Acta Univ. Agric. Silvic. Mendelianae Brun. 2015, 63(4), 1153-1159 | DOI: 10.11118/actaun201563041153

Mechanical Performance and Contact Zone of Timber Joint With Oblique Faces

Jiří Kunecký1,2, Václav Sebera1, Jan Tippner1, Hana Hasníková2, Michal Kloiber2, Anna Arciszewska-Kędzior2, Jaromír Milch1
1 Department of Wood Science, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
2 The Institute of Theoretical and Applied Mechanics AS CR, v. v. I., Prosecká 809/76, 190 00 Praha, Czech Republic

The goal of the work was to evaluate mechanical performance of full-scale timber beams containing scarf joint with a dowel. Work focused on standard testing using modular system to obtain effective stiffness and strength of the beams with and without the joint. The work further researched a contact zone between two timber parts of the joint - at the scarf face. This was carried out using non-destructive optical technique - digital image correlation (DIC) and newly developed algorithm. The joint was made of Norway spruce, dims. 6×0.2×0.24 m and was loaded by two modes: a) 3-point bending and b) 4-point bending. During the loading, a sequence of images was acquired for further investigation of contact zone using the proposed algorithm. The joint with scarf and dowel provided enough effective stiffness, ie. 73-93% for 3-point bending test and 71% for 4-point bending with respect to MOE measured on reference solid beams. Effective strength of the joint was also relatively high and in a range of 55% and 60% with respect to reference solid beams in both 3-point and 4-point bending tests. Contact length differed for loading modes. Mean contact length in symmetrical 4-point bending was about 40%, for asymmetrical 3-point bending test, it was approx. 20% on face closer to support and 44% on a face closer to loads.

Keywords: timber joint, contact zone, bending, digital image correlation, non-destructive testing, dowel
Grants and funding:

The authors thank to project NAKI DF12P01OVV004 provided by the Ministry of Culture of the Czech Republic.

Prepublished online: September 2, 2015; Published: September 1, 2015  Show citation

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Kunecký, J., Sebera, V., Tippner, J., Hasníková, H., Kloiber, M., Arciszewska-Kędzior, A., & Milch, J. (2015). Mechanical Performance and Contact Zone of Timber Joint With Oblique Faces. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(4), 1153-1159. doi: 10.11118/actaun201563041153
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