DISEÑO DE ZAPATAS COMBINADAS INTRODUCCION DE ANALISIS En la seccion Longitudinal trabaja como una viga invertida soportando el empuje del terreno. Forma de trabajo: Si la zapata es muy flexible (poco canto) puede ocurrir que pandee. para evitar dicho pandeo tendremos dos opciones: aumentar el canto de la zapata. Colocar un nervio rigidizador uniendo los pilares, con lo cual evitaremos el posible pandeo.
Nota: En principio las zapatas aisladas sacan provecho de que diferentes pilares tienen diferentes momentos flectores. Si estos se combinan en un unico elemento de cimentacion, el resultado puede ser un elemento mas estabili zado y sometido sometido a un menor momento resultante.
FORMA DE TRABAJO DE LAS ZAPATAS COMBINADAS
Nota: Las cargas obtenidas son las que inbolucran al portico y que se encuentra en su area de fluencia de carga. Cabe mencionar para este tipo de zapata, requiere de una cimentación previa para evitar deformaciones por diferencia de cargas en cada elemento. Para este tipo de analisi s se requiere el nivel de fundacion por el laboratorio de suelos, y el tipo de concreto a utilizar y el acero de fluencia sin olvidada la sobre carga carga por edificación.
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ZAPATA DATOS AREA TRIBUTARIA b = Viga Principal d = Viga Principal h L = Viga Principal b = Viga Secundaria d = Viga Secundaria h L = Viga Secundaria B = Columna (lado menor) A = Columna (lado mayor) 1 h = Columna CAligerado e = 0.20 m A NPiso Terminado MPeso Tabiqueria U LPeso Concreto O CCarga Viva
1er. Piso
EXTERIOR ( Esquina ) 2do Piso 3er Piso
4.10 m² 0.30 m 0.60 m 1.23 m 0.30 m 0.50 m 1.45 m 0.30 m 1.10 m 3.00 m 300.00 kgf/m² 100.00 kgf/m² 150.00 kgf/m² 2,400.00 kgf/m² 300.00 kgf/m²
4.10 m² 0.30 m 0.60 m 1.23 m 0.30 m 0.50 m 1.45 m 0.30 m 1.10 m 3.00 m 300.00 kgf/m² 100.00 kgf/m² 150.00 kgf/m² 2,400.00 kgf/m² 300.00 kgf/m²
4.10 m² 0.30 m 0.60 m 1.23 m 0.30 m 0.50 m 1.45 m 0.30 m 1.10 m 3.00 m 300.00 kgf/m² 100.00 kgf/m² 150.00 kgf/m² 2,400.00 kgf/m² 150.00 kgf/m²
1er. Piso
2do Piso
3er Piso
Wu = 1.4 x WD +1.7 x WL
531.4 522.0 2,376.00 1,230.00 410.0 615.00 5.684 1.23 6.91 10.05
531.36 522.00 2,376.00 1,230.00 410.00 615.00 5. 684 1.23 6.91 10.05
ZAPATA DATOS
1er. Piso
METRADO DE CARGAS Peso Propio Vigas Principal Peso Propio Vigas Secundaria Peso Propio Columna Peso Aligerado Piso Terminado Peso de Tabiqueria
WD WL WT
