Axially loaded glued-in hardwood dowels

Jensen, Jørgen L.; Koizumi, Akio; Sasaki, Takuma; Tamura, Y; Iijima, Y.

doi:10.1007/s002260000076

Cited by 49 publications

(15 citation statements)

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“…Analytical expressions for withdrawal capacity, stiffness and the stress and displacement distributions of single rods can be found in (Stamatopoulos and Malo 2015b;Stamatopoulos and Malo 2016). This model is based on classical Volkersen theory (Volkersen 1938) applied to axially loaded fasteners (Jensen et al 2001). It is assumed that all shear deformation, δ(x), occurs in a shear zone of finite dimensions and it is related to the mean interfacial shear stress, τ(x), by a bi-linear constitutive τ(x)-δ(x) relationship.…”

Section: Analyticalmentioning

confidence: 99%

Withdrawal of pairs of threaded rods with small edge distances and spacings

Stamatopoulos

Malo

2017

Eur. J. Wood Prod.

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An experimental investigation on withdrawal of pairs of screwed-in threaded rods embedded in glued-laminated timber elements is presented in this paper. Specimens with varying angles between the rod axis and the grain direction (α= 15, 30, 60, 90°) and 2 different configurations with respect to edge distances and spacings were tested. The diameter and the embedment length of the rods were 20 mm and 450 mm, respectively. The threaded rods were embedded in a row perpendicular to the plain of the grain. The edge distances and spacings were smaller than the minimum requirements according to Eurocode 5. The withdrawal capacity of pairs of rods was compared to the withdrawal capacity of single rods and the effective number, nef, was found to be in the range 1.72-1.94, despite the small edge distances and spacings. Based on the obtained experimental results, a simple approximating expression was derived for nef. An analytical model based on Volkersen theory with an idealized bi-linear constitutive relationship was used to estimate the withdrawal capacity and stiffness. The analytical estimations were in good agreement with the experimental results. Finally, the withdrawal stiffness was estimated by use of finite element simulations. The numerical estimations for the withdrawal stiffness were also in good agreement with the experimental results.

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Section: Analyticalmentioning

confidence: 99%

Withdrawal of pairs of threaded rods with small edge distances and spacings

Stamatopoulos

Malo

2017

Eur. J. Wood Prod.

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“…Moreover, while some authors have preferred to use a one-sided test set-up [22,41], others have chosen the two-sided set-up [42][43][44]. Jensen et al [45] have accurately described the mechanics of the two test set-ups. However, to date there is no agreement among structural engineers about the correct approach for the design of glued-in connections, as also evidenced by the lack of a standard procedure adopted at European level for this kind of joint.…”

Section: Adhesive Strength Of Bonded Rodsmentioning

confidence: 99%

Adhesives for on-site bonding: Characteristics, testing and prospects

Pizzo

Smedley²

2015

Construction and Building Materials

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“…Slip modulus (G ) is a shear stiffness factor of bond line which is defined as a ratio of shear stress (t) to bond line displacement (slip) within the elastic area (Koizumi et al 1998;Jensen et al 2001). Slip modulus (G ), yield shear stress (t y ), and maximum shear stress (t max ) can be calculated from results of the punching shear test with Eq.…”

Section: Pull-out Tests For Gir Joints Perpendicular To Grainmentioning

confidence: 99%

“…Glued-in-rod (GIR) is the preferred joint method in these structures because of its easy-making, simple formation, high-performance characteristics, and eco-friendly production (Komatsu et al 1997; Koizumi et al 1998;Jensen et al 2001). Against this background, the GIR joint method based on compressed wood (CW) dowel has been proposed to improve the joint performance.…”

Section: Introductionmentioning

confidence: 99%

Improvement of glued-in-rod joint system using compressed wooden dowel

et al. 2010

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The purpose of this study was to develop eco-friendly and high-performance glued-in-rod (GIR) joints using compressed wood (CW), which has higher tensile strength than normal hardwood, instead of conventional wooden dowels. To explore the bonding performance of the dowel and base material, punching shear tests were performed and relationships were established between the density of CW dowel and punching characteristics. Pull-out tests of GIR joints were performed and results were compared with those derived from a mechanical model to evaluate the influence of insertion length of dowel and to define its optimized length. The results indicate that CW dowel has almost the same bonding performance in the density range 330-1000 kg m -3 . Hence, CW as a dowel material in GIR joints has a high application potential. Pull-out tests of GIR joints showed that the insertion length of dowel in GIR joints with the CW-67 dowel is the best if the length is 10 times larger than its diameter. In addition to its satisfactory bonding performance, CW dowels have excellent tensile characteristics.

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Axially loaded glued-in hardwood dowels

Cited by 49 publications

References 0 publications

Withdrawal of pairs of threaded rods with small edge distances and spacings

Withdrawal of pairs of threaded rods with small edge distances and spacings

Adhesives for on-site bonding: Characteristics, testing and prospects

Improvement of glued-in-rod joint system using compressed wooden dowel

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