Abstract
The strengthening of concrete structures using fibre reinforced polymer (FRP) materials has become a growing area in the construction industry over the last few years. Valuable research work is going on all over the world.This work is focused on theoretical, numerical and experimental analysis of the RC beam strengthened with a carbon fibre reinforced polymer (CFRP) sheet of the MBT-MBrace CF 640 type in a shear span of the RC beam.The aim of this paper is to present a simple design approach of calculation of a CFRP sheet contribution to the shear capacity of the RC beams and to compare results with values obtained from numerical analysis based on the finite element method (FEM) with ATENA-2D program being employed and with experimental results.The experiment confirms availability of CFRP sheets for shear strengthening of RC beams.
Highlights
Fibre-based composite materials (CM), often noted as fibre reinforced plastic (FRP), and their implementation in building industry are gaining on their popularity
Since the original work covers extended experiments, this paper presents only comparisons made on numerical and calculated values of the RC beams of one series
The externally bonded carbon sheet of the MBTMBrace CF 640 type is suitable as additional reinforcement for shear strengthening of RC beams
Summary
Fibre-based composite materials (CM), often noted as fibre reinforced plastic (FRP), and their implementation in building industry are gaining on their popularity. The A series has an internal shear reinforcement (stirrups). RC beams of the first A series were loaded to 70% of shear resistance of the RC beam. The corrupted beams were repaired (closing shear cracks) and strengthened by added external shear reinforcement. Flexibility, corrosion, magnetic and chemical resistance of the FRP materials are so much convincing that they are frequently used as an additional external reinforcement (e.g. lamella, sheet) or for strengthening of the RC beams, columns, slabs, walls, tunnels and soils, and in prestressed concrete. Their cost is higher than the cost of common building materials
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