Improved withdrawal capacity of nail and screw in cross-laminated timber (CLT) made of poplar (Populus alba) using glass fiber-reinforced polymer (GFRP)

Document Type : Research Paper

Authors

1 Department of Wood Science and Technology, Faculty of Natural Resources, University of Zabol, Zabol, Iran.

2 Associate professor of Wood Science and Technology Department of Natural Resources, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili. Ardabil, Iran. Ardabil. Iran

10.22059/jfwp.2022.351422.1225

Abstract

In this study, we investigated the effects of glass fiber-reinforced polymers (GFRP) on the withdrawal capacity of wood, lag screws, and steel nails in cross-laminated timber (CLT) made from poplar (Populus alba). We reinforced CLTs with bidirectional GFRP wrap with a grammage of 600 g/m2. The specimens were 75 mm ×75 mm in length and width, and their thicknesses varied depending on the GFRP layers. We used two-component polyurethane glue at a rate of 300 g/m2. ANOVA results showed that the number of GFRP layers had a significant effect on the withdrawal resistance of nails and lag screws (P<0.05). By increasing the number of GFRP layers in CLT, the withdrawal resistance of the nails, wood screws, and lag screws increased by 280.4%, 29.2%, and 83.3%, respectively, compared to the control CLT samples. The withdrawal resistance of the lag screws was greater than that of the wooden screws and nails. Duncan's Multiple Range Test (MRT) results showed that CLT should be reinforced with at least three layers of GFRP to significantly increase the withdrawal resistance of nails. To significantly increase the withdrawal resistance of lag screws, CLT should be reinforced with at least one layer of GFRP or by three layers for further significant reinforcement.

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References

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