Fully Threaded Self-tapping Screws Subjected to Combined Axial and Lateral Loading with Different Load to Grain Angles

Jockwer, Robert; Steiger, René; Frangi, Andréa

doi:10.1007/978-94-007-7811-5_25

Cited by 20 publications

(24 citation statements)

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“…First of all, the influence of the screwing angle was studied with FE models. A comparison with experimental results Tangential and radial rigidities 0 N=mm coming from the literature is proposed (Jockwer et al 2014). Figure 3 presents the FE model inspired by Jockwer's tests.…”

Section: Resultsmentioning

confidence: 99%

Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

et al. 2016

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Since the 80's, Johanssen's Yield Theory has been adapted to fit new design practices: fastening of timber elements with a layer of insulation (or gap) between the elements or fastening with inclined fasteners. However no rules exist for connections with large gaps (up to 500 mm) and inclined fasteners. The behaviour of screwed connections (timber/large gap/timber) is modelled using an orthotropic material, cohesive surface, Hill criterion and a fictitious material that wraps the screw and models a complex medium where steel and wood interact. The calibrated FE model is finally compared to experimental results.

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Section: Resultsmentioning

confidence: 99%

Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

et al. 2016

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“…Therefore, in the present work, the effects of rod-to-grain and load-to-rod angles on capacity and stiffness of long threaded rods are investigated by use of experiments and numerical models. An assessment of the applicability of the capacity prediction by Eurocode 5 (CEN 2004), and by the model proposed by Jockwer et al (2014) for self-tapping screws, is carried out on basis of the experimental results. An analytical model for predicting the stiffness of threaded rods is proposed, accounting for different boundary conditions at the rod-ends.…”

Section: Fig 1 Prototype Timber Joints By Use Of Long Threaded Rodsmentioning

confidence: 99%

“…Several studies were conducted for timber-to-timber joints with inclined self-tapping screws, see e.g. (Bejtka and Blaß 2002;Tomasi et al 2010;Jockwer et al 2014). In addition, few design guidelines generally valid for screws are given by Eurocode 5 (CEN 2004).…”

Section: Introductionmentioning

confidence: 99%

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Effect of rod-to-grain angle on capacity and stiffness of axially and laterally loaded long threaded rods in timber joints

2018

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Long threaded rods have recently been widely used as a reinforcement of glued laminated timber in perpendicular to the grain direction. The recent research has thus focused mainly on the withdrawal properties of the threaded rods in the axial direction. Utilizing their large withdrawal stiffness and strength, the threaded rods can also effectively be used as connectors in moment resisting timber joints. Yet, in joints, the threaded rods are often imposed to a non-axial loading, due to inclination of the rod axis to the grain as well as loading direction different from the rod axis. No design models are currently available for the combined axial and lateral loading of the threaded rods. In the present work, the effects of the rod-to-grain and load-to-rod angles on capacity and stiffness of the threaded rods are investigated by use of experiments and finite element models. Based on those, analytical expressions for determining stiffness and capacity of axially and laterally loaded threaded rods are proposed, intended as a basis for practical joint design. Furthermore, effect of various boundary conditions applied at the rod-ends is studied.

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“…In Chile, Opazo and Bustos [8] confirmed applicability of Bejtka and Blass model [3] to the inclined STS tensile single shear joints made of Chile-grown radiate pine. After these pioneering researches, a lot of researches for making sure the maximum load carrying capacity [2,[9][10][11][12][13][14][15][16][17] as well as stiffness [12][13][14][15][16][17] of inclined STS wood-to-wood shear joint as well as steel-towood joint [9,11] have been carried out until today.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analyses on nonlinear behaviour of wooden parallel chord trusses composed of self-tapping screws

Komatsu

Teng

et al. 2018

J Wood Sci

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Five different wooden parallel chord trusses were made of Canadian spruce 2 by 4 lumbers. Chord-web nodal points were composed of self-tapping-screws (STS) whose numbers per nodal point and allocations in nodal point were considered as the main experimental parameters which were varied from 2rows-2lines till 2rows-4lines. Load-slip relationships at nodal point were evaluated using the joint specimens made of similar materials. These parallel chord trusses were modeled using a finite element method (FEM) program by taking not only nonlinearity of nodal point joints but also material nonlinearity of chord members using fiber model into consideration. Strength properties of the chord members were deduced via specific gravity of chord member based on the regression equations given by a literature. Static monotonic central point loading tests were conducted on five specimens to investigate nonlinear behaviors of wooden parallel chord trusses. Comparisons between observed results by experiments and computed ones by FEM calculations showed a tendency that material nonlinearity gave less effect on the total nonlinear behaviour of the specimens when joint performance was inferior, on the other hand, as the joint performance increased material nonlinearity gave dominant effect on the total nonlinear behaviour of the specimens.

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Fully Threaded Self-tapping Screws Subjected to Combined Axial and Lateral Loading with Different Load to Grain Angles

Cited by 20 publications

References 1 publication

Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

Effect of rod-to-grain angle on capacity and stiffness of axially and laterally loaded long threaded rods in timber joints

Experimental and numerical analyses on nonlinear behaviour of wooden parallel chord trusses composed of self-tapping screws

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