BF, Dept. of Wood Technology, Lj. (BFLES)
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Vpliv grč na trdnost smrekovega in jelovega konstrukcijskega žaganega lesa : diplomsko delo - visokošolski strokovni študij = Knot influence on the strength of a spruce and fir structural sawn timber : graduation thesis - higher professional studiesCvek, Marko, 1985-Grče zmanjšujejo uporabnost lesa, saj je na mestih grč močno spremenjen potek oz. lokalni naklon lesnih vlaken, zato ima grčav les slabše mehanske lastnosti. V nalogi smo ugotavljali, kakšne so ... povezave med grčavostjo in mehanskimi lastnostmi lesa ter primerjali različna pravila ocenjevanja grčavosti. Grče smo ocenjevali po pravilih, ki so podana v DIN 4074-1 standardu in BS 4978 standardu. Položaj in velikost grč smo določali na 475 smrekovih in jelovih konstrukcijskih elementih dimenzij 50 mm x 150 mm x 4000 mm. S štiri-točkovnim upogibnim preskusom smo elementom določili globalni modul elastičnosti in upogibno trdnost. Ugotovili smo, da grčavost vpliva na trdnost, da pa je napovedovanje trdnosti samo na podlagi grč dokaj nezanesljivo (r = 0,27 do 0,56). Najzanesljivejše je napovedovanje trdnosti na podlagi ocene grčavosti po pravilih DIN 4074-1 standarda za razvrščanje nosilcev (parameter A; r = 0,56) in na podlagi ocene deleža grč v prerezu nosilca po BS 4978 standardu (parameter tKAR; r = 0,54). Najmanj zanesljiv kriterij za ocenjevanje grč je globina bočnih grč (parameter EBB; r = 0,28). Izkoristek razvrščanja je bil višji pri razvrščanju na podlagi BS 4978 standarda, pri razvrščanju po DIN 4074-1 standardu pa je bil zelo visok delež (87,4 %) prenizko razvrščenih elementov.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Cvek], 2016Language - slovenianCOBISS.SI-ID - 2592905
Author
Cvek, Marko, 1985-
Other authors
Gornik Bučar, Dominika |
Šega, Bogdan |
Straže, Aleš
Topics
konstrukcijski les |
smrekovina |
grče |
tKAR |
trdnost |
construction wood |
spruce wood |
knot |
tKAR |
strength
Call number – location, accession no. ... |
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Knjižnica BF za lesarstvo vsn 0000000401 IN: 020160093 Knjižnica BF za lesarstvo vsn 401 IN: 020160093 |
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Cvek, Marko, 1985- | |
Gornik Bučar, Dominika | 10340 |
Šega, Bogdan | 13057 |
Straže, Aleš | 18149 |
Source: Personal bibliographies
and: SICRIS
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