Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Strain Distribution of Dowel-Type Connections Reinforced with Self-Tapping Screws
Current limited guidance on the selection of screws together with undefined design specifications restricts the effectiveness of self-tapping screws as reinforcement on timber members to control crack propagation. Using digital image correlation (DIC), this study visualized the surface strain distribution of screw-reinforced dowel-type connections to understand the influence of thread configuration and screw-to-dowel distance on controlling crack propagation. The experiment was based on single-dowel embedment tests using 16- and 20-mm-diameter steel dowels. Three thread lengths (0%, 33%, and 100% thread) and six screw-to-dowel distances (, , , , , and ) were investigated. Results show that a screw with 33% thread on the point end can be as effective as screws with 100% thread to control crack propagation under the same geometrical parameters of the connections. Results also reveal that a screw placed further from the dowel (e.g., at distance) can delay the crack-controlling effect. Self-tapping screws placed at can still improve the embedment strength and ductility; however, further doubling this distance () did not enhance the embedment strength, but a higher ductility was still achieved.
Strain Distribution of Dowel-Type Connections Reinforced with Self-Tapping Screws
Current limited guidance on the selection of screws together with undefined design specifications restricts the effectiveness of self-tapping screws as reinforcement on timber members to control crack propagation. Using digital image correlation (DIC), this study visualized the surface strain distribution of screw-reinforced dowel-type connections to understand the influence of thread configuration and screw-to-dowel distance on controlling crack propagation. The experiment was based on single-dowel embedment tests using 16- and 20-mm-diameter steel dowels. Three thread lengths (0%, 33%, and 100% thread) and six screw-to-dowel distances (, , , , , and ) were investigated. Results show that a screw with 33% thread on the point end can be as effective as screws with 100% thread to control crack propagation under the same geometrical parameters of the connections. Results also reveal that a screw placed further from the dowel (e.g., at distance) can delay the crack-controlling effect. Self-tapping screws placed at can still improve the embedment strength and ductility; however, further doubling this distance () did not enhance the embedment strength, but a higher ductility was still achieved.
Strain Distribution of Dowel-Type Connections Reinforced with Self-Tapping Screws
Zhang, Cong (Autor:in) / Harris, Richard (Autor:in) / Chang, Wen-Shao (Autor:in)
23.10.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Reinforcement of Dowel-Type Timber Joints with Self-tapping Screws
| Springer Verlag | 2021