AREA TRIBUTARIA b = Viga Principal d = Viga Principal h L = Viga Principal ) b = Viga Secundaria a d = Viga Secundaria h n mL = Viga Secundaria u l o B = Columna (lado menor) C o A = Columna (lado mayor) m o c h = Columna a 0.20 m r Aligerado e = a z Piso Terminado i l a Peso Tabiqueria n APeso Concreto e S ( Carga Viva 1 METRADO DE CARGAS P Peso Propio Vigas Principal A CPeso Propio Vigas Secundaria A LPeso Propio Columna P Peso Aligerado Piso Terminado Peso de Tabiqueria
7.55 m² 0.30 m 0.60 m 2.45 m 0.00 m 0.00 m 0.00 m 0.30 m 1.10 m 3.00 m 300. 300.00 00 kgf kgf/m² /m² 100. 100.00 00 kgf kgf/m² /m² 150. 150.00 00 kgf kgf/m² /m² 2,400 2,400.00 .00 kgf kgf/m /m²² 300. 300.00 00 kgf kgf/m² /m²
531.36 522.00 2,376.00 1,230.00 410.00 615.00 5.684 0.62 6.30 9.00
∑ de
los Pisos
1.59 Ton 1.57 Ton 7.13 Ton 3.69 Ton 1.23 Ton 1.85 Ton
17.05 Ton 3.08 Ton 20.13 Ton 29.10 Ton
INTERIOR ( Central ) 2do Piso 3er Piso 7.55 m² 0. 30 m 0. 60 m 2. 45 m 0. 00 m 0. 00 m 0. 00 m 0. 30 m 1. 10 m 3. 00 m 300 300.00 .00 kgf kgf/m² /m² 100 100.00 .00 kgf kgf/m² /m² 150 150.00 .00 kgf kgf/m² /m² 2,400 2,400.00 .00 kgf kgf/m /m²² 300 300.00 .00 kgf kgf/m² /m²
1er. Piso
2do Piso
1058.4 0.0 2,376.00 2,265.00 755.0 1132.50
1,058.40 0.00 2,376.00 2,265.00 755.00 1,132.50
7.55 m² 0.30 m 0.60 m 2.45 m 0.00 m 0.00 m 0.00 m 0.30 m 1.10 m 3.00 m 300.00 kgf/m² 100.00 kgf/m² 150.00 kgf/m² 2,400.00 kgf/m² 150.00 kgf/m²
3er Piso 1,058.40 0.00 2,376.00 2,265.00 755.00 1,132.50
∑ de
los Pisos
3.18 Ton 0.00 Ton 7.13 Ton 6.80 Ton 2.27 Ton 3.40 Ton
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CALCULO DE DIMENSIONES DE ZAPATA COLUM NA C- 1
PD1 = PD2 = PT1 = t1 = t'1 =
( EJE I -I Entre EJES 1 y 2 )
PLACA P - 1
t2 t'2 E fcs
20.13Ton 28.42Ton 48.55Ton 0.70 m 0.30 m
= = = =
1.10 0.30 217370.65 kgf/cm² 2,300 kgf/cm²
f'c fy fc hf S/c
= = = = =
210 kgf/cm² 4,200 kgf/cm² 2,400 kgf/cm² 1.40 m 400 kgf/m²
Ln qau
2.45 m = = 14.35Ton/m² γp 1.12 kgf/cm² = Resistencia del Terreno
C-1
P-1
2. 4 5
Resistencia Neta del Terreno σn
=
qau
σn
=
14.35Ton
σn
=
10.98Ton/m²
f'c
-
x
2.10 Tn
-
x
Df
-
S/c
-
1.40 m
-
0.40 Tn
-
γp 0.23 Ton/m³
x
0.15 m
Calculo Area Zapata: Az Az =
PT1
48.55Ton 10.98Ton/m²
=
σn
Distancia de cara ext. Col. A punto aplicac. Result. t1 PD2 = PD1 x + x ( 2 PD2 20.13Ton R = PD1 + =
RX0
R
=
48.55Ton X0
t1
=
+
Ln
+
+
4.42 m²
t2 2
28.42Ton
48.55Ton x =
X0
+
20. 13Ton
112.20Ton/m 48.55Ton
=
0.70 m + 2 2.31 m x
28.42Ton
x(
0.70 m
2.45 m
+
1.10 m ) 2
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2.45 m 28.42Ton
20.13Ton
2.31 m
2.31 m 4.62 m
Determinando la Longitud de Zapata X0 Lz = 2 x
Lz
=
4.62 m
2.31 m =
2x
Lz Longit ngitud ud de Zap Zapata ata Adopt doptad ado o
Lv
= Lz -
(
Lv ala o volado Lv = 4.70 m -
t1 +
(
4.70 m
= Ln +
t2 )
0.70 m +
2.45 m +
1.10 m
0.45 m
=
Ancho de Zapata
bz
=
Az = Lz Ancho ncho de Zapa Zapata ta ado adoptad ptado o
=
4.42m² = 4.70 m 1.00 m
Usar:
0.94 m
1.00 m
bz
Ancho de la Zapata Obtenido
Reacción neta por unidad de longitud sera: P1u =
29.10 Ton
P2u =
41.49 Ton
PTn =
70.59 Ton
wNu =
P1u
P2u
+ Lz
29.10Ton
=
+ 4.70 m
41.49Ton
=
15.02Ton/m
Reacción neta por unidad de area: Wnu =
wNu bz
=
15.02Ton/m 1.00 m
=
41.49Ton
wNu 15.0Ton/m
15.02Ton/m²
=
1.50 kg/cm²
29.10Ton
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Diseño en el Senti do Longitudinal Vz
=
0
=
P1u
-
wNu
+
P1u wNu
X0 =
Mmax =
x(
X0
=
-
0
29. 10Ton 15.0Ton/m
X0^² ) 2
15.02Ton x (
Mmax =
x
=
wNu
Mmax =
Vz = 0 cortante cero, momento maximo
P1u
-
1. 94 m ) 2
1.94 m
=
(
X0
29.10 m
-
t1 t1 2
)
1.94Ton/m
(
-
0.90 0.0036 0.075
Ø = Coeficiente ρ cuantia adoptada = Recubrimiento = Mu = Ø x Mmax 18.01Ton/m
f 'c x =
bz d²
x
0.9
x
d
Formula de cuantia
Adimensional Adimensional
ω
(
1
-
210 kgf/cm² x
ω
x
ρ
fy
f'c
0. 5 9
x
100 x
ω
)
d²
x
ω
0.072
0.072
1-
Adimensional
0.59
x
0.37 m
=
d Nuev uevo pera peralt ltee de zapat apataa hz =
)
-18.01Ton/m
Dimensionamiento de la altura hz de la zapata :
d
0.70 m 2
+
=
r (recubrimiento)
+
Considerar el refuerzo de la columna un : hz =
0.37 m
hz =
0.48 m
0.075 m
+ =
+
Usar :
Diametro del fierro/100 1.98 cm²
Ø 5/8" = 1.50
hz =
x
1.98 cm²
0.50 m
…………. Altura de la Zapata adoptado
Nuevo Peralte de Zapata d=
hz
d=
0.40 m
- (
r
+
1.50
*
Diametro del fierro/100 )
……………………………………………………………
Nueva altura de Zapata adoptado
0.072 )
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VERIFICACION VERIFICACION POR PO R CORTE P1u
Vd = Vd =
wNu
+
29.10 Ton +
t1 2
1 =
+
15.02Ton/m
0.70 m + 2
Vd1
=
Vd
Vd1
=
23.84 Ton
Vd
0.40 m
wNu
-
23.84 Ton
Vd =
t2 2
2 =
+
Vd2
=
Vd2
=
Vd
t2 2
3 =
0.40 m
=
0.95 m
-
wNu
x
y2
26. 47 Ton -
+
15.02Ton/m x
+
0. 40 m
Vd3
= w wN Nu
x
t2
Vd3
=
Vu =
Vd1
+
=
Vu Ø
Vc
= =
Vc
>
x
Vd2
+
26.47 Ton
1. 1 0 2
2. 2.45 m +
………………………
Distancia de corte de columna int. 2 hacia interior
12.20 Ton
0.95 m =
+ Lv Lv
-
3
1. 1 0 2
+
0.45 m -
0.53 √
Distancia de corte de columna int. 2 hacia exterior
0.75 Ton
0.95 m =
→
12.58 Ton
=
………… ……………… ………… ………… ………… ………… ………… ……… … =
bz
f'c x
210 kgf/cm² x
Vu
0.75 Ton
+
12.58 Ton 0.85
→
x
………………………
Vd3
0.85
0. 53
0.95 m
=
12.20 Ton
+
Ø
Coeficiente :
Vc
2
15.02Ton/m
12.58 Ton
Vu =
………… ………… Col Col 2 (co (cortan rtante te en e e colum columna na 2
d
1. 1 0 2
y3 =
t2 ) 2
0.70 m + 2
+
12.58 Ton
0.75 m =
t1 + Ln + 2
d
1.10 2
y2 =
x
15.02Ton/m (
-
Distancia de corte de columna exterior 1
y1
x
(
Col 1 (cortante en eje columna 1)
………………………
15.02Ton/m
-
wNu
-
0.75 m
=
23.84 Ton
0.70 m = 2
x
d
y1 =
Vd =
t1 2
x
x
d
0.40 m x
30.72 Ton
>
Valor maximo
Adimen dimensio siona nal. l.
