Abstract
Experimental investigation on the pull-out behaviour, including the withdrawal capacity, slip stiffness and interfacial shear stress, of axially loaded screwed-in threaded rod embedded in cross laminated timber (CLT) was conducted. Specimens with varying embedment length and different number of threaded rods were tested in this study. To prevent premature splitting failure of timber, some specimens were reinforced in the direction perpendicular to the timber grain with self-tapping screws. Test results showed that the screwed-in threaded rod connections exhibited good pull-out behaviour with high withdrawal capacity and slip stiffness. Within a certain range, the withdrawal capacity increases considerably with the increase of embedment length, while the average interfacial shear stress shows the opposite tendency. The self-tapping screws played an important role on reducing the splitting of the timber and improving the withdrawal capacity and slip stiffness of the screwed-in threaded rod. Additionally, for the specimens with self-tapping screw reinforcements, the improvement of withdrawal capacity and stiffness when increasing the number of threaded rods are much more obvious than that of the specimens without the self-tapping screws, due to the change of failure modes.
Highlights
Dowel-type connections are the most common type of connection in timber structures [1]
3.1 Failure Modes At the early loading stage, no visible slip occurred between cross laminated timber (CLT) elements and the screwed-in threaded rods
The pull-out behaviour of axially loaded screwed-in threaded rods embedded in CLT elements, with and without self-tapping screw reinforcements, was studied by experimental study
Summary
Dowel-type connections are the most common type of connection in timber structures [1]. The load-carrying capacity and stiffness of dowel-type connections are limited by the embedment behaviours of wood as well as the bending performance of the fasteners [2,3]. As compared to dowel-type connections, connections with axially-loaded rods (either glued-in rods or screwed-in rods) show remarkable higher withdrawal capacity and stiffness [3,4,5]. Since 1980s, a great deal of research have been performed on glued-in rod connections for timber structures [6,7,8,9,10,11,12,13]. The evaluation on durability behaviour of glued-in rod connections is still inadequate till
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
