Performance of self-tapping screw in mass timber subjected to moisture content change

This research addresses the issue of self-tapping screw (STS) failures resulting from the swelling of mass timber
products during the installation process or service. STS is a common type of fastener used for connecting timber
members. Since mass timber products are relatively new, there is a lack of specific design guidelines for STS in
the Canadian timber design standard, especially concerning moisture content changes. The objective of this
project is to comprehend and evaluate the force generated in the screw by wood swelling and the influence of
torque on the performance of STS under varying moisture conditions. The results will provide valuable data to our
industry partner for enhancing safety of mass timber structures. Furthermore, our research will make a significant
contribution to the wood construction sector, potentially influencing future revisions of the Canadian timber design
standard. Finally, the results of this project will help to enhance the overall performance of STS employed in mass
timber structures.

Faculty Supervisor:

Zengtao Chen;Ying-Hei Chui

Student:

Partner:

Rothoblaas

Discipline:

Engineering

Sector:

Wholesale trade

University:

University of Alberta

Program: