Moment and shear capacity of Ply-lam composed with plywood and structural timber under out-of-plane bending

Pang, Sung-Jun; Lee, Hyeon-Jeong; Yang, Seung Min; 강석구,; Oh, Jung-Kwon

doi:10.1186/s10086-019-1847-8

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…Moreover, the dimensional stability and thermal conductivity of Ply-lam was better than typical CLT [24][25][26][27], and fire-retardant treated plywood can be used for fire resistance improvement. The structural characteristic of Ply-lam under out-of-plane bending was also investigated [28], but the withdrawal resistance of screws in Ply-lam needs to be investigated to provide a reasonable design method.…”

Section: Introductionmentioning

confidence: 99%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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The aim of this study was to predict the withdrawal resistance of a screw in hybrid cross-laminated timber (CLT) composed of two types of lamina layers. A theoretical model to predict the withdrawal resistance was developed from the shear mechanism between a screw and the layers in hybrid CLT. The parameters for the developed model were the withdrawal stiffness and strength that occurs when a screw is withdrawn, and the penetration depth of a screw in layers of a wood material. The prediction model was validated with an experimental test. Screws with two different diameters and lengths (Ø6.5 × 65 mm and Ø8.0 × 100 mm) were inserted in a panel composed of solid wood and plywood layers, and the withdrawal resistances of the screws were evaluated. At least 30 specimens for each group were tested to derive the lower 5th percentile values. As a result, the developed model predictions were 86–88% of the lower 5th percentile values of hybrid CLT from the properties of the lamina layer. This shows that the withdrawal resistance of hybrid CLT can be designed from the properties of its layer.

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Section: Introductionmentioning

confidence: 99%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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“…In addition to active research on CLT, domestic CLT production facilities are being introduced. CLT is being produced by using domestic larch lamina layer and Ply-lam CLT with plywood mixed and laminated to improve yield (Pang et al, 2019;Choi et al, 2020). In particular, domestically produced larch plywood is used for Ply-lam CLT, and it is easy to manufacture Ply-lam CLT with a length of 2,440mm according to the plywood standard.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Flexural Performance According to the Plywood Bonding Method of Ply-Lam CLT

Choi¹,

Yang²,

Lee³

et al. 2021

Journal of the Korean Wood Science and Technology

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The purpose of this study is to optimize the bonding method of the plywood suitable for cross-laminated timber (CLT) with plywood as a core by analyzing the flexural performance and failure mode according to the lamina species, the method of bonding plywood in the longitudinal direction, and whether or not adhesive is applied to the joint. In the case of the Douglas fir lamina layer, the modulus of elasticity decreased by about 11.5% due to longitudinal bonding, and the modulus of rupture increased or decreased according to the adhesive application and bonding method. The optimal conditions were derived as the butt joint without adhesive, half lap joint with adhesive, and butt joint. In the case of the larch lamina layer, the modulus of rupture and the modulus of elasticity decreased by about 15% and 40%, respectively. When using the half lab joint and tongue & groove joint, it is believed that it reduces the load transmitted to the middle layer by primarily preventing the failure on flexure at the joint of the plywood layer. From the results of this study, the larch lamina layer used in the manufacturing process of Ply-lam CLT did not show any difference based on the bonding method. Butt joint and half lap joint bonding method are determined to be suitable when using Douglas fir lamina layer.

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“…The dimensional stability and thermal conductivity of Ply-lam were better than typical CLT [7][8][9][10]. The structural characteristics of Ply-lam under out-of-plane bending and the withdrawal resistance of screws in Ply-lam was investigated [11,12], but the structural performance for shear walls have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

et al. 2021

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In this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.

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Moment and shear capacity of Ply-lam composed with plywood and structural timber under out-of-plane bending

Cited by 12 publications

References 17 publications

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Evaluation of Flexural Performance According to the Plywood Bonding Method of Ply-Lam CLT

Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

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