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A platform for research: civil engineering, architecture and urbanism
Retrofitting of reinforced concrete beams with CARDIFRC
A new retrofitting technique based on a material compatible with concrete overcomes some of the problems associated with the current techniques based on externally bonded steel plates and FRP (fiber reinforced polymer) laminates which are due to the mismatch of their tensile strength and stiffness with that of the conrete structure being retrofitted. The key advange of CARDIFRC mixes for retrofitting is that unlike steel and FRP, their tensile strength, stiffness, and coefficient of linear thermal expansion are comparable to that of the material of the parent member. This paper introduces an analytical model. First the application of these materials for retrofitting of beams is discussed. Following an analytical model is introduced. Two different mixes of high-performance steel fiber reinforced concrete differing mainly by the maximum size of quartz sand used in the mix have been developed. Brass-coated steel fibers are used to prevent corrosion. The new technique using the CARDIFRC strip bonding system is a promising method for improving the flexural and shear behavior, as well as the serviceability of damaged concrete beams. The mechanical properties of CARDIFRC Mixes I and II are very similar, therefore there is no real difference in the behaviour of the beams retrofitted with either of these mixes. The moment resistance and load-deflection response of the beams retrofitted using this technique can be predicted analytically, providing that the strain hardening and tension softening response of concrete and CARDIFRC are properly taken into account.
Retrofitting of reinforced concrete beams with CARDIFRC
A new retrofitting technique based on a material compatible with concrete overcomes some of the problems associated with the current techniques based on externally bonded steel plates and FRP (fiber reinforced polymer) laminates which are due to the mismatch of their tensile strength and stiffness with that of the conrete structure being retrofitted. The key advange of CARDIFRC mixes for retrofitting is that unlike steel and FRP, their tensile strength, stiffness, and coefficient of linear thermal expansion are comparable to that of the material of the parent member. This paper introduces an analytical model. First the application of these materials for retrofitting of beams is discussed. Following an analytical model is introduced. Two different mixes of high-performance steel fiber reinforced concrete differing mainly by the maximum size of quartz sand used in the mix have been developed. Brass-coated steel fibers are used to prevent corrosion. The new technique using the CARDIFRC strip bonding system is a promising method for improving the flexural and shear behavior, as well as the serviceability of damaged concrete beams. The mechanical properties of CARDIFRC Mixes I and II are very similar, therefore there is no real difference in the behaviour of the beams retrofitted with either of these mixes. The moment resistance and load-deflection response of the beams retrofitted using this technique can be predicted analytically, providing that the strain hardening and tension softening response of concrete and CARDIFRC are properly taken into account.
Retrofitting of reinforced concrete beams with CARDIFRC
Instandsetzung von verstärkten Betonträgern mit CARDIFRC
Alaee, F.J. (author) / Karihaloo, B.L. (author)
Journal of Composites for Construction ; 7 ; 174-186
2003
13 Seiten, 18 Bilder, 7 Tabellen, 14 Quellen
Article (Journal)
English
Retrofitting of Reinforced Concrete Beams with CARDIFRC
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