Shear Modulus Evaluation of Three-ply Cross-laminated Kapur Wood Beams from Shear Moduli of Individual Laminae

Abstract

In 2009 Park et al. have developed an equation to calculate the shear modulus of the three-ply CLT from the shear moduli of individual laminae. The objective of this paper is to study experimentally the applicability of Park's equation for kapur wood. In order to use the equation, apparent moduli of elasticity, one is parallel and the other one is perpendicular to grain, have to be determined using 20 x 20mm beams of various depth over length ratios. Furthermore, static bending tests to obtain apparent moduli of elasticity were performed to six types of three-ply CLT, namely three CLT types with outer laminas grain parallel to the beam span and core laminae depth ratios of 30%, 50%, and 70% of total depth, and three CLT types with outer laminas grain perpendicular to the beam span and laminae core depth ratios of 30%, 50%, and 70% of total depth. In this study, the first three types of CLT is termed as parallel CLT and the last three types of CLT is termed as perpendicular CLT. Shear moduli of three-ply CLT obtained experimentally were compared to those computed using Park's equation. It can be concluded that the differences were very small.