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Diseño de una Armadura de Techo Tipo Howe
Dimensiones:
3m
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1.1.- Fuerza del Viento: Para nuestro caso tenemos una estructura inclinada la cual forma un ángulo α con la dirección del viento, entonces:
donde
w: carga sobre la superficie inclinada C: coeficiente de construcción = 1.2
q: Presión dinámica del viento a mas de 8 m = 80 Kg-f/m 2 donde
W: Carga por unidad de superficie superfic ie
donde
Fv
Fuerza vertical
donde
Fx
Fuerza vertical
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Calculando tenemos: w = C q sen (α ( α) = 1.2(80) sen(13.5) = 22.41 Kg/m 2 W = w A = 22.41 (771.2) = 178281 Kg Fv = W cos (α (α) = 178281 cos (13.5) = 16802 Kg Fx = W sen (α (α) = 178281 sen (13.5) = 4030 Kg 1.2.- Fuerza del Peso del Eternit: Peso del Eternit = 21.5 Kg Numero de planchas de eternit: Na = (Ancho total a techar/Longitud útil del eternit) = (25/1.64) = 16 N1 = (Largo total a techar/Ancho útil del eternit) = (60/0.875) = 69 Numero total de planchas de eternit es = 15 * 69 = 1040 aprox
Peso total del Eternit = 22360 Kg
1.3.- Fuerza de Sobrecarga: Se suele a usar según nuestras dimensiones de nuestra estructura una sobrecarga de 10 Kg/m2 por metro cuadrado de área de planta aproximadamente: Psc = 10 Kg/m2 (1500 m2) = 15000 Kg 1.4.- Fuerza del Peso de las Viguetas: Se asume un perfil determinado de vigueta y se busca su peso por unidad de longitud: Perfil Asumido: 2L 3” x 3 “x 3/16 Peso por unidad de longitud = 6 kg/m Total de Viguetas = 18 x 12 = 216 viguetas Peso Total de las Viguetas = 18 x (60m) x (6kg/m) = 6480 = 6480 kg Peso de la vigueta por m2 = 4.25 Kg/m2 1.4.- Fuerza del Peso del Tijeral: Se asume un perfil determinado para el tijeral y se busca su peso por unidad de longitud: Perfil Asumido: 2L 2.5” x 2.5 “ x 1/4 x 1/4
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F =(39.2 x 1542)/ 2*(13 -1) = 2505 Kg 2 F = 5010 Kg (Carga Kg (Carga total del Tijeral Intermedio) Ahora se reparte la fuerza sobre cada nudo del tijeral, considerando que sobre los nudos extremos actúa una fuerza Fn y sobre los nudos intermedios actúa una fuerza de 2 Fn. Nn = Numero de nudos = 16
1.5.- Fuerza Horizontal Total sobre el Techo: Fuerza Horizontal producida por el viento es:
Ahora se reparte la fuerza sobre cada nudo del tijeral, considerando que sobre los nudos extremos actúa una fuerza V y sobre los nudos intermedios actúa una fuerza de 2 V.
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Carga Total de viento horizontal = 4030 kg Carga de viento por tijeral = 310 kg Entonces: Entonces : 16 V = 310
V = 19.4 kg (Nudo Exterior ) 2V = 38.8 kg (Nudos Intermedios)
2.- Cargas o Fuerzas de la Estructura Metálica: 2.1.-Carga Muerta:
Es el peso de los materiales, dispositivos de servicio, equipos, tabiques y otros elementos soportados por la edificación, incluyendo su peso propio, que sean permanentes o con una variación en su magnitud, pequeña en el tiempo. Fuerza del Peso del Tijeral = Fuerza del Peso del Eternit =
Carga Muerta = 33850 kg
Fuerza del Peso de las Viguetas =
2.2.-Carga Viva:
Es el peso de todos los ocupantes, ocupantes, materiales, equipos, muebles y otros elementos movibles soportados por la edificación. Fuerza del Viento =
Fuerza de Sobrecarga =
3.- Tabla de Fuerzas en el Techo (Tijeral):
Carga Viva = 31802 kg
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a) Fuerzas Verticales:
BARRA
FUERZA(N)
BARRA
FUERZA(N)
AB
-94063.58 N
IV
16949.71 N
AR
93430.75 N
JK
-76579.3 N
BR
178.31 N
JV
-2749.20 N
BC
-101460.09 -101460.0 9 N
VW
82538.98 N
CR
-7761.88 N
VK
-13806.90 N
RS
108674.8 N
KL
-92590.0 N
CD
-105539.48 -105539.4 8 N
KW
13283.82 N
CS
-4226.84 N
LM
-92743.49N
DS
-3423.79 N
LW
-3277.98 N
ST
9728.48 N
MW
-9756.22 N
SE
8993.14 N
WY
97372.05 N
DE
