1. This document provides load calculations and structural member sizing for a typical portal frame structure. 2. Load calculations include dead loads, live loads, snow loads, and wind loads. The critical load combinations are identified. 3. Structural members are then sized to resist the critical load combinations. The columns, beams, and diagonal bracing are all checked and found to be adequate for the calculated loads.

1. KVAERNER
ANIONIC PLOCCULANT
1
1 CORREA DE TIPICA
 Peso Propio = 5 kg/m²
 TCA-804 = 15 “
 Cielo raso = 10 “
 S/C Techo = 30 “
 Viento:
V=135 km/hr qs=85 kg/m²
Segun UBC.
2. PÓRTICO TÍPICO
2.1 METRADO DE CARGAS
CARGAS MUERTAS
 Peso propio
 Correas
 Cobertura (TR-4)
= 20 kg/m2
= 10 “
= 10 “
= 40 kg/m2

2. KVAERNER
ANIONIC PLOCCULANT
2
WD = 40 kg/m2 x 2.70 m = 108 kg/m
CARGAS VIVAS
Area tributaria= 15.93m² = 171.38 ft²
 Carga viva (Al 100%) = 100 kg/m2
= 60 kg/m2
WL = 100 kg/m2 x 2.70 m = 270 kg/m
CARGAS NIEVE
 Carga nieve = 100 kg/m2
= 100 kg/m2
WS = 100 kg/m2 x 2.70 m = 270 kg/m
CARGAS DE VIENTO
V = 84 MPH = 135 km/h
P= Ce.Cq.qs.Iw =
qs = 85 kg/m2
Ce = 1.06
Iw = 1.00
TECHOS
 Succión : q = 90 x (-0.70) = -63 kg/m2
Ww = -63 kg/m2
x2.70 m = -170 kg/m
PAREDES
 A barlovento : q = 90 x (0.80) = 72 kg/m2
Ww = 72 kg/m2
x2.70 m = 195 kg/m
 A sotavento : q = 90 x (-.050) = -45 kg/m2
Ww = -45 kg/m2
x2.70 m = -122 kg/m

3. KVAERNER
ANIONIC PLOCCULANT
3
CARGAS DE SISMO
 Carga muerta
 Carga viva (25%)
= 40 kg/m2
= 25 “
q = 65 kg/m2
W = 65 x 7.00 x 8.00 = 3640 kg
UBC Zona 3: Z = 0.3
Perfil de suelo SD
I = 1.0
Cv = 0.54
R = 4.5
Ca = 0.36
Na = 1.0
Nv = 1.0
T = Ct(hM)3/4
= 0.0853 (6.50)3/4
= 0.3472
V = Cv.I/(R.T).W = (0.54x1.0) x W /(4.5x0.3472) = 0.34W
No debe de ser mayor que:
V = 2.5 Ca.I W / R = 2.50x0.36x1.00/4.5x W=0.20xW
Ni menor que:
V = 0.11Ca.I W = 0.04 W
De donde:
W = 65x5.90x2.7= 1036 kg
V = 0.20 (1036) = 207 kg
CARGAS DE LA VIGA CARRILERA
Carga en el centro de luz para la posición mas desfavorable de la carga (bajo
cumbrera).
P=923 Kg.
Carga en el nudo de columna debido al peso propio de la viga carrilera.
P=26 Kg.
COMBINACIONES
1) D + S+ DLe
2) D + 0.75S + 0.5 W+ DLe
3) D + 0.5S + W+ DLe

