Exemplo Armadura dupla
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Transcript of Exemplo Armadura dupla
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Exem plo: Calcular a arm adura longitudinal de flexo na regio m ais solicitada a flexo da viga
abaixo:
Coeficientes Materiais Seo Carregam ento
c 1.4 fck 25 MPa bw 15 cm qk 80 kN
m
s 1.15 fy 500 MPa d 45 cm qd =qk c 112 kN
m
kz3.4 0.7485 Es 210 GPa c 2.5 cm la 4.5 m
c %0.35 est 5 mm lb 2 m
ys =fy
Es s0.00207 d' =++c est
10
2mm 35 mm
fcd =fck
c17.857 MPa
fyd =fy
s434.783 MPa
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1-Clculo do Mom ento Solicitante
Md.pos =qd
8 la2 +la lb
2 la lb
2182.562 kN m
Md.neg =qd lb
2
2224 kN m
Md Md.neg
2-Altura Mnim a
dmin =1.8Md
bw fcd520.529 mm dm in>d
3-Clculo do M3,4
x3.4 =c
+c ysd 0.283 m
M3.4 = +0.272 x3.4
20.68 d x3.4
bw fcd 173.504 kN m
4-Clculo M2
M2 =Md M3.4 50.496 kN m
5-Clculo do As
As =+M3.4
kz3.4 d fyd
Md M3.4fyd (( d d'))
14.646 cm2
As' =M2
fyd (( d d'))2.799 cm
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