14.80
>
Vu
1. 1 . 00 m =
30.72 Ton
12.58 Ton
OK
12.20 Ton 0.95 m
0.75 m 0.95 m
0.75 Ton
12.58 Ton
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DISEÑO POR PUNZONAMIENTO PUNZONAMIENTO Este tipo de zapatas se comporta en las dos direcciones, con una sección critica perpendicular al plano de la losa y localizada de tal forma que su perimetro b0 sea minimo pero ala vez necesita d/2 del perimetro del area de la columna. C A d + 0 3 . 0 = 2 P
b = 1.00 m
d + 0 3 . 0 = 1 P
P2 =
Pun Punzonamie amieto to en la zapat apata: a: Columna Exterior
Vu
1.10 + d =
Ø
≤
0.53 + 1.1 Vc = ( ) x o t n ßc e i 0 . m 7 a 0 n o z d n u + P 0 a . r 3 a 0 p = l a 2 s 4.40 m b0 = r P e v s n 1.50 P2 = 1.10 + d = a r Lado lon itudinal aarra Punzonamiento T o d a L
√
Vn f' c
x
b0
x
Ø
=
-
wnu
x
B
x
C
f' c x
b0 x
B
d
≤
0.85
√
1.10 x
d 0 7 . 0
t1 C- 1
2.50 m
b0 =
d + 0 . 1 3 ' t 0 = 1 P
P1 .70 + d / 2= 0.90 Lado lon itudinal aarra Punzonamiento
d/2
P1u
.70 + d / 2=
L
d/2
Vu =
P1 =
o t n e i m a n o z n u P a r a p l a s r e v s n a r T o d a L
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Vc
Vc1
=
0.27 x
(
2
Vc1
=
1.00 Ton
x
√
Vc1
=
144.91 Ton
Vc2
=
1.10 x
Vc2
=
1. 10
Vc2
=
159.41 Ton
4 ) x ßc
√
210 kgf/cm²
x
f'c
x
bo x
d
210 kgf/cm²
x
2.50
x
+
√
√
x
f'c
x 2.50
bo
x
d
0.40
X
0.40 No Mayor que …………..1
Comparación con formula formula de Zapatas por punzonamiento(zapata aisla da) Vc =
0. 85
Vc =
1.2 Ton
0.53
[(
Vc1 Vn
<=
145 Ton
=
1.10 2.33
+
)
x
23 Ton
>
210 kgf/cm²
144.91 Ton
→
Vc2
√
=
250.00 cm x bo
x
Vc
0.40 cm hz
Resistente
OK
Columna Interior Vu =
P2u
-
wnu
41.49 Ton
Vu =
B
0.85
Vu Ø
x
C
15.02Ton/m²
-
Ø
Coeficiente : =
x
25.72 Ton 0.85
→
ßc
ßc
3.67
t2 t'2
1. 10 m 0. 30 m
=
Vc =
0. 27
x (
Vc =
0. 27
x (
2. 0 0
0.70 m
x
………… ……………… ………… ………… ………… ………… ………… ……… …
Relación de d e la sección de la columna. =
1.50 m
x
=
+
2.00 m +
4 ) ßc 4 3.67
)
=
4 ) x ßc
√
210 kgf/cm²
x
Adimen dimensio siona nal. l.
30.26 Ton
=
=
Dmayor Dmenor ………………………. .
Adimensional.
0.83 Ton
Vc
Vc1
=
0.27 x
(
2
Vc1
=
0.83 Ton
x
√
Vc1
211.69 Ton
+
=
f'c
x 4. 4 0
bo X
x 0.40
d
25.72 Ton
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DISEÑO POR FLEXION EN LA DIRECCION LONGITUDINAL LONGITUDINAL Refuerzo Superior Mmax = a= d Ln As
18.01Ton/m
= Ø
As
0. 4 0 2.45
=
=
fy
x
0. 16 cm
=
Mu ( d -
→
5.48 cm
0. 9 0
x
=
a ) 2
Asumido por calculo
18.01Ton/m 4,200 kgf/cm² x 0.40 m
-
5.48 cm ) 2
12.79 cm²
Comprobando con con formula de Asmax (Refuerzo pri ncipal)…………………………………………… ncipal)………………………………………………1 …1
As
=
Mu ( kg - m ) d (cm) 33 x Ø
Coeficiente
a
=
As Ø x
0.85
=
x
18.010 (Kgf -m) 33 40 cm x
=
13.64 cm²
Adimensional
fy
f' c x
=
=
bz
12.79 cm² x 2 1 0 k g f / c m² 0. 8 5 x
4,200 kgf/cm² 1.00 m x
=
3.01 cm
Articulo:7 - 7.10. Refuerzo por Contracción Contracción y Temperatura. Losas donde se usan barras corrugadas corrugadas o malla de alambre que tengan 0.0018 intersecciones soldadas, soldadas, con lim ites de esfuerzo de fluencia de 4200 kg / cm². ρ = Adimensional
As min.
=
As min.
