Design of SFRC structural elements: post-cracking tensile strength measurement |
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Authors: | Renaud de Montaignac Bruno Massicotte Jean-Philippe Charron Ali Nour |
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Affiliation: | 1.Department of Civil, Geological and Mining Engineering,Ecole Polytechnique of Montréal,Montreal,Canada;2.Hydro-Québec,Montreal,Canada |
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Abstract: | Utilisation of steel fibre reinforced concrete (SFRC) for designing structural members requires knowledge of the post-cracking
tensile response. This paper reviews the experimental characterisation tests and subsequent analysis commonly used for determining
the post-cracking tensile properties of SFRC. The experimental program supporting this investigation comprised five different
SFRC mixes with fibre volumes ranging from 0.75 to 1.25% used to fabricate a set of characterisation specimens for uniaxial
tension tests, notched beam tests and round panel tests carried out in parallel with an extensive experimental program on
large scale beams. Characterisation test results allowed a comparison between direct stress–crack opening measurements and
the stress–crack openings retrieved from the inverse analysis of bending tests. Discrepancies in post-cracking tensile results
obtained with the three types of tests are analyzed and related mainly to test configurations, the presence of a predefined
crack, support conditions, fibre orientation, and cracked surface size. Results obtained using material characterisations
are then applied to the reproduction of the structural behaviour of large scale beams, documented in a companion paper. |
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