Abstract
At present, the mechanical properties of laterally loaded threaded fasteners with large diameters embedded in timber elements remain unknown. An experimental study of laterally loaded threaded rods with wood screw threads embedded perpendicular to grain in softwood elements (spruce and pine glulam and spruce LVL) is presented in this paper. Embedment tests with the load acting parallel and perpendicular to grain were carried out and the embedment strength and stiffness were quantified. For some test series, the experimental embedment strengths were lower compared to the predictions according to Eurocode 5 in terms of both mean and characteristic values. This finding indicates that the predictions by Eurocode 5 are not always conservative. To investigate the effect of the thread, additional series of embedment tests were carried out with smooth dowels featuring a diameter approximately equal to the core diameter of the threaded rods. Finally, the yielding moment of threaded rods was quantified based on a series of three-point bending tests of threaded rods. The experimentally determined yielding moment was significantly higher than the prediction of Eurocode 5.
Highlights
Steel threaded rods with wood screw threads feature high axial capacity and stiffness, and they are a promising alternative to dowel-type fasteners for highly resistant and stiff connections in timber structures
This paper presents an experimental study on the mechanical properties of laterally loaded threaded rods with outerthread diameter d = 22 mm and core diameter d1 = 16.1 mm, embedded perpendicular to grain in softwood elements
The yielding moments were determined by use of the 5%-offset as specified by ISO10984-1:2009 (ISO 2009a); see Fig. 9
Summary
Steel threaded rods with wood screw threads feature high axial capacity and stiffness, and they are a promising alternative to dowel-type fasteners (i.e. fasteners loaded perpendicular to their axis) for highly resistant and stiff connections in timber structures. Due to their axial properties, the design of connections with threaded rods should aim for axial loading of the rods. The axial properties of threaded rods have been investigated in a series of studies (see e.g. Blaß and Krüger 2010; Mori et al 2008; Stamatopoulos and Malo 2016, 2015, 2020).
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