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h<br />

= 3500 mm<br />

d s<br />

= h - t s<br />

= 3375 mm<br />

f~ = 0,6*1860*0,8 = 892,8 Mpa<br />

f 1<br />

c<br />

= 35 Mpa i f = 400 Mpa<br />

y<br />

Mua<br />

= 172440,0 kN.m<br />

~, = 1,09 - 0,008*35 = 0,81<br />

1. Calcul de fpsi équation (5-6)<br />

f~ = 1860*(1 - 0,4/0,81 * 39200/(5000*3150) * 1860/35)<br />

1738,51 Mpa<br />

2. Calcul de ai équation (5-4)<br />

a = 39200/(0,85*35*5000) = 458,15 mm' .<br />

On a a < t; alors la section a un comportement de poutre a section<br />

rectangulaire.<br />

3. Calcul de M up équation (5-5)<br />

M up = 39200*1738,51*(3150 - 0,5*458,15) = 199060*10 6 N.mm'.<br />

or Mua<br />

= 172440 kN.m<br />

on a bien M up > Mua' alors on a juste besoin d'armature ordinaire<br />

minimale pour résister aux contraintes dues à<br />

la température et au<br />

retrait.<br />

page 89 Chapitre 5

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