LAUSR

Abstract The goal of this study was to analyze swelling (Sw) and shrinkage (Sh) behaviors of cross-laminated timber (CLT) made of different species and various lamina thickness and combinations. Compared to Sw and Sh of CLT made of larch, Sw and Sh of CLT made of pine showed lower values. As the thickness of CLT increased, Sw and Sh behaviors of CLT did not show a consistent trend. Strain in out-of-plane was approximately nine times higher than strain in in-plane. Strain distributions and strain values in major and minor directions were influenced by the crossed layer aligned in the longitudinal direction with the width (in-plane). When thicknesses of major layers in major and minor directions were decreased, in-plane strains were reduced. Considering the influence of species, thickness, and their combination on Sw and Sh behaviors of CLT, a new method for predicting dimensional changes of CLT with different moisture content was developed. The new method in this study showed a better accuracy in predicting Sw and Sh behaviors of CLT than the existing method in EN 16351.