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STATIC BENDING STRENGTH PERFORMANCES OF LAMINATED VENEER LUMBER (LVL)

This paper presents results on the static bending properties, modulus of rapture (MOR) and bending strength at proportional limit (SPL) of small specimens of Laminated Veneer Lumber (LVL). LVL is a composite of wood veneers with wood fibres primarily oriented along the length of grain direction of face veneers. In our case, LVL consisted of 17 and 29 plies of veneers Fir (Abies Alba Mill) with a thickness 3.2 mm. Small specimens were tested flatwise and edgewise in the plane of bending forces. Results of immediate temperatures influence on LVL bending strength indicated that linear temperature relationship can be used for MOR and SPL. Obtained results show that values are decreased with temperature increase. Analysis and results are given for a temperature range of -28 o C to 63 o C. Mean value obtained at the temperature of 60 o C are inside range of values for MOR of fir solid wood given in the literature for 20 o C and the moisture contents of 12-15%. Mean values of SPL amount 65.3% (edgewise) or 57.7% (flatwise) of maximum bending strength MOR, with coefficient of variations of 14.1 % and 17.9 % respectively, for observed temperature interval. In this work we observed LVL as a possible substitution for a solid wood in the production of joinery (windows). For this reason moisture content of wood ranged in the interval that is tolerated in the production of joinery (windows).