=
x
ρ
bz x
0.0018
d 1. 00 m x
x
0.40 m =
7.20 cm²
Comprobando con con formula de Asmin ( Refuerzo Secundario)………………….…………………………..2 Secundario)………………….…………………………..2
Asminimo =
As
>
Considerando
n =
bz
100.00 m
x d = 414
→
As min Ø
Area de Acero Area de Barra
5/8" =
Detalle de distribución de barras
=
x 414
12.79 cm² 1.59 cm 12.79 cm² 1.98 cm²
40.00 m
=
9.66 cm²
……………………………. Adoptado para ánalisis
→
1.98 cm² =
7
Ø
5/8" (
13.86 cm²
)
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Refuerzo inferior Mu
= wNu
x
Lv ² 2
Mu max
=
1.52Ton/m
a= d Ln
=
0. 4 0 2.45
As
As
x
x
0.45 m
1.52 Ton-m
=
2
0. 16 cm
=
Mu fy ( d -
= Ø
15.02Ton/m
=
→
5.48 cm
1.52Ton/m 4, 200 kgf/cm² x
=
a ) 2
Asumido por calculo
0. 9 0 x
0.40 m
-
5.48 cm ) 2
1.08 cm²
=
Comprobando con con formula de Asmax (Refuerzo pri ncipal)…………………………………………… ncipal)………………………………………………1 …1
As
=
Mu ( kg - m ) d (cm) 33 x Ø
Coeficiente
a
=
As Ø x
1.521 (Kgf -m) 33 40 cm x
0.85
=
x
=
1.15 cm²
Adimensional
fy
f' c x
=
=
bz
1.08 cm² x 0.85 x 210 kgf/cm²
4,200 kgf/cm² 1.00 m x
=
0.25 cm
Articulo:7 - 7.10. Refuerzo por Contracción Contracción y Temperatura. Losas donde se usan barras corrugadas corrugadas o malla de alambre que tengan 0.0018 intersecciones soldadas, soldadas, con lim ites de esfuerzo de fluencia de 4200 kg / cm². ρ = Adimensional
As min.
=
As min.
=
x
ρ
bz x
0.0018
d 1. 00 m x
x
0.40 m =
7.20 cm²
Comprobando con con formula de Asmin ( Refuerzo Secundario)………………….…………………………..2 Secundario)………………….…………………………..2
Asminimo =
As
>
Considerando
n =
bz
100. 0 m
x d = 414
→
As min Ø
5/8"
Area de Acero Area de Barra
=
Detalle de distribución de barras
Ø
5/8"
=
x 414
7.20 cm² 1.59 cm 7.20 cm² 1.98 cm²
40.00 m
=
9.66 cm²
……………………………. Adoptado para ánalisis
→
1.98 cm² =
4
Ø
5/8" (
7.92 cm²
)
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DISEÑO POR FLEXION EN LA DIRECCION TRANSVERSAL
150.0 cm
b2 b1
=
t1 +
d 2
b2
=
t2 +
d
= =
b1=
70.0 cm
+
40.0 cm 2
=
90.0 cm
110. 0 cm
+
40.0 cm
=
150.0 cm
90.0 cm
Diseño de la Viga Exterior qNU = Lvt
p1u bz bz
=
29.10Ton 1.00 m
=
- t'1
29.10 Ton/m
=
1.00 m
=
Mu máx =
0.30 m
-
2
0.35 m
=
2
qNU x
Lvt
x
Lvt 2
5/8"
=
1.59 cm
29.1 Ton/m
=
x
0.35 m
x
0.35 m 2
=
1.78 Ton-m
Nuevo Peralte de Zapata Ø
Considerando d=
hz
d=
0.50 m
d=
0.42 m
- (
Ø
Coeficiente
a= d Ln As
-
r
+
0.075
0.90
=
= Ø
x
/
1.98 cm²
2)
1.59 cm ) 2 …………………………………………………………… (
0.42 2.45
=
Diametro fierro
→
fy
+
Nueva altura de Zapata adoptado
Adimensional =
Mu ( d
0.17 cm
→
=
a )
0 90 x
5.48 cm
Asumido por calculo
1.78Ton/m 4,200 kgf/cm² x
0 42 m
5 48 cm )
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Articulo:7 - 7.10. Refuerzo por Contracción Contracción y Temperatura. Losas donde se usan barras corrugadas corrugadas o malla de alambre que tengan 0.0018 intersecciones soldadas, soldadas, con lim ites de esfuerzo de fluencia de 4200 kg / cm². ρ = Adimensional
As min.
=
As min.
