PREDIMENSIONADO DE VIGAS

α=9 bmin=25cm

∅=0.9 b=B/20

f ´ c=280 kg/cm2 fy=4200kg /cm2

ρ=0.007 Wu¿)

w= ρ x fyf ´ c

=0.007x 4200280

=0.105 d= h1.1

h1.1

= ln x√ Wux B

9x 0.9 x280 x B20x 0.105(1−0.5 X 0.105)

h= ln

( 3.04√Wu

) ........... (1)

S/C = 400kg/m2

P. Aligerado = 350kg /m2

P. Acabado = 100 kg / m2

Tabiquería Móvil = 210 kg/m2

C. V. = 400kg/m2

C.M. = 660kg/m2

Wu = 1.4 C.M. + 1.7 C.V. Wu = 1604 kg/m2 = 0.16 kg / cm2

Reemplazando en (1) : h= ln7.6

VIGA PRINCIPAL 2 (C3 -C4)

Piso Luz (m) h (m) h (redondeo) b (m)

1 7.3 0.96 1 0.32 7.35 0.97 1 0.33 7.3 0.96 1 0.34 7.4 0.97 1 0.35 7.45 0.98 1 0.36 7.5 0.99 1 0.37 7.55 0.99 1 0.38 7.625 1.00 1 0.39 7.675 1.01 1.05 0.3

10 7.75 1.02 1.05 0.3

VIGA PRINCIPAL 1 (C1 -C2)

Piso Luz (m) h (m) h (redondeo) b (m)

1 7.175 0.94 0.95 0.32 7.225 0.95 0.95 0.33 7.275 0.96 1 0.34 7.275 0.96 1 0.35 7.325 0.96 1 0.36 7.375 0.97 1 0.37 7.425 0.98 1 0.38 7.525 0.99 1 0.39 7.600 1.00 1 0.3

10 7.700 1.01 1.05 0.3