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Some bending properties of I-joists made with birch laminated plywood panels

Spulle U., Lipinskis I., Tuherm H.

Drewno : prace naukowe, doniesienia, komunikaty

2017

vol. 60, nr 200

125--134

Plywood is produced in standard size, therefore, after sawing it to the required size, a certain amount of coarse waste is generated, and the options of usage are limited due to the dimensions. Finding a way to use this coarse waste would mean increasing the amount of usable off cuts or a wasteless production, generating a product with a higher added value and limited costs of raw materials. The research looks at options to use plywood production coarse waste in the production of I-joist and wall framing that are both modern construction materials, and their utilization in construction has a good future prospect. Based on prior strength indicator tests and the specification of available coarse waste, the I-joist structure was chosen. Strength indicators of the manufactured beam samples were also tested to ensure the correct beam structures were selected. The research contains a comparison of indicator data obtained with the relevant strength indicators of I-joists produced by a different manufacturer. Comparing the stiffness EI values of the tested I-joists, they are at times lower than the relevant values of offered I-joists. It is worth mentioning that in all cases the width, depth and consecutively the cross-sectional area of the tested I-joists are slightly smaller than the relevant indicators of the offered I-joists. The indicator by which the tested I-joists are significantly lagging behind the other ones is their self-mass. When compared to LVL (Laminated Veneer Lumber) I-joists produced by “Finnjoist” having the smallest self-mass, the self-mass of the tested I-joists is 23.8% higher, but the moment of inertia is the lowest one at 49.1 cm2 of the relevant values of the offered I-joists.