Experimental evaluation of damaged rectangular reinforced concrete beams repaired with near surface mounted carbon fibre reinforced polymer

Abstract

International audienceAn experimental study has been carried out on damaged rectangular reinforced concrete beams, repaired with near surface mounted carbon fibre reinforced polymer materials. A total of 32 specimens were loaded to failure in a 4-point flexural test. The parameters considered are the rate of damage (20, 40 and 60%), the rate of strengthening and the type of strengthening materials (rods and strips). Concrete compressive strain, carbon fibre reinforced polymer strain, ultimate strength and load-deflection have been recorded to evaluate the response of the specimens. Results clearly demonstrate that the strengthening with near surface mounted carbon fibre reinforced polymer can enhance the structural performance of reinforced concrete beams in terms of both maximum strength and deformation. The effects of test parameters are evidenced and compared

Experimental and numerical investigation on low-strength RC beams strengthened with side or bottom near surface mounted FRP rods

“…The large scatter in results can be attributed to a lack of understanding of the development of bond stress along the FRP-concrete interface, especially at the end section where high interfacial stresses are mobilised (Bilotta et al, 2013;Oehlers, 1992;Sharaky et al, 2014;Smith & Teng, 2002a;Spadea et al, 2015;Zhang & Smith, 2017). To improve the bond strength of FRP reinforcement, the use of Near-Surface Mounted (NSM) FRPs was proposed as an alternative to strengthen flexural-dominated RC structures (Al-Mahmoud et al, 2009;Parretti & Nanni, 2004;Sena-Cruz et al, 2016;Al-Saadi et al, 2019;Gravina et al 2018;Laraba et al 2014).…”