Issue 31

A. Abrishambaf et alii, Frattura ed Integrità Strutturale, 31 (2015) 38-53; DOI: 10.3221/IGF-ESIS.31.04 51 (a) (b) (c) (d) (e) (f) Figure 16 : Relationship between the fibre distribution, the fibre orientation factor and the post-cracking parameters: (a) peak stress, (b) , (c) and (d) stress at a 0.3, 1 and 2 mm crack width, respectively; (e) and (f) energy absorption up to 1 and 2 mm crack width, respectively. 4. In this study it was also evidenced that the fibre orientation in a laminar specimen is completely different from the one in a prismatic specimen. In laminar specimens fibres have a tendency to re-orient perpendicular to the concrete flow direction, while in prismatic specimens the fibre’s orientation tends to be parallel to the flow direction, [29, 30]. The determination of the tensile flexural strength of SFRC is usually performed in three-point bending tests on prismatic specimens as recommended by RILEM 162-TDF and EN-1465 [31, 32], however due to the different fibre orientation profiles in prismatic and planar structural elements, it could lead to an unrealistic tensile behaviour of laminar structural elements like panels, shells or walls.