Abstract
Restoring ancient timber structures often involves cutting or reinforcing stop-splayed scarf-joints in beams or truss-rods. Steel nails, bolts and plates or adhesive resins and rods are commonly used, however these jointing technologies cause some disadvantages, such as moisture between steel and timber surfaces, hard reversibility of the intervention and a questionable aesthetic output in uncovered structures. The employment of timber pegs, inserted perpendicular to the grain, could be an efficient solution and is already preferred in some applications. Since no design rules for traditional timber joints or for timber pegged connections are given by European codes, investigations on scarf joint behaviour before and after reinforcement are needed aiming to reliable design procedures. In this study, the role of the fastener inside this tension resisting carpentry joint and its contribution in yield strength and stiffness have been investigated. Specific attention has been addressed to stiffness, which is positively influenced by the insertion of timber pegs. Three samples of fir scarf-joints have been tested, a total of eight specimens, with different configurations: without fasteners, with timber pegs and with steel pins. The different failure modes under tension load of the samples and their rheological behaviour have been studied and compared to trace force distribution between the resisting elements, that is the ash key and the added fasteners.
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References
Branco JM, Descamps T (2015) Analysis and strengthening of carpentry joints. Constr Buil Mat 97:34–47. https://doi.org/10.1016/j.conbuildmat.2015.05.089
Parisi MA, Piazza M (2000) Mechanics of plain and retrofitted traditional timber connections. J Struct Eng 126(12):1395–1403
Branco JM, Piazza M, Cruz PJS (2011) Experimental evaluation of different strengthening techniques of traditional timber connections. Eng Struct 33:2259–2270. https://doi.org/10.1016/j.engstruct.2011.04.002
Aman R, West H, Cormier D (2008) An evaluation of loose tenon joint strength. For Prod J 58(3):61–64
Judd J, Fonseca F, Walker C, Thorley P (2012) Tensile strength of varied-angle mortise and tenon connections in timber frames. J Struct Eng 137(5):636–644
Likos E, Haviarova E, Eckelman C, Erdil Y, Ozcifci A (2012) Effect of tenon geometry, grain orientation, and shoulder on bending moment capacity and moment rotation characteristics of mortise and tenon joints. Wood Fiber Sci 44(4):1–8
Dorn M, De Borst K, Eberhardsteiner J (2013) Experiments on dowel-type timber connections. Eng Struct 47:67–80. https://doi.org/10.1016/j.engstruct.2012.09.010
Xu BH, Taazount M, Bouchaïr A, Racher P (2009) Numerical 3D finite element modelling and experimental tests for dowel-type timber joints. Constr Build Mater 23:3043–3052. https://doi.org/10.1016/j.conbuildmat.2009.04.006
Sangree RH, Schafer BW (2009) Experimental and numerical analysis of a stop-splayed traditional timber scarf joint with key. Constr Build Mater 23:376–385. https://doi.org/10.1016/j.conbuildmat.2007.11.004
Aira JR, Arriaga F, Gonzalez GI et al (2015) Failure modes in halved and tabled tenoned timber scarf joint by tension test. Constr Build Mater 96:360–367. https://doi.org/10.1016/j.conbuildmat.2015.08.107
Fajman P, Maca J (2017) Stiffness of scarf joint with dowels. Comp Struct Press. https://doi.org/10.1016/j.compstruc.2017.03.005
Fajman P (2014) A scarf joint for reconstructions of historical structures. Adv Mat Res 969:9–15. https://doi.org/10.4028/www.scientific.net/AMR.969
Hirst E, Brett A, Thomson A et al (2008) The structural performance of traditional oak tension & scarf joints. In: 10th world conference on timber engineering (WCTE), 2008-06-02–2008-06-05. Miyazaki, Japan
Ceraldi C, D’Ambra C, Lippiello M, Prota A (2017) Restoring of timber structures: connections with timber pegs. Eur J Wood Wood Prod 75(6):957–971
Ceraldi C, D’Ambra C, Lippiello M, Prota A (2017) The influence of Dowel-bearing strength in designing timber pegged timber joints. Int J Arch Herit 1–14. https://doi.org/10.1080/15583058.2017.1323249
ASTM D 5764 – 97a: Standard test method for evaluating Dowel-bearing strength of wood and wood-based products. ASTM International
UNI EN 1995-1-1. 2004. Eurocodice 5: progettazione delle strutture di legno – Regole generali e regole per gliedifici
Acknowledgments
The Authors would like to thank the laboratory staff of DiSt of University of Naples, Mr. Mario Torricella and Mr. Domenico Imperatrice, for the valuable support provided during experimental tests.
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Ceraldi, C., Costa, A., Lippiello, M. (2019). Stop-Splayed Scarf-Joint Reinforcement with Timber Pegs Behaviour. In: Aguilar, R., Torrealva, D., Moreira, S., Pando, M.A., Ramos, L.F. (eds) Structural Analysis of Historical Constructions. RILEM Bookseries, vol 18. Springer, Cham. https://doi.org/10.1007/978-3-319-99441-3_38
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DOI: https://doi.org/10.1007/978-3-319-99441-3_38
Publisher Name: Springer, Cham
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