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

Abstract

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