Screw Withdrawal Performance of Hybrid Cross-Laminated Timber (CLT) Manufactured from Spruce (Picea abies), Beech (Fagus sylvatica) and Hungarian Poplar (Populus spp.)

Garab, József és Tóth, Zsolt György és Altaher Omer Ahmed, Ahmed és Bejó, László (2026) Screw Withdrawal Performance of Hybrid Cross-Laminated Timber (CLT) Manufactured from Spruce (Picea abies), Beech (Fagus sylvatica) and Hungarian Poplar (Populus spp.). FORESTS, 17 (5). ISSN 1999-4907

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first_pagesettingsOrder Article Reprints Open AccessArticle Screw Withdrawal Performance of Hybrid Cross-Laminated Timber (CLT) Manufactured from Spruce (Picea abies), Beech (Fagus sylvatica) and Hungarian Poplar (Populus spp.) by József Garab 1,*ORCID,Zsolt György Tóth 2ORCID,Ahmed Altaher Omer Ahmed 1ORCID andLászló Bejó 1ORCID 1 Institute of Applied Sciences, Faculty of Wood Engineering and Creative Industry, University of Sopron, 9400 Sopron, Hungary 2 Institute of Basic Sciences, Faculty of Wood Engineering and Creative Industry, University of Sopron, 9400 Sopron, Hungary * Author to whom correspondence should be addressed. Forests 2026, 17(5), 590; https://doi.org/10.3390/f17050590 (registering DOI) Submission received: 14 March 2026 / Revised: 29 April 2026 / Accepted: 8 May 2026 / Published: 13 May 2026 (This article belongs to the Special Issue Advanced Technology for Extraction, Processing and Testing of Forest Products) Downloadkeyboard_arrow_down Browse Figures Versions Notes Abstract Screw withdrawal force is a key mechanical property related to the load-bearing capacity and reliability of mechanically fastened timber structures. This study investigates the screw withdrawal performance of cross-laminated timber (CLT) manufactured from spruce, beech, and poplar, including both homogeneous and hybrid layups. The selected species represent materials with different densities and regional availability in Hungary. A one-component polyurethane adhesive was used for panel manufacturing. Screw withdrawal force was determined using two methods: a universal testing machine (UTM) and a manual portable device (MPD). The highest withdrawal forces were observed in beech-based configurations, while the lowest values were measured for spruce. Poplar-based configurations demonstrated intermediate but competitive performance, exceeding the reference spruce values. Statistical evaluation confirmed a significant effect of layup configuration on withdrawal resistance. The MPD measurements were on average approximately 9% higher than UTM results, indicating a consistent and quantifiable inter-method difference. The results demonstrate that hybrid CLT configurations can be optimized by combining species of different densities and that portable testing methods provide reliable estimates of withdrawal performance. These findings contribute to the understanding of connection behavior in hybrid CLT and support the practical application of semi-destructive testing methods for in-situ assessment.

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műszaki tudományok > anyagtudományok és technológiák
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Mű tipusa:	Cikk
SWORD Depositor:	Teszt Sword
Felhasználó:	Csaba Horváth
A mű MTMT azonosítója:	MTMT:37200296
Dátum:	27 Máj 2026 07:46
Utolsó módosítás:	27 Máj 2026 07:46
URI:	http://publicatio.uni-sopron.hu/id/eprint/4063

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