Memorial de cálculo viga T

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Memorial de cálculo viga T
ξlim = 0,45, se fck <= 35 Mpa
fck = 35 Mpa
bf = 240cm
bw = 40cm
hf = 35cm
h = 250cm
d = 250-4-2 = 244cm
P = 275,23tf/m -> 27,52kN/cm
Fcd = 35/1,4 = 25
σcd = 0,85 * fcd = 21,25 Mpa = 2,125 kN/cm2
Md = ((PxL2 )/8)*1,4 = (27,52x25002 /8) *1,4 = 30.100.000 kN cm
µ = Md/ bf d2 σcd = 30.100.000/ 240 * 2442 * 2,125 = 0,99
ξ = 1-(1-2µ)^0,5/1,4 = 0,0071
ω = As/bfd * fyd/ σcd = 0,0071*240*244*2,125/43,48 = 20,32cm2
As = 2 barras de 40 = 25cm2
As porta estribo = 28mm
As costela = 0,10 de As = 2,5cm2 = Altura 250-35 = 215cm com armadura de 5mm 
19 5 c/12.