STATIC BENDING STRENGTH PERFORMANCES OF CROSS-LAMINATED WOOD PANELS MADE WITH SIX SPECIES

In this study, with the view to using effectively Korean small and medium diameter woods as structural materials, the cross-laminated wood panels were manufactured by using six species of Korean softwoods and hardwoods, and static bending strength performances were investigated for each species. The static bending strength performances of parallel- and cross-laminated wood panels increased in proportion to the density of species on the whole. The static bending strength performances perpendicular to the grain were improved by cross-laminating the longitudinal direction lamina in the core, the extent of the increase was higher in softwoods than in hardwoods. The measured modulus of elasticity (MOE) of parallel-laminated wood panels and cross-laminated wood panels perpendicular to the grain of face laminae had a little difference with those calculated from true MOEs of individual laminae. However, the measured MOEs of cross-laminated woods parallel to the grain of face laminae were much lower than the estimated MOEs owing to the effect of deflection caused by shear force. The percentage of deflection caused by shear force versus total deflection ( Y s ) showed high values of 9.8%~34.0%, and the cross-laminated wood panels made with softwoods were found to be markedly higher than those made with hardwoods.