Evaluation of connection performance of various mixed species CLTs for furniture-style joinery

Abstract

This study investigated the connection performance of various mixed-species cross-laminated timber (CLT) panels used in furniture-style joinery. A combination of yellow-poplar and southern pine were used to assesses the mechanical performance of L-shaped dowel and lap joints under compression and tension loads. Mechanical testing was conducted to evaluate the connection moment resistance of each joint configuration. Dowel joints generally exhibited higher connection moment resistance, particularly under compression, which was attributed to superior mechanical interlocking and load distribution. Conversely, lap joints demonstrated higher variability in performance, with some configurations showing inconsistency, particularly under tension. Failure modes, such as delamination and rolling shear, were observed, highlighting the need for improved adhesion and joint design. These findings suggest that dowel joints are the preferred joinery method due to higher compressive strength. In contrast, lap joints may benefit from optimization in adhesive bonding techniques to enhance performance under tension. This research provides valuable insights into the structural integrity and durability of CLT joinery, guiding future improvements in design and application for engineered wood products.