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An experimental and numerical study of the effect of friction in single dowel joints

Experimentelle und rechnerische Untersuchung des Einflusses von Reibung in Verbindungen mit einem Stabdübel

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Abstract

The effect of friction between the dowel and the surrounding timber was studied for single dowel-type joints. The joints tested were divided into two groups of joints, where the surface of the dowels differed. For the first group, the dowels had a smooth surface and for the second group the dowels had a rough surface. A contact-free measurement technique was used in the experimental investigation. In addition to that, numerical simulations were carried out aimed at predicting the load-bearing capacity of the joints tested as well as estimating the coefficient of friction between the dowel and the surrounding timber.

Important conclusions from this study, which are supported by previous research, are that the load-bearing capacity of single dowel-type joints increases when the surface roughness of the dowel increases. A very small scatter in the results, in terms of the load-displacement behavior, was seen in the tests with rough surface dowels. For the joints with smooth surface dowels, the elastic response as well as the plastic response varied considerably between different tests. The current version of the European timber code EC5 does not explicitly take into account the effect of friction. In order to take the effect into account embedding tests have to be performed in order to be able to consider the benefits of using dowels with rough surface.

Zusammenfassung

Untersucht wurde der Einfluss der Reibung zwischen dem Dübel und dem umgebenden Holz. Zwei verschiedene Verbindungen mit jeweils unterschiedlicher Dübeloberfläche wurden untersucht. In einer Verbindung wurden Dübel mit einer glatten Oberfläche und in der zweiten Verbindung Dübel mit einer rauen Oberfläche verwendet. In der experimentellen Untersuchung wurde ein berührungsloses Messverfahren eingesetzt. Zusätzlich wurden Simulationsrechnungen zur Berechnung der Tragfähigkeit der Verbindungen sowie der Schätzung des Reibungskoeffizienten zwischen Dübel und umgebendem Holz durchgeführt.

Als wichtigstes Ergebnis zeigte sich in Übereinstimmung mit früheren Untersuchungen, dass die Tragfähigkeit einer Stabdübelverbindung mit zunehmender Oberflächenrauhigkeit des Dübels zunimmt. Bei den Versuchen mit rauer Dübeloberfläche wiesen die Kraft-Weg-Diagramme nur eine geringe Streuung auf. Das elastische und plastische Verhalten der Verbindungen mit glatter Dübeloberfläche streute dagegen zwischen den verschiedenen Versuchen beachtlich. In der aktuellen Fassung des Eurocode 5 wird der Einfluss der Reibung nicht explizit berechnet. Um diesen Einfluss zu berücksichtigen, müssen Versuche zur Lochleibungsfestigkeit durchgeführt werden, um den Vorteil der Verwendung von Dübeln mit rauer Oberfläche nutzen zu können.

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Correspondence to Johan Sjödin.

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Sjödin, J., Serrano, E. & Enquist, B. An experimental and numerical study of the effect of friction in single dowel joints . Holz Roh Werkst 66, 363–372 (2008). https://doi.org/10.1007/s00107-008-0267-z

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