ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAI
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Daniel
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PROJECT :
PAGE :
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Tian Li
CLIENT :
DESIGN BY :
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JOB NO. :
DATE :
REVIEW BY :
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Concrete Column Design Based on ACI 318-05
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INPUT DATA & DESIGN SUMMARY
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CONCRETE STRENGTH
fc'=4.2ksi
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REBAR YIELD STRESS
fy=60ksi
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COLUMN DIMENSIONS
cx=36in
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cy=40in
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FACTORED AXIAL LOAD
Pu=1700k
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FACTORED MAGNIFIED MOMENT
Mu,x=800ft-k
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Mu,y=100ft-k
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FACTORED SHEAR LOAD
Vu,x=130k
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Vu,y=150k
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COLUMN VERT. REINF.
8#10
at x dir.
(Total 30 # 10)
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9#10
at y dir.
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SHEAR REINF.
4legs,#4@12
in o.c., x dir.
THE COLUMN DESIGN IS ADEQUATE.
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2legs,#4@12
in o.c., y dir.
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ANALYSIS
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f Pn (k)
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f Pn (kips)f Mn (ft-kips)
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AT AXIAL LOAD ONLY
37910
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AT MAXIMUM LOAD
37911058
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AT 0 % TENSION
33431492
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100
AT 25 % TENSION
27731958
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AT 50 % TENSION
22902251
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AT e t = 0.002
15642583
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AT BALANCED CONDITION
15212609
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f Mn (ft-k)
AT e t = 0.005
6673275
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AT FLEXURE ONLY
02726
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CHECK FLEXURAL & AXIAL CAPACITY
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Mu = ( Mu,x2 + Mu,y2 )0.5 =
806.225786
ft-k, (combined bending load.)
q =7.13
o , (the direction of combined load.)
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f Pmax =0.80 f [ 0.85 fc' (Ag - Ast) + fy Ast] =
3791.20716
kips., (at max axial load, ACI 318-05, Sec. 10.3.6.2)
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wheref = 0.65
(ACI 318-05, Sec.9.3.2.2)
>Pu
[Satisfactory]
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Ag =1440in2.Ast =38.10in2.
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a = Cbb1 =20
in (at balanced strain condition, ACI 10.3.2)
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f = 0.48 + 83 et =
0.652
(ACI 318-05, Fig. R9.3.2)
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where
Cb = d ec / (ec + es) =
24inet =0.002069ec =0.003
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d =41.21488209
in, (ACI 7.7.1)
b1 =0.84
( ACI 318-05, Sec. 10.2.7.3 )
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f Mn = 0.9 Mn =
2726
ft-kips @ Pn = 0, (ACI 318-05, Sec. 9.3.2) ,& et,min = 0.004, (ACI 318-05, Sec. 10.3.5)
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f Mn =2521
ft-kips @ Pu =
1700kips>Mu
[Satisfactory]
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rmax=0.08
(ACI 318-05, Section 10.9)
rprovd=0.026
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rmin=0.01
(ACI 318-05, Section 10.9)
[Satisfactory]
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CHECK SHEAR CAPACITY (ACI 318-05 Sec. 11.1.1, 11.3.1, & 11.5.6.2)
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f Vn = f (Vs + Vc)
(ACI 318-05 Sec. 11.1.1)
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>Vu
[Satisfactory]
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wheref =0.75
(ACI 318-05 Sec. 9.3.2.3)
fy =60ksi
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dA0AvVc =
2 (fc')0.5A0
Vs =
MIN (d fy Av / s , 4Vc)
f Vn
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x37.371345.140.80174.4149.5243
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y33.371334.60.40173.066.7180
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smax=18
(ACI 318-05, Section 10.16.8.5)
sprovd=12in
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smin=1
(ACI 318-05, Section 7.10.4.3)
[Satisfactory]
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LICENSE NUMBER: ?????
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