Page 44 - Civil Engineering Formulas

Radius of gyration I d 2 (h – d) + 2b 4 (approx) I πB t h + 4 3I (2B + 5.2H) t

2
π
r =

b 3 (h – d)
b 3 (h – d)
Moment of inertia and section modulus 3π l (h 3 – d 3 )+ b + d 4 16 12 3π l (h 3 + d 3 )+ b + d 4 16 6h πBh 2 πB 3 t + + B 2 h + 2 16 4 B 2I H – = h 2 H + t 64 (b 1 h 1 3 – b 2 h 2 3 ), where I = 105 1 1 (B + 2.6t) b 1 = t) (H + h
h 3
2
3

=
I =
I =
=
c
I
c
I
t H I c
1
Corrugated sheet iron, B parabolically curved
h
h
H
d
B
Section b b B 2 4 B h 4 B B 2 h b 2 b 1
2
t

18