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LOSAS
ALIGERADAS
LOSAS
ALIGERADAS
LOSAS
ALIGERADAS
LOSAS ALIGERADAS
LOSAS ALIGERADAS
LOSAS ALIGERADAS
LOSAS ALIGERADAS
VIGUETA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
METRADO DE CARGAS
CARGA MUERTA (D)
p.p: 350 Kg/m2 x 0.40 m
Piso Terminado: 100 Kg/m2 x 0.40 m D = 550 x 0.40 m = 220 Kg/m
Tabiquería: 100 Kg/m2 x 0.40m
METRADO DE CARGAS
CARGA VIVA (L)
s/c: 200 Kg/m2 x 0.40 m = 80 Kg/m
L = 80 Kg/m
METRADOS DE CARGAS
CARGA ÚLTIMA
Wu = 1.2 (D) + 1.6 L
Wu = 1.2 (220) + 1.6 (80) = 392 Kg/m
Wu = 0.39 Tn/m
CÁLCULO DE MOMENTOS
CÁLCULO DE MOMENTOS
CÁLCULO DE MOMENTOS
CÁLCULO DE ÁREA DE ACERO
Mn = 1.73 Tn.m
f´c = 210 Kg /cm2
fy = 4200 Kg/cm2
CÁLCULO DE ÁREA DE ACERO
1° Asumir “a” = 4.4 cm
2° Calcular As =
𝑀𝑛
𝑓𝑦 (𝑑−𝑎
2)
As =
1.73∗ 105
4200 (22−4.4
2)
= 2.08 cm2
3° Verificar “a”
a =
𝐴𝑠∗ 𝑓𝑦
0.85∗𝑓´𝑐∗𝑏
=
2.08∗4200
0.85∗210∗10
= 4.9 cm
CÁLCULO DE ÁREA DE ACERO
CÁLCULO DE ÁREA DE ACERO
Mn = 1.11 Tn.m
f´c = 210 Kg /cm2
fy = 4200 Kg/cm2
CÁLCULO DE ÁREA DE ACERO
CÁLCULO DE ÁREA DE ACERO
1° Asumir “a” = 3.14 cm
2° Calcular As =
𝑀𝑛
𝑓𝑦 (𝑑−𝑎
2)
As =
1.11∗ 105
4200 (22−3.14
2)
= 1.29 cm2
3° Verificar “a”
a =
𝐴𝑠∗ 𝑓𝑦
0.85∗𝑓´𝑐∗𝑏
=
1.29∗4200
0.85∗210∗10
= 3.04 cm
CÁLCULO DE ÁREA DE ACERO
1° Asumir “a” = 3.14 cm
2° Calcular As =
𝑀𝑛
𝑓𝑦 (𝑑−𝑎
2)
As =
1.11∗ 105
4200 (22−3.14
2)
= 1.29 cm2
3° Verificar “a”
a =
𝐴𝑠∗ 𝑓𝑦
0.85∗𝑓´𝑐∗𝑏
=
1.29∗4200
0.85∗210∗10
= 3.04 cm
CÁLCULO DE ÁREA DE ACERO
CÁLCULO DE ÁREA DE ACERO
1. Asumir “a” = 1.8 cm
2. Calcular As
As=
𝑀𝑛
𝐹𝑦 (𝑑−
𝑎
2
)
=
0.66 𝑥 105
4200 (22−
1.8
2
)
= 0.74 𝑐𝑚2
3. Verificar “a”
a =
𝐴𝑠 ∗ 𝐹𝑦
0.85∗ 𝐹´𝑐∗ 𝑏
=
0.74 (4200)
0.85 210 (10)
= 1.74 𝑐𝑚
CÁLCULO DE ÁREA DE ACERO
CÁLCULO DE ACERO MINIMO
Asmín =
14
𝐹𝑦
(𝑏 ∗ 𝑑)
Asmín =
14
4200
10 22 = 0.73𝑐𝑚
2
(1∅ 3/8")
CÁLCULO DE ACERO MÁXIMO
𝐶 =
3
8
𝑑𝑡 =
3
8
22 = 8.25
a = β1 (c) = 0.85 (8.25) = 7 cm.
