Emara. Bond Behavior of NSM FRP Strips in Concrete under Sustained Loading. Doctoral Thesis, University of Girona 2018.
Chellapandian Maheswaran. Rapid Repair of Severely Damaged Reinforced Concrete Columns under Combined Axial Compression and Flexure: An Experimental Study. Construction and Building Materials • April 2018.
Tamer El-Maaddawy1 and Amr S. El-Near-Surface-Mounted Composite System for Repair and Strengthening of Reinforced Concrete Columns Subjected to Axial Load and Biaxial Bending. J. Compos. Constr. 2011.15:602-614.
