DIGITAL STUDY OF THE BENDING BEHAVIOUR KNOWN AS «3 POINTS» OF TILES OF DIFFERENT SHAPES (FLEMISH, ROMANESQUE AND FLAT) IN CEMENT CONCRETE

The inadequacy of the experimental devices for testing the mechanical resistance of the tiles used to cover a roof should not be a reason for not properly understanding the problems associated with their bearing capacity and exploitation. This paper presents the results of a numerical study of the "3 point" bending behaviour of tiles of different geometric shapes (Flemish, Romanesque and Flat) in concrete cement. This work is governed by the finite element method implemented in structural computing software. It highlights the behaviour of the charged tiles when we know their geometric characteristics and some physical and mechanical characteristics of the material. This study found that the geometric shape of a tile significantly influences its load behaviour. For a normative load of 50 kg, the three tile shapes have a good bearing capacity because their bending deformations are all lower than the limit deformation of the bending concrete which is 3.5‰ according to the EC2 rules. However, the Flemish tile (0.2‰) bears more than the Romanesque tile (0.3‰) and the Flat tile (0.6‰). The breaking load of the flat tile is approximately 300 kg. As for the normal operating conditions and service life aspects, the compressive limit stress of the concrete (12 Mpa) and the allowable deflection of the tile (0.74 mm) are widely exceeded for the Plate tile (18.31 MPa and 1.01 mm). The Flemish tile (5.28 MPa and 0.24 mm) seems to offer a little more of the best conditions in service than the Romanesque tile (9.11 MPa and 0.16 mm).