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Link til appendiks - 2007 FBJ Home

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C.2 Kipning 50<br />

Figur C.7: Moment over den nederste del af rammebenet.<br />

Værdien for kl udregnes vha. formel C.9:<br />

kl =<br />

<br />

0, 081 · 10 6 MP a · 3570 · 10 3 mm 4 · (3500mm) 2<br />

0, 179 · 10 6 MP a · 3820 · 10 9 mm 6 = 2, 3 (C.10)<br />

Forholdet mellem endemomenterne er 0, hvilket medfører, at m6 iht. [Stålkonstruktioner,<br />

2005, Tabel 8.1] er 11,66. Nu kan det kritiske moment udregnes vha. formel<br />

C.8:<br />

Mcr = 11, 66 · 0, 179 · 106 MP a · 108, 2 · 10 6 mm 4<br />

(3500mm) 2<br />

= 6, 93 · 10 9 Nmm<br />

· (400mm − 24mm) 2<br />

Herved kan det relative slankhedsforhold bestemmes ud fra formel C.7:<br />

λ = 1, 05 ·<br />

<br />

2880 · 10 3 mm 3 · 192MP a<br />

6, 93 · 10 9 Nmm<br />

= 0, 3<br />

Eftersom det relative slankhedsforhold er under 0,4, opstår der ikke kipning.

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