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Bond of reinforcement in fibre reinforced concrete
The use of steel fibres in concrete leads to a higher loading capacity in bending, shear and punching shear. With the new German Recommendation DBV-Merkblatt 'Steel Fibre Reinforced Concrete' it is possible to use steel fibre reinforced concrete in the structural design for the mentioned ultimate limit states. Regarding the anchorage of rebars and for lapped splices no special design rules are included, only the transversal reinforcement can be omitted in certain situations. The bond mainly affects the cracking behaviour of reinforced concrete members. This paper outlines the experimental programme and its results on the bond performance of conventional rebars in steel fibre reinforced normal strength concrete (NSC) and high strength concrete (HSC). The two main tasks were the time development of the bond properties and the influence of fibres on bond. So, the hardened concrete properties and the bond behaviour were experimentally investigated at 3 and 28 days and collated with plain concrete. One of the main conclusions is that steel fibres reduce the risk of splitting of the concrete cover. Also the ductility of the bond is enlarged. Based on the presented tests it could be shown, that the bond behaviour is positively influenced by the steel fibres. A brittle failure by splitting of the concrete cover was avoided in both normal and high strength concrete. Additionally for HSC the maximum bond strength was increased by about 10 to 15%. Furthermore bond stiffness was higher due to the steel fibres, so the ascending branch of the bond stress-slip-relationship was influenced. In contrast fibres do not have a significant effect on the ultimate bond stresses in normal strength concrete. Therefore for structural design, the contribution of steel fibres to the bond strength is only interesting for HSC. However, for defining possible design values further tests are certainly necessary.
Bond of reinforcement in fibre reinforced concrete
The use of steel fibres in concrete leads to a higher loading capacity in bending, shear and punching shear. With the new German Recommendation DBV-Merkblatt 'Steel Fibre Reinforced Concrete' it is possible to use steel fibre reinforced concrete in the structural design for the mentioned ultimate limit states. Regarding the anchorage of rebars and for lapped splices no special design rules are included, only the transversal reinforcement can be omitted in certain situations. The bond mainly affects the cracking behaviour of reinforced concrete members. This paper outlines the experimental programme and its results on the bond performance of conventional rebars in steel fibre reinforced normal strength concrete (NSC) and high strength concrete (HSC). The two main tasks were the time development of the bond properties and the influence of fibres on bond. So, the hardened concrete properties and the bond behaviour were experimentally investigated at 3 and 28 days and collated with plain concrete. One of the main conclusions is that steel fibres reduce the risk of splitting of the concrete cover. Also the ductility of the bond is enlarged. Based on the presented tests it could be shown, that the bond behaviour is positively influenced by the steel fibres. A brittle failure by splitting of the concrete cover was avoided in both normal and high strength concrete. Additionally for HSC the maximum bond strength was increased by about 10 to 15%. Furthermore bond stiffness was higher due to the steel fibres, so the ascending branch of the bond stress-slip-relationship was influenced. In contrast fibres do not have a significant effect on the ultimate bond stresses in normal strength concrete. Therefore for structural design, the contribution of steel fibres to the bond strength is only interesting for HSC. However, for defining possible design values further tests are certainly necessary.
Bond of reinforcement in fibre reinforced concrete
Holschemacher, Klaus (author) / Weiße, Dirk (author)
2004
10 Seiten, 5 Bilder, 4 Tabellen, 15 Quellen
Conference paper
English
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