Mecanica de Materiales - 7ma.Ed_James

F
Propiedades de
la madera
la estructural madera estructural
2
1 1
h
2
b
PROPIEDADES DE MADERA CEPILLADA (LISTA CONDENSADA)
Dimensiones
nominales
Dimensiones
netas
Área
b h b h A bh
Momento de
inercia
I 1
3
bh
12
Eje 1-1 Eje 2-2
Módulo de
sección
S 1
Momento de
inercia
bh 2 hb
I
6 2
12
3
Módulo de
sección
S 2
hb 2
6
Peso por
pie lineal
(densidad
en peso =
35 lb/ft 3 )
in in in 2 in 4 in 3 in 4 in 3 lb
2 4 1.5 3.5 5.25 5.36 3.06 0.98 1.31 1.3
2 6 1.5 5.5 8.25 20.80 7.56 1.55 2.06 2.0
2 8 1.5 7.25 10.88 47.63 13.14 2.04 2.72 2.6
2 10 1.5 9.25 13.88 98.93 21.39 2.60 3.47 3.4
2 12 1.5 11.25 16.88 177.98 31.64 3.16 4.22 4.1
3 4 2.5 3.5 8.75 8.93 5.10 4.56 3.65 2.1
3 6 2.5 5.5 13.75 34.66 12.60 7.16 5.73 3.3
3 8 2.5 7.25 18.13 79.39 21.90 9.44 7.55 4.4
3 10 2.5 9.25 23.13 164.89 35.65 12.04 9.64 5.6
3 12 2.5 11.25 28.13 296.63 52.73 14.65 11.72 6.8
4 4 3.5 3.5 12.25 12.51 7.15 12.51 7.15 3.0
4 6 3.5 5.5 19.25 48.53 17.65 19.65 11.23 4.7
4 8 3.5 7.25 25.38 111.15 30.66 25.90 14.80 6.2
4 10 3.5 9.25 32.38 230.84 49.91 33.05 18.89 7.9
4 12 3.5 11.25 39.38 415.28 73.83 40.20 22.97 9.6
6 6 5.5 5.5 30.25 76.3 27.7 76.3 27.7 7.4
6 8 5.5 7.5 41.25 193.4 51.6 104.0 37.8 10.0
6 10 5.5 9.5 52.25 393.0 82.7 131.7 47.9 12.7
6 12 5.5 11.5 63.25 697.1 121.2 159.4 58.0 15.4
8 8 7.5 7.5 56.25 263.7 70.3 263.7 70.3 13.7
8 10 7.5 9.5 71.25 535.9 112.8 334.0 89.1 17.3
8 12 7.5 11.5 86.25 950.5 165.3 404.3 107.8 21.0
Nota: los ejes 1-1 y 2-2 son ejes centroidales principales.
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