Shear performance evaluation of Laran glulam beam-to-column T-Stub connector at different load positions

Abstract

Glued laminated timber (glulam) structures are increasingly favoured due to sustainability, lightweight properties, and excellent strength-to-weight ratio. Therefore, understanding the relationship between loading position, shear performance, and bearing strength of this structure is crucial for optimising structural connections and preventing premature failure. This study investigated the shear performance of beam-to-column connections using plantation-grown Laran glulam. Shear tests were conducted at two load application points: 160 mm (near the support) and 600 mm (in the cantilever region) from the column face. The results indicated that a shorter loading position (160 mm) leads to significantly higher shear stress values, ranging from 3.42 N/mm² to 3.91 N/mm², with a mean of 3.62 N/mm². In contrast, a longer loading position (600 mm) resulted in lower shear stress values, ranging between 0.24 N/mm² and 0.37 N/mm², with a mean of 0.33 N/mm². These findings indicated that reducing the load distance intensified stress concentration and affected the structural integrity. Additionally, these findings provided valuable insights into stress distribution and failure mechanisms in glulam structures. Identifying critical load distances can minimise stress concentrations; thus, optimising the connection design as proposed in this study can aid in improving structural stability and durability. Finally, these findings can serve as a reference for engineering guidelines and design standards, aiding in the development of more reliable glulam structures for practical applications in sustainable construction.