8
|
12
| |||||||
7
|
12
|
12
| ||||||
6
|
12
|
12
|
12
| |||||
5
|
12
|
12
|
12
|
12
| ||||
4
|
16
|
12
|
12
|
12
|
12
| |||
3
|
16
|
16
|
12
|
12
|
12
|
8
| ||
2
|
16
|
16
|
16
|
12
|
12
|
12
|
8
| |
1
|
20
|
16
|
16
|
16
|
12
|
12
|
12
|
8
|
Stories
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
1
|
6
|
8
| |||||
5
|
8
|
8
| ||||
4
|
8
|
8
|
8
| |||
3
|
8
|
8
|
8
|
8
| ||
2
|
12
|
8
|
8
|
8
|
8
| |
1
|
12
|
12
|
8
|
8
|
8
|
8
|
Stories
|
6
|
5
|
4
|
3
|
2
|
1
|
P = Ac fc (1 plus 15p plus 50p')
| |
where
| |
fc does not exceed S15 or, in any case, 850
pounds.
| |
Ac = area of core of spirally-hooped column
measured to the outside diameter of the spiral.
| |
p = ratio of effective area of longitudinal
reinforcement to the area of concrete core.
| |
p' = ratio of volume of lateral reinforcement
to the volume of concrete core.
|
P = fc Ag (1 plus npg)
| |
where
| |
fc does not exceed S15.
| |
Ag = gross area of reinforced concrete.
| |
pg = ratio of longitudinal reinforcement to
the gross area of columns.
|