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Losa nervada
1.
REPÚBLICA BOLIVARIANA DE
VENEZUELA INSTITUTO UNIVERSITARIO POLITÉCNICO “SANTIAGO MARIÑO” CARRERA: ING. CIVIL (42) SEDE-BARCELONA Profesor: Bachilleres: Ing.Hector Aguana Guzman Marcial C.I: 20636739 Barcelona, Mayo de 2013
2.
Vivienda Losa nervada 7.5 5 6 7 8 1/2 7.5 1 2 3 4 1/2 3.2 3.2 3.2 F´c=350 r
= 7cm Fy = 5000 Carga variable = 150 cm cm cm *Peso propio 3.2 1.5
3.
2cm SOBRE PISO 5cm LOSA 16cm FRISO 3cm -Cerámica = 2x22 =44 -Sobre
piso = 0.05x1900=95 -Peso Propio =0.18x2600=468 -Friso = 0.03x2000=60 667 kg/ Peso variable P.V = 1.4 x 667+1.7 x150 = 1188.8 Carga permanente = 667 Carga variable = 1188.8 Q= 1188.8
4.
1--* 2--* 3--* 4--* Positivos Mu1 Mu2 Mu3 Mu4 Reacciones Isostáticas 1188.8
5.
3.2 A B ∑Fy= 0 D+E =1188.8(3.2
+1.5) D+E =3804.16+1783.2 = 5587.36 ∑Md=0 1188.8(3.2+1.5)+3.2=0 1188.8(3.5+1.2)= 4103.22 6.4 Hiperestáticas 1337.4 1337.4 =417.94 3.2 3.2 1106.66 1106.66 = 345.83 3.2 3.2
6.
1337.4 =417.94 3.2 1337.4= 417.94 3.2 1106.66
=345.83 1106.66=345.83 3.2 3.2 72.11 1337.4x100=133740 1106.66x 100= 110666 1106.66x 100= 110666 Calcular m M= M= Area de Acero As= 72.11
7.
Momentos negativos Mmax A
= Mmax B = Mmax C = Calcular Acero Mínimo Asmin = Asmin =
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