Splitting of timber beams loaded perpendicular to grain by connections – Combined effect of edge and end distance

Jensen, Joergen L.; Quenneville, Pierre; Girhammar, Ulf Arne; Källsner, Bo

doi:10.1016/j.conbuildmat.2012.04.006

Cited by 36 publications

(16 citation statements)

References 6 publications

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“…2 The geometric arrangement of the dowel should ensure the prevention of undesirable failure modes, for instance, it should be placed far enough from the edges to avoid cracks. 9 However, besides this possible type of failure, attention should be paid to those described specifically for dowel-type joints in Eurocode 5 2 : crushing of the external pieces of timber (failure mode 1), crushing of the central piece of timber (failure mode 2), plastic deformation of a dowel with a hinge in its centre (failure mode 3) and plastic deformation of a dowel with three hinges, one in its centre and two in the external pieces of timber (failure mode 4).…”

Section: Description Of the Case Studymentioning

confidence: 99%

“…Simple analytical models based on fracture mechanics have been studied by other authors. 9 The shear modulus in the embedding planes has specific qualities, since it varies depending on the position of the fibres due to the variable stresses which occur in a crushing process that also varies the geometry of the embedded material. The following bases have been taken to accurately adapt equation (8) to the study of embedding of the threaded dowel in the direction perpendicular to its axis:…”

Section: Calculation Model Based On the Evolution Of The Slipmentioning

confidence: 99%

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Accounting of the thread embedment in timber structures dowel-type joints. Load–slip relationship

Domínguez

Fueyo

Cabezas

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work is devoted to the development of a calculation proposal for dowel-type joints in timber structures that takes into account the increase in load capacity due to the use of threaded dowels. While the method is based on acknowledged criteria of structural standards, it also considers the crushed areas that appear in the timber near the zone of contact with the dowel's thread. Thereby, it comes closer to the actual mechanical behaviour of the whole joint when it suffers a relative displacement between its different parts under an external load. The equations proposed in this study to define the load capacity of the joint take into account the rope effect produced by the axial forces arising on the dowel due to the combined effect of bending of the dowel and compression of the timber fibres embedded in its thread. A comparison of the results of the new analytical method proposed with those of a battery of experimental tests is shown.

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Section: Description Of the Case Studymentioning

confidence: 99%

Section: Calculation Model Based On the Evolution Of The Slipmentioning

confidence: 99%

Accounting of the thread embedment in timber structures dowel-type joints. Load–slip relationship

Domínguez

Fueyo

Cabezas

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In Jensen et al [41], the perpendicular-to-grain tensile strength of Radiata Pine LVL was determined by testing on 45 × 70 × 240 mm 3 volumes. The mean value was found to be 1.5 MPa.…”

Section: Appendixmentioning

confidence: 99%

“…The first author has personally tested numerous beams and so-called plate specimens (see Jensen et al [41]; Jensen and Gustafsson [42]) with bolts loading timber perpendicular to the grain and causing splitting. Knots always serve as reinforcement in such splitting problems.…”

Section: Appendixmentioning

confidence: 99%

Fracture Mechanics Models for Brittle Failure of Bottom Rails due to Uplift in Timber Frame Shear Walls

Jensen

Caprolu

Girhammar

2016

Advances in Civil Engineering

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In partially anchored timber frame shear walls, hold-down devices are not provided; hence the uplift forces are transferred by the fasteners of the sheathing-to-framing joints into the bottom rail and via anchor bolts from the bottom rail into the foundation. Since the force in the anchor bolts and the sheathing-to-framing joints do not act in the same vertical plane, the bottom rail is subjected to tensile stresses perpendicular to the grain and splitting of the bottom rail may occur. This paper presents simple analytical models based on fracture mechanics for the analysis of such bottom rails. An existing model is reviewed and several alternative models are derived and compared qualitatively and with experimental data. It is concluded that several of the fracture mechanics models lead to failure load predictions which seem in sufficiently good agreement with the experimental results to justify their application in practical design.

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“…Dorn et al 2013) and perpendicular (see e.g. Schoenmakers and Jorissen 2011;Jensen et al 2012) to the grain.…”

Section: Introductionmentioning

confidence: 99%

Dowel deformations in multi-dowel LVL-connections under moment loading

Bader

Schweigler

Hochreiner

et al. 2015

Wood Material Science & Engineering

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The aim of the experimental study presented herein is the assessment and quantification of the behavior of individual dowels in multi-dowel connections loaded by a bending moment. For this purpose, doubleshear, steel-to-timber connections with nine steel dowels arranged in different patterns and with different dowel diameters were tested in 4-point bending. In order to achieve a ductile behavior with up to 7° relative rotation, the connections were partly reinforced with self-tapping screws. The reinforcement did not influence the global load-deformation behavior, neither for dowel diameters of 12 mm nor for 20 mm, as long as cracking was not decisive. The deformation of the individual dowels was studied by means of a non-contact deformation measurement system. Thus, the crushing deformation, i.e. the deformation at the steel plate, and the bending deformation of the dowels could be quantified. In case of 12 mm dowels, the bending deformation was larger than the crushing deformation, while it was smaller in case of 20 mm dowels. Moreover, dowels loaded parallel to the grain showed larger bending deformations than dowels loaded perpendicular to the grain. This indicates that the loading of the individual dowels in the connection differs, depending on their location.

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Splitting of timber beams loaded perpendicular to grain by connections – Combined effect of edge and end distance

Cited by 36 publications

References 6 publications

Accounting of the thread embedment in timber structures dowel-type joints. Load–slip relationship

Accounting of the thread embedment in timber structures dowel-type joints. Load–slip relationship

Fracture Mechanics Models for Brittle Failure of Bottom Rails due to Uplift in Timber Frame Shear Walls

Dowel deformations in multi-dowel LVL-connections under moment loading

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