=
x
ρ
bz x
0.0018
d 0. 90 m x
x
0.42 m =
6.76 cm²
Comprobando con con formula de Asmin ( Refuerzo Secundario)………………….…………………………..2 Secundario)………………….…………………………..2
Asminimo = As
>
bz
n =
→
As min
Considerando
90.00 m
x d = 414
Ø
5/8"
Area de Acero Area de Barra
=
41.71 m
x 414
6.76 cm²
……………………………. Adoptado para ánalisis
→
1.59 cm
1.98 cm²
6.76 cm² 1.98 cm²
=
9.07 cm²
=
4
=
Ø
5/8" (
7.92 cm²
Detalle de distribución de barras
S = S
=
5/8"
Ø
Considerar :
Lado (b1) 0.90 m
2x n
-
=
Recubrimiento 1 0.075
2x 4
→
1.59 cm
-
Diametro
1.59 cm
=
0.24 m
1
-
Distribucion de barras colocadas:
- Ø
1.98 cm²
→
4 Ø 5/8"
@
0.24 m
REFUERZO POR MONTAJE S
=
36 x Ø
=
36
Detalle de distribución de barras
x
1.59 cm
=
0.57 m ……………………. Diametro de Barra Colocada
)
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Diseño de la Viga Interior qNU =
Lvt
P2u bz bz
=
41.49Ton 1.00 m
=
- t'2
41.49 Ton/m
=
1.00 m
=
Mu máx =
0.30 m
-
2
0.35 m
=
2
qNU x
Lvt
x
Lvt 2
5 / 8"
=
1.59 cm
41.5 Ton/m
=
0.35 m
x
x
0.35 m 2
=
2.54 Ton-m
Nuevo Peralte de Zapata Ø
Considerando d=
hz
d=
0.50 m
d=
0.42 m
- (
Ø
Coeficiente
a= d Ln As
+
0.075
/
1.98 cm²
2)
1.59 cm ) 2 …………………………………………………………… (
+
0.90
=
=
=
Diametro fierro
0. 4 2 2.45
=
Ø
As
-
r
→
x
Nueva altura de Zapata adoptado
Adimensional =
Mu fy ( d -
0. 17 cm
→
5.48 cm
2.54Ton/m 4,200 kgf/cm² x
=
a ) 2
Asumido por calculo
0. 9 0 x
0.42 m
1.73 cm²
Comprobando con con formula de Asmax (Refuerzo pri ncipal)…………………………………………… ncipal)………………………………………………1 …1
As
=
Mu ( kg - m )
=
2.541 (Kgf -m)
=
1.85 cm²
-
5.48 cm ) 2
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Detalle de distribución de barras
S =
S
=
5 / 8"
Ø
Considerar :
Lado (b2) -
2x n
1.50 m
2x
6
=
→
1.59 cm
Recubrimiento 1 0. 0 7 5
Diametro
1.59 cm
-
0.27 m
=
1
-
Distribucion de barras colocadas:
- Ø
1.98 cm²
→
6 Ø 5/8"
0.27 m
@
REFUERZO POR MONTAJE S
=
36 x Ø
36
=
1.59 cm
x
=
0.57 m ……………………. Diametro de Barra Colocada
Detalle de distribución de barras
S =
S
=
3 / 8"
Ø
Considerar :
Lado (bz) -
1.00 m
2x n
-
=
Recubrimiento 1 0. 0 7 5
2x 6
→
0.95 cm
-
Diametro
0.95 cm
=
0.17 m
1
-
Distribucion de barras colocadas:
- Ø
0.71 cm²
→
6 Ø 3/8" 41.49Ton
@ P1u
0.17 m
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m 7 2 . 0
m 0 0 . 1
m 5 3 . 0
= z b
t v L
@ " 8 / 5
m 0 5 . 0
= f h
= z h
5 2 . 0 -
Ø 6
O T E R C N O C E D S A R U T C U R T S E E D O Ñ m
m 0 4 . 1
0 5 . 1
m 5 4 . 0
R O I R E T N I A G I V
0 3 . 0
0 7 . 4
5 0
A D A N I B M O C N O I C A T N E M I C E D A T N
0 0 . 0
m 0 9 . 0
= N T N
= T Z N
2 A G I V
0 1 . 1
m 8 2 . 0 @
r o i r e p u S . g n
m 4 1 . 0 @
" 8 / 5 Ø 4
r o i r e f
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DISEÑO DE ZAPATAS COMBINADAS :( Volado de corredor) ZAPATA DATOS b = Viga Principal d = Viga Principal h L = Viga Principal b = Viga Secundaria d = Viga Secundaria h L = Viga Secundaria B = Columna (lado menor) A = Columna (lado mayor) 1 h = Columna 0.20 m CAligerado e = APiso Terminado N MPeso Tabiqueria UPeso Concreto L OCarga Viva C
