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Selecct method A, B, or C:
A. Analysis of column
B. Design of column with dimensions assumed
C. Design of column with steel ratio assumed
f'c (ksi)
fy (ksi)
shape
3
4
5
40
60
75
rectangular (tied)
circular (spiral)
""
Dimensions:
Reinforcement:
Number of bars
Bar size
4
5
6
7
8
9
10
11
12
13
14
No. 4 (US) or No. 13 (SI)
No. 5 (US) or No. 16 (SI)
No. 6 (US) or No. 19 (SI)
No. 7 (US) or No. 22 (SI)
No. 8 (US) or No. 25 (SI)
No. 9 (US) or No. 29 (SI)
No. 10 (US) or No. 32 (SI)
No. 11 (US) or No. 36 (SI)
No. 14 (US) or No. 43 (SI)
No. 18 (US) or No. 57 (SI)
2
3
4
5
6
7
Maximum allowable design (factored) load or capacity, Pu:
""
Dimensions:
Design (factored) load, Pu:
kips
lb
Required steel area:
""
Rebar choices:
""
""
""
""
""
""
""
""
""
""
""
Design (factored) load, Pu:
kips
lb
Assumed steel ratio:
1 percent
2 percent
3 percent
4 percent
5 percent
6 percent
7 percent
8 percent
Gross area corresponding to steel ratio:
""
Checks:
errors:
A. Analysis of column
width or diameter must be > 0
length must be > 0
steel area must be < gross area
minimum 6 bars for spiral
minimum 4 bars for tied column
reinf ratio must be >= 0.01
reinf ratio must <= 0.08
no. bars in line must be <= total/2
total bars in rect. col. must be even
column too small - bar fit check no good
B. Col design with dimensions assumed
width or diameter must be > 0
length must be > 0
design load must be > 0
C. Col design with steel ratio assumed
design load must be > 0
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