Page 43 - Civil Engineering Formulas

(approx)
(h – d)
Radius of gyration
t
h
+ 2b
I
+
I
πB
4
d 2
4
2
π
b 3 (h – d)
b 3 (h – d)
Moment of inertia and section modulus
h 3
(b 1 h 1 3 – b 2 h 2 3 ), where
2
3
B
2
+
H –
(h 3 – d 3 )+
(h 3 + d 3 )+
πBh 2
2
=
h
+
B 2 h
b
b
+
+
+
d 4
d 4
πB 3
16
105
3π
3π
16
16
64
H + t
2I
I =
6h
12
4
t
l
l
=
I =
=
I =
I
c
I
c
t H 1 1 (B + 2.6t) b 1 = t) (H + h 1 = 4 2 3I r = 1 1 (2B + 5.2H) t (B – 2.6t) b 2 = t) (H – h 2 = 4 2 2I I = t H + c
1
Corrugated sheet iron, B parabolically curved
h
h
H
d
Section b b B 2 4 B h 4 B B 2 h b 2 b 1
2
B
t
18