METRADO DE CARGAS
Peso Propio Vigas Principal Peso Propio Vigas Secundaria Peso Propio Columna Peso Aligerado Piso Terminado Peso de Tabiqueria
WD WL WT Wu = 1.4 x WD +1.7 x WL
1er. Piso
EXTERIOR ( Esquina ) 2do Piso 3er Piso
8.67 m² 0.30 m 0.60 m 1.23 m 0.30 m 0.50 m 2.15 m 0.30 m 1.10 m 3.00 m 300. 300.00 00 kgf kgf/m² /m² 100. 100.00 00 kgf kgf/m² /m² 150. 150.00 00 kgf kgf/m² /m² 2,400 2,400.00 .00 kgf kgf/m /m²² 300. 300.00 00 kgf kgf/m² /m²
8.67 m² 0. 30 m 0. 60 m 1. 23 m 0. 30 m 0. 50 m 2. 15 m 0. 30 m 1. 10 m 3. 00 m 300 300.00 .00 kgf kgf/m² /m² 100 100.00 .00 kgf kgf/m² /m² 150 150.00 .00 kgf kgf/m² /m² 2,400 2,400.00 .00 kgf kgf/m /m²² 300 300.00 .00 kgf kgf/m² /m²
8.67 m² 0.30 m 0.60 m 1.23 m 0.30 m 0.50 m 2.15 m 0.30 m 1.10 m 3.00 m 300.00 kgf/m² 100.00 kgf/m² 150.00 kgf/m² 2,400.00 kgf/m² 150.00 kgf/m²
1er. Piso
2do Piso
3er Piso
531.4 774.0 2,376.00 2,600.88 867.0 1300.44 8.450 2.60 11.05 1 6. 2 5
531.36 774.00 2,376.00 2,600.88 866.96 1,300.44 8. 450 2. 6 0 11.05 16.25
531.36 774.00 2,376.00 2,600.88 866.96 1,300.44 8.450 1. 3 0 9. 7 5 14.04
ZAPATA DATOS
1er. Piso
AREA TRIBUTARIA b = Viga Principal
22. 82 m² 0 30 m
INTERIOR ( Central ) 2do Piso 3er Piso 22.82 m² 0 30 m
22.82 m² 0.30 m
∑ de
los Pisos
1.59 Ton 2.32 Ton 7.13 Ton 7.80 Ton 2.60 Ton 3.90 Ton
25.35 Ton 6.50 Ton 31.85 Ton 46.54 Ton
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CALCULO DE DIMENSIONES DE ZAPATA COLUM NA C- 1
PD1 = 31.85Ton PD2 = 72.65Ton PT1 = 104.50Ton 0 . 70 m t1 = 0.30 m t'1 =
( Zona critica voladizo eje 2-2 )
COLUMNA C-2
t2 t'2 E
= = =
C -2
1. 0 0 0. 3 0 217370. 65 kgf/cm²
f'c fy fc hf S/c
= = = = =
210 kgf/cm² 4,200 kgf/cm² 2,400 kgf/cm² 1 . 40 m 400 kgf/m²
Ln qau
2.90 m = = 14.35Ton/m² γp 1.12 kgf/cm² = Resistencia del Terreno
C-1
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2.90 m 72.65Ton
31.85Ton
2.96 m
2.96 m 5.91 m
Determinando la Longitud de Zapata X0 Lz = 2 x
Lz
=
2x
2.96 m =
Lz Longit ngitud ud de Zap Zapata ata Adopt doptad ado o
Lv
= Lz -
(
t1 +
5.91 m 6.00 m
= Ln +
t2 )
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Diseño en el Senti do Longitudinal Vz
=
0
=
X0 =
Mmax = Mmax = Mmax =
P1u
-
Vz = 0 cortante cero, momento maximo wNu
+
P1u wNu
x
x(
-
^² 2
25.57Ton x (
=
-
0
46. 54Ton 25.6Ton/m
=
wNu
X0
P1u
1. 82 m ) 2
(
46. 54 m
1. 82 m
= X0
-
t1 2
1.82Ton/m
(
-
)
-26. 08Ton/m
Dimensiona Dimensionamiento miento de la altura hz de la za ata : Ø = Coeficiente ρ cuantia adoptada = Recubrimiento = Mu = Ø x Mmax 26 08Ton/m
0.70 m
0.90 0. 0036 0.075
f 'c x
bz d²
x
=
09
x
Formula de cuantia
Adimensional Adimensional
ω
(
1
-
210 kgf/cm² x
0. 5 9 160 x
ω
x
ρ
f
f'c
x
ω
0.072
0 07 2
1-
Adimensional
ω
d²
x
0 59
x
0 072 )
