Strength classes of structural timber – method comparison

• Autorzy: Rohanová A. , Vacek V.
• Języki publikacji: EN

Abstrakty

EN

Strength classes of structural timber – method comparison. Timber as structural material is predetermined for its use in building industry. Its specificity is a need to be strength graded. Timber quality is expressed in strength classes determined by various methods (destructive, non – destructive). Strength classes of spruce timber were determined by diverse methods. Destructive bending test according with STN EN 408 (C408) and 3 non – destructive methods (flat wise bending - CCB, vibration - CMTG, a visual -CVIZ) were applied. Non – destructive methods were compared to the most objective method C408. Strength of correlation between methods (C408 and CCB, CMTG and Cviz) was assessed by statistical characteristics. The most significant correlation was determined for C408 and CCB. In the highest strength class C30, the most reliable method is CCB and the least reliable is Cviz. In grading process, the CMTG method is the most overestimating, the Cviz overestimates less and the CCB method is the least overestimating. The CCB grading method is the most important from the point of view of reliable strength class determination.

Słowa kluczowe

EN

structure timber; destructive bending test; non – destructive method; comparison; strength class

• Wydawca: Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
• Czasopismo: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
• Rocznik: 2012
• Tom: No. 79
• Strony: 214--217
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Rohanová A.

• Faculty of Wood Sciences and Technology, Technical University in Zvolen

autor

Vacek V.

• Faculty of Wood Sciences and Technology, Technical University in Zvolen

Bibliografia

• 1.PAZLAR, T. - SRPČIČ, J. - PLOS, M. - TURK, G. 2011: Non-destructive tests for strength grading of Slovenian structural sawn timber. In 17th International nondestructive testing and evaluation of wood symposium : proceedings : September 14-16, 2011 Sopron, Hungary. Volume 1 / ed. Ferenc Divos. - Sopron : University of West Hungary, 2011. - ISBN 978-963-9883-82-6. - P. 231-238.
• 2.TRIOLA, M. F. 1989: Elementary Statistics. Fourth edition. Benjamin Cummings Publishing Company, Inc., ISBN 0-8053-0271-9, 784 p.
• 3.WEIDENHILLER. A. - DENZLER, J. K. 2009: Optimising machine strength grading with three indicating properties”. In: Proceedings of the Economic and technical aspects of quality control for wood and wood products. Cost Action E53 Conference 22nd – 23rd October 2009, Lisbon, Portugal. Paper #7.
• 4.STN 49 1531 Drevo na stavebné konštrukcie. Časť 1:Vizuálne triedenie podľa pevnosti. 2001.
• 5.STN EN 338 Konštrukčné drevo. Pevnostné triedy. 2010.
• 6.STN EN 384 Konštrukčné drevo. Zisťovanie charakteristických hodnôt mechanických vlastností a hustoty. 2010.
• 7.STN EN 408 Drevené konštrukcie. Konštrukčné drevo a lepené lamelové drevo. Stanovenie niektorých fyzikálnych a mechanických vlastností. 2011.
• 8.STN EN 14 081-4 Drevené konštrukcie. Pevnostne triedené konštrukčné rezivo s pravouhlým prierezom. Časť 4: Strojové triedenie. Nastavenia triediacich strojov pre strojovo riadené systémy. 2009.