The use of Fibre Reinforced Concrete (FRC) has gained considerable attention in the last few years, particu-larly when crack propagation control is of primary importance, i.e. in beams when shear reinforcement is partly or totally absent. Many experiments available in the literature showed that fibres limit the growth of shear inclined crack, give visible warning prior the structure collapse and also provide a stable and diffused crack pattern within the shear critical area. However, the issue of size effect in members containing steel fibres, has not been deeply investigated and evaluated yet. In this context, nine experimental tests on full-scale beams (six with steel fibres and three with plain concrete only), with a depth ranging from 0.5 m up to 1.5 m, are herein presented. Experimental results will be extensively evaluated in terms of strength, ductility, shear cracking, collapse mechanism and effect of fibres. Moreover an extensive parametrical numerical study, performed by means of a FE program based on the Modified Compression Field Theory (MCFT), suitably adapted to FRC materials, will be presented.

Influence on Shear Strength of Fibre Reinforced Concrete: Experimental and Numerical Study on Deep Beams

Conforti Antonio
;
Minelli Fausto;Plizzari Giovanni
2012-01-01

Abstract

The use of Fibre Reinforced Concrete (FRC) has gained considerable attention in the last few years, particu-larly when crack propagation control is of primary importance, i.e. in beams when shear reinforcement is partly or totally absent. Many experiments available in the literature showed that fibres limit the growth of shear inclined crack, give visible warning prior the structure collapse and also provide a stable and diffused crack pattern within the shear critical area. However, the issue of size effect in members containing steel fibres, has not been deeply investigated and evaluated yet. In this context, nine experimental tests on full-scale beams (six with steel fibres and three with plain concrete only), with a depth ranging from 0.5 m up to 1.5 m, are herein presented. Experimental results will be extensively evaluated in terms of strength, ductility, shear cracking, collapse mechanism and effect of fibres. Moreover an extensive parametrical numerical study, performed by means of a FE program based on the Modified Compression Field Theory (MCFT), suitably adapted to FRC materials, will be presented.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/502456
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