-105655.40 -105655.4 0 N
MN
-106236.02 N
TU
82959.09 N
MY
8707.47 N
FT
-3375.53
NO
-106294.5 N
ET
-10044.32 N
NY
-3318.64 N
EF
-91971.0 N
YZ
107600.95 N
TG
13545.2 N
OY
-4014.04 N
FG
-92248.76 N
OP
-102919.27 N
GH
-76243.77 N
OZ
-8064.10 N
GU
-14076.84 N
PQ
-95963.37 N
HI
-76416.93
PZ
3637.49 N
HU
-2844.46 N
QZ
92218.14 N
IU
17698.47 N
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b) Fuerza Horizontal del Viento de Izqui erda a Derecha:
BARRA
FUERZA(N)
BARRA
FUERZA(N)
AB
-306.67 N
IV
-144.07 N
AR
-920.74 N
JK
650.92 N
BR
0N
JV
-23.37 N
BC
-306.67N
VW
701.58 N
CR
0N
VK
117.26 N
RS
-920.74 N
KL
-787.02 N
CD
0N
KW
112.91 N
CS
-306.67 N
LM
788.31 N
DS
-920.74 N
LW
-27.86 N
ST
0N
MW
82.93 N
SE
-306.67N
WY
827.66 N
DE
0N
MN
-903.0 N
TU
-920.74 N
MY
74.01 N
FT
0N
NO
903.450 N
ET
-306.67 N
NY
-282.05 N
EF
-920.74 N
YZ
914.61 N
TG
0N
OY
-34.12 N
FG
-306.67N
OP
874.82 N
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b) Fuerza Horizontal del Viento de Derecha a Izquierda:
BARRA
FUERZA(N)
BARRA
FUERZA(N)
AB
306.67 N
IV
-306.67 N
AR
920.74 N
JK
0N
BR
-65.16 N
JV
-306.67 N
BC
812.41N
VW
0N
CR
105.97 N
VK
306.67 N
RS
920.74 N
KL
0N
CD
829.09 N
KW
-306.67 N
CS
85.93 N
LM
0N
DS
79.10 N
LW
-306.67 N
ST
-32.69N
MW
0N
SE
26.44 N
WY
306.67 N
DE
838.08 N
MN
0N
TU
-605.15 N
MY
-306.67 N
FT
58.69 N
NO
0N
ET
35.38 N
NY
-306.67 N
EF
-631.75 N
YZ
0N
TG
75.13 N
OY
306.67 N
FG
704.11 N
OP
0N
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c) Fuerzas Vertical mas Fuerza del Viento de Derecha a Izquierda:
BARRA
FUERZA(N)
BARRA
FUERZA(N)
AB
-9263.58 N
IV
16049.71 N
AR
93330.75 N
JK
-76579.3 N
BR
246.31 N
JV
-2649.20 N
BC
-101360.09 -101360.0 9 N
VW
82538.98 N
CR
-7661.88 N
VK
-13706.90 N
RS
108574.8 N
KL
-92490.0 N
CD
-105439.48 -105439.4 8 N
KW
13183.82 N
CS
-4126.84 N
LM
-92643.49N
DS
-3323.79 N
LW
-3177.98 N
ST
9628.48 N
MW
-9656.22 N
SE
8993.14 N
WY
97272.05 N
DE
-105655.40 -105655.4 0 N
MN
-106136.02 N
TU
82959.09 N
MY
8607.47 N
FT
-3275.53
NO
-106194.5 N
ET
-10044.32 N
NY
-3218.64 N
EF
-91071.0 N
YZ
107400.95 N
TG
13445.2 N
OY
-4014.04 N
FG
-92148.76 N
OP
-102019.27 N
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d) Fuerzas Vertical mas Fuerza del Viento de Izquierda a Derecha:
BARRA
FUERZA(N)
BARRA
FUERZA(N)
AB
-94163.58 N
IV
17049.71 N
AR
93530.75 N
JK
-76779.3 N
BR
278.31 N
JV
-2849.20 N
BC
-101560.09 -101560.0 9 N
VW
82638.98 N
CR
-7861.88 N
VK
-13906.90 N
RS
108774.8 N
KL
-92690.0 N
CD
-105639.48 -105639.4 8 N
KW
13383.82 N
CS
-4326.84 N
LM
-92843.49N
DS
-3523.79 N
LW
-3377.98 N
ST
9828.48 N
MW
-9856.22 N
SE
9093.14 N
WY
97472.05 N
DE
-105755.40 -105755.4 0 N
MN
-106336.02 N
TU
83059.09 N
MY
8807.47 N
FT
-3475.53
NO
-106394.5 N
ET
-10144.32 N
NY
-3418.64 N
EF
-92071.0 N
YZ
107700.95 N
TG
13645.2 N
OY
-4114.04 N
FG
-92348.76 N
OP
-103019.27 N
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Como vemos en el caso d encontramos las barras mas criticas, donde tomaremos las de mayor magnitud a tracción i compresión. 4.- Barras Críticas: 4.1.-Para Barras del Cordón Cordón Superior e Inferior (Barras de de color rojo): Barra RS = 108 774.8 N
a Tracción
Barra NO = - 106394.4 N
a Compresión
4.2.-Para Barras Montantes (Barras de color azul): Barra DS = - 3 523.79 N a Compresión 4.3.-Para Barras Diagonales Diagonales (Barras (Barras de color verde): Barra IU = 17 598.47 N
a Tracción
Barra GU = - 14 276.84 N a Compresión
5.- Calculo de Tracción y Pandeo de las Barras Críticas: Material Acero ASM – ASM – A36 A36 Nsf = 1.4 (Factor de Seguridad) Sy = 36 lb/pulg 2 E = 29 000 lb/pulg 2 a) Cordón Superior e Inferior: Perfil asumido 2L 2.5” x 2.5” x ¼ Datos: A0 = 1.19 pulg2 Io = 0.703 pulg
4
x = y = 0.717 pulg
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Entonces:
Pandeo: (Barras Pandeo: (Barras articuladas en ambos extremos NO = - 106 394.4 N = 23 860.11 lb = P t