losvol.pdf
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EJEMPLO CALCULO DE LOSA DE CALZADA TABLERO con 5 vigas
CALCULO DE LOSA DE CALZADA
Datos del Tablero: Materiales:Ancho total tablero A = 9.80 mts. fc' = 250 kg/cm2Ancho aceras + defensa Aa = 0.80 mts. fy = 4.200 kg/cm2Altura aceras Ha = 0.00 mts. Pc = 2.500 kg/m3Ancho isla central Aic = 0.00 mts. Pasf = 2.200 kg/m3Altura isla central Hic = 0.00 mts.Ancho libre de calzada Alc = 9.00 mts. Resultados:Numero de vigas Nv = 5.00 und. Luz de cálculo losa: Scl = S-bv/2 = 1.86 mts.Ancho ala superior viga bv = 0.20 mts.Espesor de la losa calzada e = 0.18 mts. W pm = ((A*e+Aa*Ha+Aic*Hic)*Pc +Espesor carpeta rodam. ecr = 0.07 mts. Alc*ecr*Pasf + Pb*2)/A = 714 kg/mlLuz volado de calzada Sv = 0.98 mts.Separación entre vigas S = 1.96 mts. Mpm = [Wpm*Scl^2/10]*1.3 = 321 kg-mt Peso baranda o defensa Pb = 600 kg/mlSobrecarga en Aceras SCa = 0 kg/m2 Mcv+i = [0.8*((Scl+0.61)/9.74)*Pr*I]*2.17 = 4.989 kg-mtPeso Rueda may. (20% ) Pr = 8.717 kgsImpacto Lat. Acera (20%) Plat = 893 kgs M Total mayorado = Mpm + Mcv+i = 5.310 kg-mt
As = 11.88 cm2 Usar Cab. # 6 a 20 cms.
As Rep = 121/ÖS (max. 67%) = 86 % As rep = 7.94 cm2 Usar Rep. # 5 a 20 cms.
SECCION TRANSVERSAL TABLERO
0.40 9.00 0.40
9.80
1.96 1.96 1.96 1.96 0.980.98
0.90
0.90
0.18
0.10
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CALCULO DEL VOLADO DE CALZADA
Datos del Tablero: Resultados:Punto aplicación P al apoyo X = 0.23 mts. Luz de cálculo volado: Scv = Sv-bv/4 = 0.93 mts.Ancho Efectivo E = 1.327 mts.Impacto en losa I = 30 % M pm = [(e*Scv^2/2+Ha*Aa/2*(Scv-Aa/4))*
*Pc + Pb*(Scv-.2)+(Scv- Aa/2)^2*ecr*Pa]*1.3 = 676 kg-mt
Mcv+i = [(Pr*X+Plat*Ha+Aa*SCa* *(Scv-Aa/4)^2/2)*I/E]* 2.17 = 4.262 kg-mt
M Total mayorado = M pm + M cv+i = 4.938 kg-mt
As = 10.96 cm2. Usar Cab. # 6 a 20 cms.