The impact of the pine annual ring width on the screw withdrawal resistance
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2016, Vol 96, Issue 1
Abstract
This paper presents investigation of the impact of the pine wood (Pinus sylvestris L.) annual ring width on the screw withdrawal resistance. For tests samples made of 2-layer laminated pine wood were used: Solid lam and Lam FJ. Samples made of Solid Lam were divided on to the three sets with different annual ring width: slow a. r. w. 0.64-2.5mm, medium a. r.w. 2.5-3,5mm and fast a. r. w. 3.5-4.6mm. Samples made of Lam FJ varied in annual growth ring. Screws used in industry practice were screwed in tested samples. The screw withdrawal resistance were determined using empiric method according PN_EN 1382:2000. Characteristic screw withdrawal resistance were calculated according Eurocode 5. Correlations withdrawal resistance and wood density were determined for each wood sample set and for all samples. As a result of test it was found that for all samples coefficient of correlation of withdrawal resistance and wood density was 0.71. and it was found that growth ring width does not influence withdrawal resistance and the differences between average values are not statistically significant for the same class of wood. Tested pine wood fulfils the requirements of Eurocode 5. Keywords:
Authors and Affiliations
ANDRZEJ TOMUSIAK, MAREK GRZEŚKIEWICZ
Keywords
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