Embedment of Metal Washers into Timber Members of Bolted Timber Joints I.

Matsubara, Doppo; Shimada, Masahiro; Hirai, Takao; Funada, Ryo; Hattori, Nobuaki

doi:10.2488/jwrs.62.119

Cited by 4 publications

(8 citation statements)

References 1 publication

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“…As observed by Matsubara et al [11], two types of deformation modes in the experiment were observed: the metal washer around the bolt hole partially bending and being embedded into the wood, and the entire metal washer being embedded into the wood. The former was observed in the washer with small thickness and long side length, i.e., low bending stiffness.…”

Section: Resultssupporting

confidence: 67%

“…The embedment behavior of the metal washers into wood was investigated by Matsubara et al [11] through embedment tests. This section provides an overview of the experiment, which is described in detail in their paper.…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…Fig. 2 Finite-element model of metal washer with a thickness of 2.3 mm and a side length of 40 mm (L: longitudinal, T: tangential, R: radial) in the radial direction were obtained from the compressive test performed by Matsubara et al [11]. The Young's moduli in the other two directions and the shear moduli were calculated from E R using the following relationships for coniferous forests [19]:…”

Section: Numerical Conditionsmentioning

confidence: 99%

“…Thus, the embedment mechanism plays a significant role in designing bolted joints. The theory of beams on elastic foundation was applied to the embedment of metal washers into wood; the proposed method could estimate embedment stiffness and yield resistance [11]. Three-dimensional finite-element analysis (FEA) of embedment has been performed, and good agreement was qualitatively obtained between the embedment load-displacement curves obtained via FEA and an embedment test [12].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints

et al. 2021

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The pretensioning force in bolted joints enhances the lateral strength of the connections, and causes the embedment of metal washers into wood. Despite the significance of embedment behavior in the design of bolted joints, its mechanism has yet to be fully understood. In this study, the mechanism of the embedment of a metal washer into wood along the radial direction was examined through three-dimensional nonlinear finite-element analysis (FEA). The FEA results were validated by comparing them with experimental results for nine metal washers with different geometries. Moreover, the sensitivity of embedment stiffness and yield load to wooden material constants was also investigated. The numerical results showed good qualitative and quantitative agreement with the experimental results. In addition, the embedment stiffness and yield load were sensitive to the yield stress and Young’s modulus of wood in the radial and tangential directions. The determination of these mechanical properties of wood through material testing is important for reproducing the behavior of the embedment of a metal washer into wood and accurately estimating the yield load and initial stiffness using FEA. This will play a significant role in designing bolted joints.

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Section: Resultssupporting

confidence: 67%

Section: Experimental Conditionsmentioning

confidence: 99%

Section: Numerical Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints

et al. 2021

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“…Although there is a rather large dispersion, maximum tightening angle tends to decrease with increasing initial elasticity gradient. Where embedment traces of round washer on attaching member were confirmed visually in all specimens, this finding can be attributed to the washer exhibiting higher embedment stiffness at smaller diameter-thickness ratios [12].…”

Section: Resultsmentioning

confidence: 58%

Relationship between clamp force and pull-out strength in lag screw timber joints

et al. 2017

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This study empirically examines the relationship between clamp force and pull-out strength in lag screw joints of timber members, using data obtained in tightening tests and pull-out tests. Maximum clamp force per unit screw length as determined from the tightening tests was lower than the lower bound for the 95% tolerance range for pull-out strength per unit screw length as determined from the pull-out tests. Moreover, X-ray CT (computed tomography) observations of anchor members from both tests revealed that failure behavior clearly differed between the tightening test and the pull-out test: tightening caused damage to the wooden, female thread in addition to major splitting damage in the wood perpendicular to the grain near the tip of the lag screw.

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Progressive damage analysis of embedment of metal washer into timber

Teranishi,

Matsubara

2024

Wood Material Science & Engineering

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Embedment of Metal Washers into Timber Members of Bolted Timber Joints I.

Cited by 4 publications

References 1 publication

Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints

Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints

Relationship between clamp force and pull-out strength in lag screw timber joints

Progressive damage analysis of embedment of metal washer into timber

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