Tuchschmid-WALM® Têtes de poinçonnement - Debrunner Acifer
Tuchschmid-WALM® Têtes de poinçonnement - Debrunner Acifer
Tuchschmid-WALM® Têtes de poinçonnement - Debrunner Acifer
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
E x e m p l e <strong>de</strong> calc ul<br />
6 . 2 C o l o nne int é r i e u r e, d a lle pré c o n t r a int e<br />
6.2.1 Vale urs initia le s<br />
B é ton C 25/30 ⇒ τc =1.00 N /mm 2<br />
G r a nulomé trie m a xi D m a x =32 ⇒ k D m a x =1<br />
A c ie r àbé ton B 500B f s d =435 N /mm 2<br />
⇒ k fs =1<br />
D a lle 360 mm ⇒ d =320 mm<br />
Taux d ’a rma ture ρ =1.0% ( a rma ture p a ssiv e )<br />
E space m e nt <strong>de</strong>s c olonne s 8 m<br />
D ime nsion <strong>de</strong>s c olonne s 300 x300 mm<br />
Vale ur <strong>de</strong> d ime nsionne m e nt<br />
„réac tion d ’a ppui“ A d =2800 k N (introd u c tion <strong>de</strong> lach a rge <strong>de</strong> lada lle da ns<br />
lacolonne )<br />
P r écontra int e 4x3torons Ø 15.7 mm p a r d irection ( ban <strong>de</strong>s d ’a ppui)<br />
Section <strong>de</strong> toron A p =150 mm 2<br />
Résista n ce à la traction f pk =1770 N /mm 2<br />
I n c lin a ison <strong>de</strong>s câb le s <strong>de</strong><br />
précontr a inte β P =5°<br />
P r écontra int eàl’insta nt t=∞ ≅ 0.9⋅<br />
A ⋅ 0.7⋅<br />
f ⋅ 4 ⋅ 3 pour c h a que direction<br />
6.2.2 P rocéd ure<br />
P ∞<br />
P pk<br />
P ≅ 0.9 ⋅ 150 ⋅ 0.7 ⋅ 1.770 ⋅ 4 ⋅ 3 =<br />
∞<br />
2007 k N / R ic htung<br />
Le f act e ur 0.9 tie nt c ompte approxima tive m e nt <strong>de</strong>s pe rte s <strong>de</strong><br />
précontr a inte p a rre tra it, flua g eetre la x a tion.<br />
Le calc ul s edistingu e<strong>de</strong>ce lui d 'une da lle av ec a rma tur e p a ssive en <strong>de</strong>ux points:<br />
• P our la sollic ita tion, on calc ule la v a le ur <strong>de</strong> d ime nsionne m e nt <strong>de</strong> l’e ffort tr a n c h a nt e n<br />
soustr a y a nt l’e ffe tpositif <strong>de</strong> la précontr a inte . La d iminution c orr e spond àla somm e<strong>de</strong> toute s<br />
le sforces <strong>de</strong> dévia tion a u-<strong>de</strong>ssus <strong>de</strong> la surface d’introd u c tion <strong>de</strong> lach a rge .(a rt. 4.3.6.2.2)<br />
• P our la r é sista n ce, le mome nt <strong>de</strong> c omp a r a ison m 0 d p e ut être r e mplacé p a rla v a le ur m 0 d –<br />
m Pd.<br />
D o c ume nta tion TUC HSC HMID - W A LM ® (se pte m b r e 2007) 2 5