Strength of t-joints in wooden constructions


1Department of Wood Industry, Faculty of Forestry Sciences, Agricultural University of Tirana, 1029 Tirana

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This paper is focused on the determination of mechanical properties and loading capacity for T-joints used in wooden construction. The results can be adapted both in the furniture construction and in the large wooden structure construction. A console like model is used in case of massive wooden furniture structures, MDF or particle board furniture’s, dovetail or dowel joints to test the resistance of the connection. Because of the large size of structural elements, only few durability tests of T-joints in larger wooden structures have been performed using real-size samples. However, the obtained test results can easily be homologated. In our experiment the connection of wooden structural elements is realized by means of a metallic bolt with two nuts and two washers. In order to achieve a good shape of the hole the drilling on wood is made by a well sharpened drilling bit. The structural elements tested are made from Abies Alba mill wood, with a density of 0.35 g/cm³, and a humidity of 12%. The samples are tested in a Controlab testing device. The force is applied at regular intervals and the displacement of the samples during testing was measured by means of a LVDT. The performance graphs obtained from the tests show a scaled curve performance of the structural elements tested. The various maximum values achieved are explained by the anisotropy of wood and the presence of defects such as joints, which are inevitable. Wood anisotropy also explains the different times needed for the destruction of thesamples.

Keywords: Wood, bolt, strength, mechanical, tests

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