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Télécharger gratuitement le guide (partie I) - cticm

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Application des règ<strong>le</strong>s Eurocodes<br />

Elancement réduit du poteau :<br />

λ c :=<br />

( )<br />

β A.c. × f y t p<br />

= 0.368<br />

σ cr.sl<br />

i :=<br />

I sl.1<br />

A sl.1<br />

= 0.136 m<br />

t p<br />

e 1 :=<br />

2<br />

( )<br />

( )<br />

h st t st.eq × h st + t st × b 2<br />

+ 2t st.eq × h st t st × −<br />

+ b z sl.1 =<br />

2<br />

260.127×<br />

mm<br />

e 2 := z sl.1 = 63.674×<br />

mm<br />

e := e 1 if e 1 ≥ e 2<br />

e 2<br />

otherwise<br />

Facteur d’imperfection α e :<br />

0.09<br />

α e := α 0 + = 0.513<br />

i<br />

e<br />

Coefficient de réduction pour <strong>le</strong> flambement du poteau :<br />

χ c ( φ ) := 1 if λ c < 0.2<br />

1<br />

φ φ 2 λ c<br />

2<br />

− +<br />

otherwise<br />

⎡<br />

⎣<br />

×( )<br />

2<br />

φ := 0.5× 1 + α e λ c − 0.2 + λ c = 0.611<br />

χ c :=<br />

χ c ( φ ) = 0.911<br />

Interaction entre <strong>le</strong> voi<strong>le</strong>ment de plaque et <strong>le</strong> flambement du poteau<br />

Coefficient de pondération ξ:<br />

ξ :=<br />

ξ = 0<br />

σ cr.p<br />

− 1<br />

σ cr.sl<br />

( ) ξ<br />

ρ := ρ − χ ×<br />

Coefficient de réduction final ρ c :<br />

( ) ξ<br />

ρ c := ρ p − χ c × × ( 2 − ξ)<br />

+ χ c = 0.911<br />

Aire efficace p de la <strong>partie</strong> comprimée :<br />

A c.eff := ρ c × A c.eff.loc + b sub.eff × t p = 5.437 × 10 5 × mm 2<br />

⎤<br />

⎦<br />

169

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