Bending performances and rolling shear strength of nail-cross-laminated timber

Abstract

ABSTRACT This current research work was aimed to develop an innovative panel by combining the nail-laminated timber (NLT) and cross-laminated timber (CLT) into a single product named nail-cross-laminated timber (NCLT) to take advantage of both structural panel products in a single product as a structural member. To investigate the mechanical properties of the NCLT, its bending performance and rolling shear were examined and compared to those of conventional CLT and NLT floor panels. The NCLT and the CLT panels were fabricated in 3 layers such as the CLT. Polyurethane adhesive was used on the laminations. The cross layers of the NCLT were made of a 30-mm-thick vertically laminated NLT. The NLT floor panels were fabricated by vertically nailing the laminations using a zigzag nailing pattern. Results showed no significant differences in the bending strength properties of the three panel types. Both CLT and NCLT showed a comparable rolling shear strength, however, the rolling shear failure in the NCLT was much more ductile than that of the CLT. Overall, the NCLT panels indicated an appropriate short-term bending and rolling shear performances.