Structural Response of Reinforced Concrete Beams Strengthened in Flexure with Near Surface Mounted Fibre Reinforced Polymer Composite Strips. Experimental Results
Tomme: LIX (LXIII) Fascicle: 4 | 2013
Pages: 107-116
Abstract text:
This paper presents the results obtained from a series of tests performed on reinforced concrete (RC) beams strengthened in flexure with near surface mounted (NSM) carbon fibre reinforced polymer (CFRP) composite strips. In order to determine the overall stiffness and flexural capacity of the strengthened specimens, four-point bending tests were carried out under monotonic loading. For the beam strengthened with two CFRP strips, with the cross section of 1.2 × 18 mm, an increase in the load carrying capacity of 164% and a reduction of the deflection up to 12% was achieved, in comparison with the reference beam. For the specimens strengthened with three CFRP strips, with the cross section of 1.2 × 12 mm and 1.2 × 24 mm, an increase of the bearing capacity of 158% and 202% is obtained, in comparison with the control specimen. Failure mode for all the tested beams occurred by debonding in the form of concrete cover separation (CCS).
Key Words:
reinforced concrete; near surface mounted; carbon fibre reinforced polymer; concrete cover separation.
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