Bending behaviour and manufacturing process of non-glue laminated timber made of domestic wood in Taiwan

Abstract

The paper is focused on the composite behaviour of laminated wooden beams with different shear connections According to CNS 11031 this study configures symmetric composition of heterogeneous-grade laminated beam labelled as E95-F270 and E85-F255 The 12 laminated beams apply Taiwanese domestic wood which is named Japanese cedar and possess the cross-section of 150 mm x 308 mm and length of 3 6 m Each beam is composed of eight laminas with thickness of 8 mm The 12 specimens comprise three types of shear connections i e adhesive hardwood dowel and self-tapping screw (STS) Among the 12 beams 6 of them are laminated by means of hardwood dowel whose diameter is 20 mm The dowels are inserted 90-degree in one row with spacing of 10 15 and 20 cm Four beams are transversally laminated by STS whose diameter is 8 mm The STS is drilled 90-degree to the laminas and its spacing is 10 cm and 15 cm Two beams are bonded by resin as reference glulam A four-point bending test rig is intended for estimating the flexural behaviour of the 12 beams The deflection load and relative displacement between laminas are recorded and collected simultaneously by data-logging system These data are used to appraise the bending behaviour particularly stiffness of the beams with diverse laminating techniques Besides the testing an analytic verification is carried out based on Eurocode 5 The effective bending stiffness formula contributes to evaluate the EI values of each beam Then the testing results and theoretaicl values are compared to each other The testing results indicate that with the same grade the stiffness can be achieved Both non-glue laminated timber reveals the same trend With the same spacing the hardwood dowel provides higher stiffness than the STS does

Date of Award	2019
Original language	English
Supervisor	Yu-hsiang Yeh (Supervisor)