As =
0.85 𝑓´𝑐 ∗ 𝑎 ∗ 𝑏
𝑓𝑦
=
0.85 210 7 (10)
4200
Asmáx = 2.98 cm2
CÁLCULO DE FUERZAS CORTANTES
CÁLCULO DE FUERZAS CORTANTES
CÁLCULO DE FUERZAS CORTANTES
CÁLCULO DE FUERZAS CORTANTES
CÁLCULO DE FUERZAS CORTANTES
ACERO DE TEMPERATURA
As = 0.0018 b.t
As = 0.0018 (100 cm) (5cm)
As = 0.90 cm2 (3 φ 1/4”)
Φ 1/4" @ 33 cm.
ACERO DE TEMPERATURA
ACERO DE TEMPERATURA
As = 0.0018 b.t
As = 0.0018 (100 cm) (5cm)
As = 0.90 cm2 (3 φ 1/4”)
Φ 1/4" @ 33 cm 25 cm. (5 t)
DETALLE DE LOSA ALIGERADA
CORTE PRÁCTICO
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA ALIGERADA
LOSA MACIZA
LOSA MACIZA
METRADO DE CARGAS
CARGA MUERTA (D)
P.P. = 1.0 m x 0.15 m x 2400 kg/ m3 = 360 kg/m
PISO TERMINADO = 1.0 m x 100 Kg/m2 = 100 Kg/m
TABIQUERIA = 1.0 m x 100 Kg/m2 = 100 Kg/m
D = 560 Kg/m
CARGA VIVA (L)
S/C : 1.0 m x 200 Kg/m2 L = 200 Kg/m
Metrados de carga muerta (D)
PESO PROPIO: 1 * 0.15 * 2400 = 360 Kg/m
PISO TERMINADO: 1 * 100 = 100 Kg/m
TABIQUERIA: 1 * 100 = 100 Kg/m
560 Kg/m
CARGA VIVA (L)
S/C 1 * 200 = 200 Kg/m
200 Kg/m
Carga última
Wu: 1.2(560) + 1.6(200)
Wu: 992 Kg/m
Wu: 1 tn/m
Wu=1.2D + 1.6L
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
𝑓′
𝑐 = 210 𝑘𝑔/𝑐𝑚2
Mn = 4.44 tn-m
fy = 4200 𝑘𝑔/𝑐𝑚2
LOSA MACIZA
Wu: 1 Tn/m
1.-Asumir
2.-Calcular
3.-Verificar
𝑎=2.4 cm
As=
𝑀𝑛
𝑓𝑦(𝑑−
𝑎
2
) As=
4.44𝑥105
4200(12−
2.4
2
)
As=9.79 𝑐𝑚2
a =
𝐴𝑠∗𝑓𝑦
0.85∗𝑓𝑐∗𝑏
a =
9.79∗4200
0.85∗210∗100
a =2.3 𝑐𝑚
LOSA MACIZA
∅ AS
3 8 0.71
1 2
3 4
5 8
1
1.27
1.98
2.85
5.07
# de varillas=
9.79
1.98
= 5
En 1 m =
100
5
=20 cm
∅ 5 8 @20cm
LOSA MACIZA
∅ AS
3 8 0.71
1 2
3 4
5 8
1
1.27
1.98
2.85
5.07
# de varillas=
9.79
1.98
= 5
En 1 m =
1
5
=0.20 m
1
9.79
1.98
=
1.98
9.79
=0.20m
LOSA MACIZA
𝑓′
𝑐 = 210 𝑘𝑔/𝑐𝑚2
Mn = 2.86 tn-m
fy = 4200 𝑘𝑔/𝑐𝑚2
4.44 2.3
2.86 a
a=
2.86∗2.3
4.44
=1.48cm
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA
LOSA MACIZA

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LOSAS DE CONCRETO.pptx