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ID number:551923
 
Author:
Evaluation:
Published: 20.04.2011.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

Uzdevums:
Noteikt normālos spriegumus koksnē centriski stieptā elementā. Noteikt nepieciešamo tapu daudzumu, minimālo dēļa platumu h un minimālo uzliktņa garumu Luzl un biezumu t1.

Stiepes spēks NST = 8kN/m.
Savienojamo dēļu biezums t2 = 25mm.
Tapas diametrs = 16mm.
Lietojamības klase – Ilgstošā 2.
Koksnes stiprības klase - C14.

ft,0,k = 8N/mm2
ρk = 290kg/m3
kmod = 0,7
kh = 1 (ja h lielāks par 150 mm)
γm = 1,3 - matetiāla lietošanas drošības koef. līmētai koksnei
t2 = 25mm
d = 16mm
Nst = 8kN
t1 = 25mm (pieņemts)
Skrūves klase – 8,8
Skrūves fu,k = 800N/mm2
γQ = 1,5
Ntd = 8*1,5 = 12kN…

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