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Shear Resistance of GFRP Reinforced Concrete Beams
The shear resistance of seven reinforced concrete beams were tested, as part of a M.Sc. thesis, using concrete strength between 53.8 and 70.3 MPa, with GFRP (glass fiber reinforced plastics) bars as flexure reinforcement, with and without steel shear reinforcement, a/d equal to 2.5. The beams were 150 x 300 x 3000 mm, with variable longitudinal flexural and transversal ratio of reinforcement. The ratio of longitudinal flexural reinforcement varies between 1.60 and 3.26%, while the shear ratio of reinforcement varies between 0.096 e 0.150%. The results indicate that the two modifications proposed by Michaluk (1998), of multiplying all the concrete contribution (1) or only the flexural ratio of reinforcement in the concrete contribution (2), respectively, by the ratio of the elasticity modulus of the GFRP and the steel (Egfrp/Es), do not present good results. This indicates that the concrete contribution in the shear resistance is not susceptible to the plain ratio of elasticity modulus. The results also show that deflections obtained at "service load", corresponding to the maximum deflection in service allowed by the codes, are in average 1.24 times bigger than the estimated for the cracked section, indicating that the inertia adopted are bigger than the real one in this case.
Shear Resistance of GFRP Reinforced Concrete Beams
The shear resistance of seven reinforced concrete beams were tested, as part of a M.Sc. thesis, using concrete strength between 53.8 and 70.3 MPa, with GFRP (glass fiber reinforced plastics) bars as flexure reinforcement, with and without steel shear reinforcement, a/d equal to 2.5. The beams were 150 x 300 x 3000 mm, with variable longitudinal flexural and transversal ratio of reinforcement. The ratio of longitudinal flexural reinforcement varies between 1.60 and 3.26%, while the shear ratio of reinforcement varies between 0.096 e 0.150%. The results indicate that the two modifications proposed by Michaluk (1998), of multiplying all the concrete contribution (1) or only the flexural ratio of reinforcement in the concrete contribution (2), respectively, by the ratio of the elasticity modulus of the GFRP and the steel (Egfrp/Es), do not present good results. This indicates that the concrete contribution in the shear resistance is not susceptible to the plain ratio of elasticity modulus. The results also show that deflections obtained at "service load", corresponding to the maximum deflection in service allowed by the codes, are in average 1.24 times bigger than the estimated for the cracked section, indicating that the inertia adopted are bigger than the real one in this case.
Shear Resistance of GFRP Reinforced Concrete Beams
Melo, Guilherme Sales (author) / Rayol, Jorge Antonio (author)
Rehabilitating and Repairing the Buildings and Bridges of the Americas Conference 2001 ; 2001 ; Mayaguez, Puerto Rico, United States
2002-03-28
Conference paper
Electronic Resource
English
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