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Performance of Timber-Steel Dowel Connections Reinforced with Self-tapping Screws Under Monotonic and Cyclic Loading
The use of mass timber for mid- and high-rise structures has risen dramatically in recent years and is expected to continue to increase given recent changes to the 2020 National Building Code of Canada, which permits mass timber structures up to 12-storeys tall. Critical to the growth of mass timber in Canada is the development of safe and resilient seismic force resisting structural systems (SFRS). One common SFRS used for mass timber structures are braced frames. In mass timber braced frames, the steel connections are relied upon to provide ductility and energy dissipation capacity under earthquake loads. However, the ductility and energy dissipation capacity of steel dowel connections can be limited by the onset of a brittle failure mechanism, (e.g. row shear or group tear-out) prior to significant dowel yielding. To address this challenge, this paper presents experimental results on the structural performance of timber-steel dowelled connections reinforced with self-tapping screws. Twelve connections were tested under monotonic and cyclic loads. The tested connections included two different fastener diameters of 11 and 16 mm, with an internal steel plate, both with and without reinforcing screws designed to prevent brittle shear failure. Experimental results demonstrate that the use of a larger number of smaller fasteners results in higher connection ductility before the onset of brittle row shear failure. Furthermore, results show that reinforcing steel dowel connections with self-tapping screws can significantly increase connection ductility and effectively prevent premature shear failure. Under cyclic loading, tested connections reinforced with self-tapping screws exhibited significant ductility and energy dissipation capacity. Overall, results of this study demonstrate the potential for using self-tapping screws to reinforce steel dowel connections and improve the seismic performance of mass timber braced frames.
Performance of Timber-Steel Dowel Connections Reinforced with Self-tapping Screws Under Monotonic and Cyclic Loading
The use of mass timber for mid- and high-rise structures has risen dramatically in recent years and is expected to continue to increase given recent changes to the 2020 National Building Code of Canada, which permits mass timber structures up to 12-storeys tall. Critical to the growth of mass timber in Canada is the development of safe and resilient seismic force resisting structural systems (SFRS). One common SFRS used for mass timber structures are braced frames. In mass timber braced frames, the steel connections are relied upon to provide ductility and energy dissipation capacity under earthquake loads. However, the ductility and energy dissipation capacity of steel dowel connections can be limited by the onset of a brittle failure mechanism, (e.g. row shear or group tear-out) prior to significant dowel yielding. To address this challenge, this paper presents experimental results on the structural performance of timber-steel dowelled connections reinforced with self-tapping screws. Twelve connections were tested under monotonic and cyclic loads. The tested connections included two different fastener diameters of 11 and 16 mm, with an internal steel plate, both with and without reinforcing screws designed to prevent brittle shear failure. Experimental results demonstrate that the use of a larger number of smaller fasteners results in higher connection ductility before the onset of brittle row shear failure. Furthermore, results show that reinforcing steel dowel connections with self-tapping screws can significantly increase connection ductility and effectively prevent premature shear failure. Under cyclic loading, tested connections reinforced with self-tapping screws exhibited significant ductility and energy dissipation capacity. Overall, results of this study demonstrate the potential for using self-tapping screws to reinforce steel dowel connections and improve the seismic performance of mass timber braced frames.
Performance of Timber-Steel Dowel Connections Reinforced with Self-tapping Screws Under Monotonic and Cyclic Loading
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Breijinck, Thomas (author) / Woods, Joshua (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 21 ; 269-282
2024-01-13
14 pages
Article/Chapter (Book)
Electronic Resource
English
Mass timber , Seismic force resisting structural systems (SFRS) , Timber-steel dowelled connections , Self-tapping screws , Ductility and energy dissipation Engineering , Building Construction and Design , Geoengineering, Foundations, Hydraulics , Transportation Technology and Traffic Engineering , Environment, general
Reinforcement of Dowel-Type Timber Joints with Self-tapping Screws
| Springer Verlag | 2021