Some bending properties of I-joists made with birch laminated plywood panels

• Autorzy: Spulle U. , Lipinskis I. , Tuherm H.

Identyfikatory

DOI

10.12841/wood.1644-3985.157.09

• Języki publikacji: EN

Abstrakty

EN

Plywood is produced in standard size, therefore, after sawing it to the required size, a certain amount of coarse waste is generated, and the options of usage are limited due to the dimensions. Finding a way to use this coarse waste would mean increasing the amount of usable off cuts or a wasteless production, generating a product with a higher added value and limited costs of raw materials. The research looks at options to use plywood production coarse waste in the production of I-joist and wall framing that are both modern construction materials, and their utilization in construction has a good future prospect. Based on prior strength indicator tests and the specification of available coarse waste, the I-joist structure was chosen. Strength indicators of the manufactured beam samples were also tested to ensure the correct beam structures were selected. The research contains a comparison of indicator data obtained with the relevant strength indicators of I-joists produced by a different manufacturer. Comparing the stiffness EI values of the tested I-joists, they are at times lower than the relevant values of offered I-joists. It is worth mentioning that in all cases the width, depth and consecutively the cross-sectional area of the tested I-joists are slightly smaller than the relevant indicators of the offered I-joists. The indicator by which the tested I-joists are significantly lagging behind the other ones is their self-mass. When compared to LVL (Laminated Veneer Lumber) I-joists produced by “Finnjoist” having the smallest self-mass, the self-mass of the tested I-joists is 23.8% higher, but the moment of inertia is the lowest one at 49.1 cm2 of the relevant values of the offered I-joists.

Słowa kluczowe

EN

birch plywood composite; I-joist; strength; modulus of elasticity; stiffness

• Wydawca: Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
• Czasopismo: Drewno : prace naukowe, doniesienia, komunikaty
• Rocznik: 2017
• Tom: vol. 60, nr 200
• Strony: 125--134
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Spulle U.

• Department of Wood Processing, Latvia University of Agriculture, Jelgava, Latvia

autor

Lipinskis I.

• Department of Wood Processing, Latvia University of Agriculture, Jelgava, Latvia

autor

Tuherm H.

Bibliografia

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• Lipinskis I., Spulle U. [2011]: Research on mechanical properties of birch plywood with special lay-up schemes. Drewno 54 [185]: 109-118
• Ohashi Y., Kawamura S., Hirai T. [2012]: Mechanical properties of wooden I-joists with diagonal plywood webs [accessed: 16.05.2016]. Proceedings of: World Conference on Timber Engineering 2012. Auckland. Available from: http://www.timberdesign.org.nz/files/00479%20Yoshinori%20Ohashi.pdf
• Ohashi Y., Matsumoto K., Hirai T. [2010]: Evaluation of mechanical properties and adjustment factors of wooden I-joists for structural design [accessed: 15.05.2016]. Proceedings of: World Conference of Timber Engineering 2010. New Zealand. Available from: http://support.sbcindustry.com/Archive/2010/june/Paper_231.pdf?PHPSESSID=ju29kfh90oviu5o371pv47cgf3
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• Schuler A., Adair C., Elias E. [2000]: World trends in EWP: USDA Forest Service, APA The Engineered Wood Association [accessed: 24.02.2013]. Available from: www.unece.org
• Volynskii V.N. [2003]: Tekhnologiia kleenykh materialov: uchebnoe posobie dlia vuzov, 2 izd., ispravlennoe i dopoliennoe (Technology of glued materials: study material for higher schools, 2nd edition, corrected and supplemented). Arkhang. gos. tekhn. un-t., Arkhangel'sk
• Wood I Beam Advantages Over Conventional Lumber [2009]: Georgia-Pacific Corporation [accessed: 7.12.2015]. Available from: http://www.gpc.com
• List of standards
• EOTA Technical Report TR 002:2000 Test methods for light composite wood-based beams and columns
• European Technical Approval ETA-06/0238:2011 Light composite wood-based beams and columns for structural use
• EN 314-1:2005 Plywood – Bonding quality – Part 1: Test methods
• EN 314-2:2000 Plywood – Bonding quality – Part 2: Requirements
• EN 13183-1:2003 Moisture content of a piece of sawn timber – Part 1: Determination by oven dry method

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).