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Mechanical Performance of Cross-Laminated Timber Panels
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This research work evaluated the operational capabilities of cross-laminated timber (CLT) by using different layer directions. The use of CLT panels with ±45° alternating layer configurations, opposed to conventional CLT lamellas set at 90° angles, was proved advantageous in respect to timber engineering constructional specifications, which increases the potential use of alternating-layer laminates in more extensive timber constructions. A total of 40 industrially produced panels with either ±45° or 90° layer configuration were subjected to a destructive testing for stiffness and strength in bending or compression. The conducted four-point bending tests on the sample materials revealed a 35% increase in strength for panels with ±45° alternating layers compared with conventional 90°-oriented panels. Their compression strength was also higher by 15%. Furthermore, the level of stiffness in bending and compression was increased by 15% and 30%, respectively. These experimental results showed that CLT panels with a ±45° layer configuration are stiffer and stronger than those of a 90° configuration. A non-contact numerical cross-correlation measurement technique based on digital image correlation (DIC) was also used and identified three dominating load behaviours of CLT panels. The shear strain in bending was found to be five times larger in 90° transverse layers compared with adjacent 0° longitudinal layers of conventional CLT. This indicates that CLT could be further developed as a suitable wood product for more complex construction works.

Place, publisher, year, edition, pages
Keyword [en]
Crosslam, X-lam, KLH, Panel configuration, CLT assembling, CLT manufacturing, Mass timber engineering, Multi-layered engineered wood products, Experimental testing, Influence of orientation
Keyword [sv]
Massivträ, korslimmat trä, KL-trä, träkonstruktion, hållbart byggande, alternativ byggmetod
National Category
Civil Engineering
URN: urn:nbn:se:ltu:diva-59912OAI: diva2:1039555
External cooperation
Martinsons AB; SP Technical Research Institute of Sweden, SP Sustainable Built Environment
Educational program
Wood Engineering, master's level
Available from: 2016-12-05 Created: 2016-10-24 Last updated: 2016-12-06Bibliographically approved

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