Abstract
Our study focuses on predicting the ultimate short-term load carrying capacity of timber-to-timber connections with dowel-type fasteners. The wide range of possible configurations in practice makes the resolution of these values by tests unrealistic. Moreover, different current regulations do not consider some specific failure mechanisms. In many countries, the reduction of resistance involved by this phenomenon is taken into account by considering an effective number of dowels (nef) smaller than the actual number of dowels (n) in the connection. However, these different regulations disagree on the values of nef and on other points (spacing, partial coefficient of security, formulas). These discrepancies in design rules invite the fundamental research on this topic and, therefore, new methods are sought in order to estimate the load carrying capacities of the connections. In the light of these, our approach consists of predicting the load carrying capacity with the neural network numerical tool. The results obtained by this analysis tool are satisfactory, although the model remains complex. Subsequently, we focus on the simplification of this numerical model with classical regression techniques in order to implement it in a design code.
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Appendix
Appendix
1.1 Notation
The following symbols are used in this paper
- a 1 :
-
Spacing between dowels in a row
- a 2 :
-
Spacing between dowel rows
- a 3 :
-
End distance spacing
- a 4 :
-
Edge distance spacing
- d :
-
Dowel diameter
- f h :
-
Embedment strength of the wood
- f u :
-
Characteristic tensile strength of the metallic dowel
- m :
-
Number of rows
- n :
-
Number of dowels in a row
- n ef :
-
Effective number of dowels
- t 1 :
-
Lateral thickness of wood members
- t 2 :
-
Median thickness of wood member
- α:
-
Angle between the loading and the grain directions
- ρ:
-
Mean density of wood
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Cointe, A., Rouger, F. Improving the evaluation of multiple-dowel-type connection strength. Wood Sci Technol 39, 259–268 (2005). https://doi.org/10.1007/s00226-005-0293-5
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DOI: https://doi.org/10.1007/s00226-005-0293-5