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VERIFICACION VERIFICACION POR PO R CORTE P1u
Vd =
Vd =
wNu
+
46.54 Ton +
t1 2
y1 =
+
25.57Ton/m
0. 70 m + 2
Vd1
=
Vd
Vd1
=
37.59 Ton
Vd =
Vd
x
37.59 Ton
0.70 m = 2
Col 1 (cortante en eje columna 1)
d
y1 =
Vd =
t1 2
x
0. 40 m
wNu
-
-
37.59 Ton
=
-
wNu
-
0.75 m
Distancia de corte de columna exterior 1
y1
x 25.57Ton/m
(
………………………
x
t1 + Ln + 2
25.57Ton/m (
18.42 Ton
0. 75 m =
t2 ) 2
0.70 m + 2
………… ………… Col Col 2 (cortant (cortantee en eje colum columna na 2)
2.90 m +
1. 0 0 2
)
58.28 Ton
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35.27 Ton 0.90 m
0.75 m 0.90 m
25.57 Ton
18. 42 Ton
DISEÑO POR PUNZONAMIENTO PUNZONAMIENTO Este tipo de zapatas se comporta en las dos direcciones, con una sección critica perpendicular al plano de la losa y localizada de tal forma que su perimetro b0 sea minimo pero ala vez necesita d/2 del perimetro del area de la columna. C A
b = 1.60 m
d + 0 3 . 0 =
d + 0 3 . 0 =
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Vu = Vu =
P1u
-
46.54 Ton
Ø
Coeficiente : =
wnu
Vu Ø
x
B
x
15.98Ton/m²
0.85
C
36.47 Ton 0.85
→
ßc
ß
2 33
0 70
x
………… ……………… ………… ………… ………… ………… ………… ……… …
Relación de d e la sección de la columna. t1
0.90 m
x
=
=
0. 70 m
=
Adimen dimensio siona nal. l.
42.91 Ton
Dmayor Dmenor Adi
i
l
36.47 Ton
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Vc =
0. 27
x (
Vc =
0. 27
x (
2. 0 0
+
4 ) ßc 4 3.33
2.00 m +
0.86 Ton
)
=
4 ) x ßc
√
210 kgf/cm²
x
f'c
bo x
Vc
Vc1
=
0.27 x
(
2
Vc1
=
0.86 Ton
x
√
Vc1
=
209.37 Ton
Vc2
=
1.10 x
√
+
x
f'c
x 4.20
d
bo X
x
d
0.40
No Mayor que …………..1
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Considerando
n =
Ø
5 / 8"
Area de Acero Area de Barra
=
=
1.59 cm
→
18.52 cm² 1.98 cm²
1.98 cm² =
10
Detalle de distribución de barras Considerar :
S =
S
Lado (bz) -
1.60 m
Ø
5/8"
2x n 2
Recubrimiento 1 0 075
- Ø
1 59
Diametro 0.16 m
Ø
5/8" (
19.80 cm²
)
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n =
Area de Acero Area de Barra
17.79 cm² 1.98 cm²
=
9
=
Detalle de distribución de barras
S =
S
=
5/8"
Ø
Considerar :
Lado (bz) -
2x n
1.60 m
2x
9
Recubrimiento 1 0. 0 7 5 -
Distribucion de barras colocadas:
- Ø
-
Diametro
1.59 cm
=
0.18 m
1
9 Ø 5/8"
@
0.18 m
Ø
5/8" (
17.82 cm²
)
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a= d Ln As
= Ø
As
0. 4 2 2.90
=
=
x
=
Mu fy ( d -
0. 14 cm
→
5.48 cm
6.14Ton/m 4, 200 kgf/cm² x
=
a ) 2
Asumido por calculo
0. 9 0 x
0.42 m
4.17 cm²
Comprobando con con formula de Asmax (Refuerzo pri ncipal)…………………………………………… ncipal)………………………………………………1 …1
As
=
Mu ( kg - m ) d (cm) 33
=
6.145 (Kgf -m) 33 42
=
4.46 cm²
-
5.48 cm ) 2
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1 60
00 5
0 95
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Coeficiente
Ø
=
0.85
Adimensional
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m
m