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Name of Project: hhghh General Notes:
Job No.: hhghh gkg
Client: yyy uyuu
Designed by: uuu hgh
Date: tyyuy
Sheet: 2 Of 2
*Input data in green cells
CIRCULAR COLUMN(for short compression member only)
By Whitney Formula
Column no. b1
specification
fc' 22 MPa
fy 414 Mpa
structural system
service load
unfactored Dead load 80 kN
unfactored Live load 90 kN
load eccentricity, e 30 cm
column
Lu, unsupported height 4 m column is over designed by 36.62%
h, diameter (min. 25 cm.) 40 cm OK - acceptable
conc. cover in. (min. 1.5 in.) 4 cm
~ capacity reduction factor 0.7
main bar no.of bar
25mm 6 1.00% 2.35% 8.00% OK - r-bar spacing
spiral wire10mm
P
e = 30 cm.
h = 40 cm.
cl
10mm spiral wire 6 -25mm
6.985 mm pitch longitudinal bar
10mm spiral wire
6 -25mm @ 6.985 mm pitch
longitudinal bar
REMARKS:
1. column property : Tension Controls
h = 40 cm. Slenderness critical
2. column ultimate capacity = 418.112 kN
3. % of reinforcement 2.35%
4. OK - r-bar spacing
min 6 - 20mm
max.
% r-bar
actual %
r-bar
unbraced against sidesway
Jerv Works Const. Ref: Reinforced Concrete Structures, pg. 149
by: R. Park & T. Paulay
min. %
r-bar
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spiral wire loop ACI-7.10.4
S spiral wire loop = As(Dc - Ds)/sAc 2.7873529 in.
or min. spiral wire loop 1 in.
say max = 2.7873529 in.
but not more than 3 in.
if= 2.7873529 in.
adapted spiral wire loop 2.75 in.
6.985 cm
check longitudinal bar spacing
inner diameter 10.8254 in.
inner circumference 34.008997 in.
actual spacing of longitudinal bars 4.68 in.
min. spacing of longitudinal bars = dia * 1.5 1.4775 in.
or 1.5 in.
required min. spacing 1.5 in.
