A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of construction adhesive and joist variability on the deflection behavior of industrial wood floors
A total of 19440 structural floors of a geometry and material configuration consistent with those used in industrial construction in North America were numerically analyzed to determine their deflection characteristics under a constant uniformly distributed load of 145 lbf/ft2 (215 Pa). The intent of these analyses was to determin the effect of joist modulus of elasticity (MOE) (mean and variability) on the deflection behavior of industrial floors (made with glue-laminated (glulam) structural members covered by plywood sheathing) and to quantify the contribution of elastomeric construction adhesives (ECA) in reducing the deflection of such systems. The joist MOE was allowed to vary in a systematic fashion between 1250 (8.62) and 3250 (22.4) ksi (MPa) in increments of 250 ksi (1.72 MPa). In addition, the joist variability (at each MOE value) varied between coefficient of variation (COV) values of 0.025 to 0.150 in increments of 0.025. One hundred-eighty floors were evaluated at each mean MOE value and COV value for the joists. MOE values for each of the eleven joists in each floor were obtained via a statistical simulation process. All other sheathing and connector properties (nail slip modulus=25500 lbf/in. (4466 N/mm)) remained constant. After the 180 floors were analyzed using only nailed connections beween joist and sheathing, new random numbers were simulated (with the same mean and standard deviation) to produce 180 new floors for analysis with increased connection stiffness to reflect the contribution of the ECA used with the nails to attach sheathing to joist. The results indicated that ECA used with nails contributes positively to floor system stiffness. The magnitude of the contribution of ECA to reducing floor deflection under uniformly distributed loads was dependent in large part on the mean stiffness of the floor joists and to a much lesser extent on the COV of the joists. For joists of lower stiffness, the contribution of ECA had a more pronounced effect on mitigating the floor deflections. Reductions of nearly 6.3 % were realized when the mean joist MOE was 1250 ksi.
Effect of construction adhesive and joist variability on the deflection behavior of industrial wood floors
A total of 19440 structural floors of a geometry and material configuration consistent with those used in industrial construction in North America were numerically analyzed to determine their deflection characteristics under a constant uniformly distributed load of 145 lbf/ft2 (215 Pa). The intent of these analyses was to determin the effect of joist modulus of elasticity (MOE) (mean and variability) on the deflection behavior of industrial floors (made with glue-laminated (glulam) structural members covered by plywood sheathing) and to quantify the contribution of elastomeric construction adhesives (ECA) in reducing the deflection of such systems. The joist MOE was allowed to vary in a systematic fashion between 1250 (8.62) and 3250 (22.4) ksi (MPa) in increments of 250 ksi (1.72 MPa). In addition, the joist variability (at each MOE value) varied between coefficient of variation (COV) values of 0.025 to 0.150 in increments of 0.025. One hundred-eighty floors were evaluated at each mean MOE value and COV value for the joists. MOE values for each of the eleven joists in each floor were obtained via a statistical simulation process. All other sheathing and connector properties (nail slip modulus=25500 lbf/in. (4466 N/mm)) remained constant. After the 180 floors were analyzed using only nailed connections beween joist and sheathing, new random numbers were simulated (with the same mean and standard deviation) to produce 180 new floors for analysis with increased connection stiffness to reflect the contribution of the ECA used with the nails to attach sheathing to joist. The results indicated that ECA used with nails contributes positively to floor system stiffness. The magnitude of the contribution of ECA to reducing floor deflection under uniformly distributed loads was dependent in large part on the mean stiffness of the floor joists and to a much lesser extent on the COV of the joists. For joists of lower stiffness, the contribution of ECA had a more pronounced effect on mitigating the floor deflections. Reductions of nearly 6.3 % were realized when the mean joist MOE was 1250 ksi.
Effect of construction adhesive and joist variability on the deflection behavior of industrial wood floors
Die Wirkung von Klebstoff und Querbalkenvariabilität auf das Durchbiegungsverhalten von industriellen Holzfußböden
Pellicane, P.J. (author) / Robinson, G. (author)
Journal of Testing and Evaluation ; 27 ; 234-242
1999
9 Seiten, 9 Bilder, 1 Tabelle, 15 Quellen
Article (Journal)
English
British Library Online Contents
| British Library Online Contents | 1998
| British Library Online Contents | 1997