Abstract
An examination of North American and European test floors for determination of uniform and concentrated load performances of wood joist floor panels shows that there is a wide variation in the required width to span aspect ratio (1.5 to 8.0) of the test floors. Although the test floors are intended to replicate real floors, there is a minimum width to span aspect ratio that is sufficient to simulate both uniform and concentrated load performances of floor panels. The minimum width to span aspect ratio is conservatively the effective width to span ratio of a one-way spanning plate model of the floor panel. A parametric study of the effective widths in bending of simply supported, fixed and continuous plate one-way models of floor panels has been carried out. An equation for the effective width of the models in terms of the span, thickness and mechanical properties has been derived. Theoretically, the upper bound of the effective width is of the order of 2.0 times the span. Subject to experimental validation, the derived effective width equation is recommended for specifying the size of test piece for determination of uniformly distributed and/or concentrated load performance of wood joist floor panels.
Résumé
L'examen de planchers nord-américains et européens utilisés lors d'essais visant à déterminer les performances de panneaux de plancher de solives sous chargement uniforme et concentré, démontre qu'il y a une grande variation dans le rapport d'aspect nécessaire (1,5 à 8,0) entre la largeur et la portée des panneaux de plancher utilisés. Bien que ces planchers copient une géométrie de plancher projetée, il existe un rapport d'aspect minimum critique qui simule les performances sous chargement uniforme et concentré des panneaux de plancher. Ce rapport minimum est implicitement le rapport d'aspect effectif d'un modèle de plaque couvrant unilatéralement le panneau de plancher. Une étude paramétrique des largeurs effectives en flexion de tels modèles de plaques, simplement soutenues, fixes et continues, a été effectuée. Une équation a été dérivée pour déterminer la largeur effective des modèles en termes de portée, d'épaisseur et de propriétés mécaniques. Théoriquement, la limite supérieure de la largeur effective est de l'ordre de 2,0 fois la portée. Soumise à validation expérimentale, cette équation est recommandée pour spécifier la taille de l'élément étudié en vue de déterminer les performances sous chargement uniforme et concentré des panneaux de plancher en bois.
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Abbreviations
- biso :
-
effective width of one-way isotropic plate or panel
- borth :
-
effective width of one-way orthotropic plate or panel
- Ex, Ey :
-
bending moduli of elasticity in the major and minor axes axis of plate or panel, respectively
- Gxy, Gyx :
-
panel shear or shear-through-the-thickness moduli of rigidity in the major and minor axes of plate or panel, respectively
- Gxz, Gyz :
-
planar shear or shear-in-plane moduli of rigidity in the major and minor axes of plate or panel, respectively
- L:
-
span of plate or panel
- t:
-
thickness of plate or panel
- W:
-
width of panel or spacing of blockings
- x-axis:
-
major axis, principal axis in the plane of plate or panel with greater bending strength and stiffness
- x, y, z:
-
rectangular Cartesian and material property axes
- y-axis:
-
minor axis, direction in the plane of plate or panel that is at right angles to the major axis
- z-axis:
-
axis normal to the x-y plane or the plane of plate or panel
- vx, vy :
-
Poisson's ratios in bending in the major and minor axes of plate or panel, respectively
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Thomas, W.H. Test-piece size for uniformly distributed and concentrated load performance assessment of wood floor panel. Mat. Struct. 37, 732–739 (2004). https://doi.org/10.1007/BF02480519
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DOI: https://doi.org/10.1007/BF02480519