26
2 • Caractéristiques des sections
Géométrie
Section
Centre de
gravité
Moment statique
Moment quadratique
G
O
b h
h
B
H
z
y
S = BH − h(B − b)
z G =
H Oy
S
y G =
H Oz
S
H Oz =
(B − b)h 2 + bH 2
2
H Oy =
B 2 h + hb 2
2
I Gz =
(B − b)h 3 + bH 3
3
− y
2
G S
I Gy =
h B 3 + hb 3
3
− z
2
G S
G
O
b
h
B
H
z
y
S = BH − h(B − b)
z G = B−
b
2
y G =
H
2
H Oz =
BH 2 − hH(B − b)
2
H Oy = z G S
I Gz =
BH 3 − h 3 (B − b)
12
I Gy =
2hb 3 + (H − h)(2B − b) 3
24
G
O
b
h
z
y
S =
1
2
bh
z G =
b
3
y G =
h
3
H Oz =
bh 2
6
H Oy =
b 2 h
6
I Gz =
bh 3
36
I Gy =
hb 3
36
G
O
d
z
y
S =
pd 2
4
z G =
d
2
y G =
d
2
H Oz =
pd 3
8
H Oy =
pd 3
8
I Gz =
pD 4
64
I Gy =
pD 4
64
G
O
d
D
z
y
S =
p(D 2 − d 2 )
4
z G =
D
2
y G =
D
2
H Oz =
p(D 3 − d 2 D)
8
H Oy =
p(D 3 − d 2 D)
8
I Gz =
p(D 4 − d 4 )
64
I Gy =
p(D 4 − d 4 )
64
G
O
d
z
y
S =
pd 2
8
z G =
d
2
y G =
2d
3p
H Oz =
d 3
12
H Oy =
pd 3
16
I Gz =
d 4
16
p
8
−
8
9p
I Gy =
pd 4
128