4. KVAERNER
ANIONIC PLOCCULANT
4
4) D + L + E+ DLe
*************
2.2 DIMENSIONAMIENTO
COLUMNA H = 5.10 m
Es crítica en la COMBINACIÓN (4)
P = 3273 kg
M = 4465 mkg
 Suponiendo W 12 X 26 A = 7.65 in2
= 49.35 cm2
Ix = 204 in4
= 8491.12 cm4
donde: Para vigas W 8 x 18 Iy = 17.3 in4
= 720.08 cm4
GA = 10 Sx = 33.4 in3
= 547.32 cm3
GB = (1/510) / (1/400) = 0.78 rx = 5.17 in = 13.13 cm
KxLx / rx = 1.80 x 510/13.13 = 70 ry = 1.51 in = 3.83 cm
rT = 1.72 in = 4.36 cm
En la dirección secundaria (pórtico ariiostrado)
KyLy / ry = 1.0 x 510/3.83 = 133 (CONTROLA)
Fa = 593 kg/cm2
fa = 3273 / 49.35 = 66.32 kg/cm2
fa / Fa = 66.32/593 = 0.11 < 0.15
Lb = 510 cm
Cb = 1.75
l/rT = 510 / 4.36 = 117
y
b F
/
xC
x
. 3
10
42
7171 =70.41  l/rT  y
b F
/
xC
x
. 6
10
85
35 =157.4
Fb = [2/3 – (Fy(l/rT)2
)/(1075.71x105
Cb)] Fy
Fb = 0.48 x 2530 = 1214 kg/cm2
Fb = (843.69 x 103
Cb) / (ld/Af) = 1485 kg/cm2
Fbmax = 1485 kg/cm2
fb = 4465 x 100 / 547.32 = 815.79
fb / Fb = 815.79 / 1485 =0.55
fa / Fa + fb / Fb = 0.11 + 0.55 =0.66  1.0 (O.K.)

5. KVAERNER
ANIONIC PLOCCULANT
5
USAR W 12 x 26
VIGA
Es crítica en la COMBINACIÓN (4)
M = 4465 kg.m
Suponiendo W 8 X 18 Sx = 33.4 in3
= 547.32 cm3
rT = 1.72 in = 4.36 cm
Lb = 400 cm
Cb = 1.75 +1.05(2842/4465) +0.3 (2842/4465)2
= 2.53
l/rT = 400 / 4.36 = 91.74
y
b F
/
xC
x
. 3
10
42
7171 = 84.68  91.74  y
b F
/
xC
x
. 6
10
85
35 =189.34
Fb = [2/3 – (Fy(l/rT)2
)/(1075.71x105
Cb)] Fy
Fb = 0.58x2530 = 1467 kg/cm2
Fb = (843.69 x 103
Cb) / (ld/Af) = 2738 kg/cm2
Fbmax = 1518 kg/cm2
fb =4465 x 100/547.32 = 815.8 < Fb (O.K.)
USAR W 12 x 26
3. PÓRTICO LONGITUDINAL
3.1 METRADO DE CARGAS
CARGAS DE SISMO

6. KVAERNER
ANIONIC PLOCCULANT
6
 Peso de estructura
 Cobertura (TR-4)
 S/C techo (al 25%)
= 30 kg/m2
= 10 “
= 25 “
Pq = 65 kg/m2
V = 0.20 x PT
PT = 65 x 14.0 x 4.0 = 3640 kg
V = 728 kg
CARGAS DE VIENTO
V = 84 MPH = 135 km/h
qs = 85 kg/m2
Ce = 1.06
I = 1.00
PAREDES O SUP. VERTICAL
 A barlovento : q = 90 x (0.80) = 72 kg/m2
 A sotavento : q = 90 x (-.050) = -45 kg/m2
EN LAS PAREDES
WBARLOVENTO = 72 x 4.0 = 288 kg/m
WSOTAVENTO = -45 x 4.0 = 180 kg/m
3.2 DIMENSIONAMIENTO
VIGA LONGITUDINAL
P = 364 kg
 Suponiendo W 6 X 12 A = 3.55 in2
= 22.90 cm2
rx = 2.49 in = 6.32 cm
KK/rx = 1.0 x 700 / 6.32 = 111
Fa = 811 kg/cm2
Pa = 22.90 x 811 = 18571 kg >> P (O.K.)
USAR W 6 x 12

7. KVAERNER
ANIONIC PLOCCULANT
7
DIAGONALES DE ARRIOSTRE
T = 450 kg
 Suponiendo 2L 3” X ¼” A = 2.88 in2
= 18.58 cm2
r = 0.93 in = 2.36 cm
Ta=1500 kg/cm²
Pa = 1500 x 18.58 = 27870 kg >> T (O.K.)
Esbelteces:
KK/rx = 1.0 x 700 / 4.33 = 161 < 200 (O.K.)
USAR 2L 3” x ¼”