Block shear failure mechanism of axially-loaded groups of screws

Mahlknecht, Ursula; Brandner, Reinhard

doi:10.1016/j.engstruct.2018.12.057

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Therefore, it was confirmed that the shear resistance to later load appeared low in case of block tear-out failure occurred mainly. There were some reports that the block tear-out failure occurred at wood causing decrease of joint properties (Jensen et al 2012;Stapf et al 2012;Zarnani and Quenneville 2014;Mahlknecht and Brandner 2019). Additionally, it was reported that block tear-out failure occurred more easily in stiff materials (Miyoshi et al 2018).…”

Section: Resultsmentioning

confidence: 99%

Shear resistance for lateral force of light-frame wall sheathed with structural particleboard (PB)

Kim,

Lee,

Lee

et al. 2024

BioRes

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The shear resistance of a structural particleboard (PB) wall was evaluated as a means to utilize recycled wood and low-grade logs for long periods. The wall was composed of spruce-pine-fir (SPF) lumber, nails, and structural PB, which was developed by improving the water resistance of default PB. Structural PB has a higher density than OSB, which is a commonly used covering material for light wooden structural walls, so a longer end distance for nailing at edge of sheathing is needed for structural PB. In this study, it was confirmed that structural PB walls sufficiently resisted lateral load when the end distance was 15 mm. In this case, the shear strength, shear modulus, and ductility of the structural PB wall for lateral cyclic load were confirmed as 9.2 kN/m, 2.0 kN/mm, and 6.2, respectively. When compared to the design value, the shear strength value was higher than that of the OSB wall and the plywood wall. The shear modulus was lower than that of OSB walls, but higher than plywood walls. Based on the above results, it was considered that structural PB light-frame wall could be used in residential load-bearing applications.

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Section: Resultsmentioning

confidence: 99%

Shear resistance for lateral force of light-frame wall sheathed with structural particleboard (PB)

Kim,

Lee,

Lee

et al. 2024

BioRes

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“…Examples are available in [2][3][4][5]. Recent works confirmed that particular attention must be paid to the design of spacing and edge distance to avoid anticipated brittle failures in the timber element, either for solid wood or laminated timber products (e.g., block shear failure, tension orthogonal to the grain) [6]. The ongoing revision of Eurocode 5 [7], based on detailed works recently published in the literature, aims to provide a design toolbox for the practitioners, which helps them in dealing with the design of modern fasteners with different anchoring materials [8].…”

Section: Introduction 123mentioning

confidence: 99%

Strength Characterization of Overlapped Timber Screws

Marchi

Trutalli

Pozza

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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The possibility of transmission of axial forces between self-tapping screws fastened in the opposite faces of a timber element and loaded contrariwise is analysed. The screws are intended to be placed sufficiently close one to another and the threaded shanks overlapped by a suitable length. Experimental tests are conducted, varying type, penetration depth and overlapping length of the screws, to evaluate the actual strength and the type of failure of this fastening technique.

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“…Finite element analysis was performed to study the wood screw interaction and to describe the load deformation characteristic of screws under tension and compression loads (Serrano 2001;Danzer et al 2016;Naderer et al 2016) or to consider group effects, as performed by Mahlknecht et al (2016). The bond behaviour of the model was considered to be homogeneous along the screws shaft together with a simplified load slip behaviour derived from the load-deformation relationship of the screw.…”

Section: Introductionmentioning

confidence: 99%

Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws

2021

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The pull-out resistance of fully threaded, self-tapping screws under axial loading has been investigated intensively in the past. Actual design models are based mainly on empirical data because the detailed interaction between the screw thread and the surrounding timber member remains unclear and might depend on the test set-up. An innovative screw sensor with 19 internal fibre Bragg gratings (FBGs) was developed to measure the forces along the screw axis. The screw diameter was 12 mm and the maximum embedding length was 360 mm. The FBG measurement screw was applied in pull-out tests under different support conditions. The results carried out show details of the axial forces along fully threaded screws depending on the magnitude of the screw axis to grain angle, the embedding length, the material and the support conditions. Load transfer between the screw and the surrounding timber was determined by means of the change of axial forces along the screw axis. A comparison of the experimental results with Volkersen’s theory points out the decisive dependency of the support conditions on the axial forces in fully threaded self-tapping screws. Additionally, the experimental test results show indications of shear and compressive stresses in the interface of the measurement screw.

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Block shear failure mechanism of axially-loaded groups of screws

Cited by 8 publications

References 18 publications

Shear resistance for lateral force of light-frame wall sheathed with structural particleboard (PB)

Shear resistance for lateral force of light-frame wall sheathed with structural particleboard (PB)

Strength Characterization of Overlapped Timber Screws

Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws

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