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Structural Engineering and Mechanics
  Volume 47, Number 6, September25 2013, pages 819-838
DOI: http://dx.doi.org/10.12989/sem.2013.47.6.819
 


Flexural behaviour of reinforced low-strength concrete beams strengthened with CFRP plates
Mohcene Boukhezar, Mohamed Laid Samai, Habib Abdelhak Mesbah and Hacene Houari

 
Abstract
    This paper summarises the results of an experimental study to investigate the flexural behaviour of reinforced concrete beams strengthened using carbon-fibre reinforced polymer (CFRP) laminate in fourpoint bending. The experimental parameters included are the reinforcing bar ratio ps and preload level. Four bar ratios were selected (ps = 0.13 to 0.86%), representing the section of two longitudinal tensile reinforcements, with diameters of 8, 14, 16, and 20 mm in order to reveal the effect of bar ratio on failure load and failure mode. Eight beams that could be considered \"full-scale\" in size, measuring 200 mm in width, 400 mm in total height and 2300 mm in length, were tested. Three beams were selected with different bar ratios (p1, p2, p3), and considered as control specimens (without ), while three other beams identical to the control beams with the same CFRP laminates ratio and a seventh beam with pmin (the lowest bar ratio) were also used. In the second part of the study, two beams with the bar ratio p2 were preloaded at two levels, 50 and 100% of their ultimate loads, and then repaired. This experimental investigation was consolidated using an analytical model. The experimental and analytical results indicate that the flexional capacity and stiffness of strengthened and repaired beams using CFRP laminate were increased compared to those of control beams, and the behaviour of repaired beams was nearly similar to the undamaged and strengthened beams; unlike the ductility of strengthened beams, which was greatly reduced compared to the control.
 
Key Words
    four-point bending; failure; CFRP-strengthening; repair; preload; reinforced concrete; beam
 
Address
Mohcene Boukhezar, Mohamed Laid Samai, Hacene Houari : Department of Civil Engineering, Faculty of Technology Sciences, University of Constantine 1, Algeria, Route Ain Bey - 25 000, Constantine 25000, Algeria
Habib Abdelhak Mesbah : L.G.C.G.M., INSA of Rennes, University of Rennes 1, France
 

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