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

Pang, Sung-Jun; Ahn, Kyung-Sun; 강석구,; Oh, Jung-Kwon

doi:10.1186/s10086-020-01926-8

Cited by 15 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All specimens in this direction showed the splitting failure of the wood layer’s fibers, and the failure only happened around the fasteners. Pang et al [ 61 ] reported the same results. Fasteners in this loading direction (T) demonstrated a higher withdrawal resistance than in the L direction.…”

Section: Resultssupporting

confidence: 61%

Withdrawal Performance of Nails and Screws in Cross-Laminated Timber (CLT) Made of Poplar (Populus alba) and Fir (Abies alba)

et al. 2022

View full text Add to dashboard Cite

Cross-laminated timber (CLT) can be used as an element in various parts of timber structures, such as bridges. Fast-growing hardwood species, like poplar, are useful in regions where there is a lack of wood resources. In this study, the withdrawal resistance of nine types of conventional fasteners (stainless-steel nails, concrete nails and screws, drywall screws, three types of partially and fully threaded wood screws, and two types of lag screws), with three loading directions (parallel to the grain, perpendicular to the surface, and tangential), and two layer arrangements (0-90-0° and 0-45-0°) in 3-ply CLTs made of poplar as a fast-growing species and fir as a common species in manufacturing of CLT was investigated. Lag screws (10 mm) displayed the highest withdrawal resistance (145.77 N), whereas steel nails had the lowest (13.13 N), according to the main effect analysis. Furthermore, fasteners loaded perpendicular to the grain (perpendicular to the surface and tangential) had higher withdrawal resistance than those loaded parallel to the grain (edge). In terms of the layer arrangement, fasteners in CLTs manufactured from poplar wood (0-45-0°) had the greatest withdrawal resistance, followed by CLTs manufactured from poplar wood in the (0-90-0°) arrangement, and finally, those made from fir wood in the (0-90-0°) arrangement. The fastener type had the most significant impact on the withdrawal resistance, so changing the fastener type from nails to screws increased it by about 5–11 times, which is consistent with other studies. The results showed that poplar, a fast-growth species, is a proper wood for manufacturing CLTs in terms of fastener withdrawal performance.

show abstract

Section: Resultssupporting

confidence: 61%

Withdrawal Performance of Nails and Screws in Cross-Laminated Timber (CLT) Made of Poplar (Populus alba) and Fir (Abies alba)

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the single-wall model, the closest connector to the rotation point was not reached the yield strength. However, in the single-coupled-panel model, all connectors reached the yield strength when the maximum rotation angle happened, because more displacement (12) happened at the connectors on panel 1 due to the displacement between panel 1 and panel 2 (mm). Thus, the predicted values by the single-coupled-panel model were higher than those by the single-wall model.…”

Section: Comparisons Of Predicted Value With Experimental Datamentioning

confidence: 98%

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Both timber and plywood were made from the larch (Larix kaempferi Carr.) species, and the air-dry density values were 578.9 and 708.4 kg/m 3 , respectively (Pang et al 2020). The density of wood was calculated from the air-dry weight and air-dry volume at the test moisture content (12 ± 2%) according to BS EN 384.…”

Section: Fire Test Specimenmentioning

confidence: 99%

Effect of intumescent coating on the charring rate of nail-laminated timber

Pang

Ahn

Kim

et al. 2022

BioRes

Self Cite

View full text Add to dashboard Cite

Intumescent coating was studied relative to the fire performance of nail-laminated timber. Three NLT specimens were coated with three different intumescent coating thicknesses (1, 2, and 3 mm) in even-numbered laminae and compared to uncoated NLT specimens. As a result of the coating, the internal temperature of the coated specimen increased more slowly than that of the uncoated specimen. The average charring rate of the intumescent coating specimen was reduced by 12.8% (1-mm thickness), 14.1% (2-mm thickness), and 15.4% (3-mm thickness) compared with the uncoated specimen. However, statistical analysis showed there was no significance between 1-, 2-, and 3-mm coating thicknesses. The combustion of wide surfaces of timber laminae between the plywood was delayed due to the coated plywood, and the timber laminae became a one-dimensional charring rate problem. Therefore, if even laminae are coated with an intumescent, then the NLT can be designed with a one-dimensional charring rate condition.

show abstract

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

Cited by 15 publications

References 30 publications

Withdrawal Performance of Nails and Screws in Cross-Laminated Timber (CLT) Made of Poplar (Populus alba) and Fir (Abies alba)

Withdrawal Performance of Nails and Screws in Cross-Laminated Timber (CLT) Made of Poplar (Populus alba) and Fir (Abies alba)

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

Effect of intumescent coating on the charring rate of nail-laminated timber

Contact Info

Product

Resources

About