Analytical modelling of cold-formed steel-to-timber connections with inclined screws
Author(s)
Vella, Nathan
Gardner, Leroy
Buhagiar, Spiridione
Type
Journal Article
Abstract
An analytical model that can describe the load-slip response of cold-formed steel-to-timber
connections, based on three components: timber embedment, screw bending and the axial pullthrough, is presented. The model takes into consideration the screw inclination and the damage
to the timber caused during the screw drilling process. The model was validated against
available push-out test results, where it was shown that the model can accurately describe the
ultimate load, the slip at ultimate load, and the two slip moduli, ks and ks,m, with mean modelto-test ratios of 1.01, 1.03, 1.09 and 0.96, respectively. The observed failure modes were also
accurately predicted. Comparisons between the test data and the predictions of the EN 1995-1-
1 design expressions showed that the Eurocode underestimated the ultimate loads by around
50% on average and overestimated the slip moduli by around 500% on average; the proposed
model therefore offers a significant improvement over current design provisions.
connections, based on three components: timber embedment, screw bending and the axial pullthrough, is presented. The model takes into consideration the screw inclination and the damage
to the timber caused during the screw drilling process. The model was validated against
available push-out test results, where it was shown that the model can accurately describe the
ultimate load, the slip at ultimate load, and the two slip moduli, ks and ks,m, with mean modelto-test ratios of 1.01, 1.03, 1.09 and 0.96, respectively. The observed failure modes were also
accurately predicted. Comparisons between the test data and the predictions of the EN 1995-1-
1 design expressions showed that the Eurocode underestimated the ultimate loads by around
50% on average and overestimated the slip moduli by around 500% on average; the proposed
model therefore offers a significant improvement over current design provisions.
Date Issued
2021-12-15
Date Acceptance
2021-09-08
Citation
Engineering Structures, 2021, 249, pp.1-18
ISSN
0141-0296
Publisher
Elsevier
Start Page
1
End Page
18
Journal / Book Title
Engineering Structures
Volume
249
Copyright Statement
© 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0141029621013158?via%3Dihub
Subjects
Science & Technology
Technology
Engineering, Civil
Engineering
Analytical model
Inclined screws
Cold-formed steel
Timber particle board
Plywood
Wing tip self-drilling screw
Push-out force
Load-slip relationship
BEHAVIOR
0905 Civil Engineering
0912 Materials Engineering
0915 Interdisciplinary Engineering
Civil Engineering
Publication Status
Published
Date Publish Online
2021-10-09