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Project :
Footing Number :
Design 3-Pile Cap Footing Engineer :
1.Input Data col. width (b) col. depth (h) covering soil density depth of soil cave min. depth
= = = = = =
2.Material Properties bar size (DB) steel grade fy fs fc' concrete factor fc Es Ec n
0.4 m 0.4 m 5 cm 1,700 kg/m3 0.50 m 15 cm for clay soil 30 cm for another soil
= = = = = = = = = =
16 SD-30 3,000 1,500 173 0.45 78 ### 198,873 11
mm
= =
0.5 50,000
m kg
= = = =
0.9 0.9 1.5 0.4
m m m2 m
= = = =
1,440 1,275 60,000 3,000
kg kg kg kg-m
3.Pile and Footing Properties Pile ; diameter/dimensions safe load of pile Footing ; width (B) for Pile 11 width (B) for Pile 12,13 area depth (D) 4.Loadind Data Dead Load Soil Dead Load Column Load Mx
ksc ksc ksc ksc ksc ksc
5.Pile Arrangement number of total pile X - direction number of row number of pile on each row spacing between pile spacing at edge of footing total length dx-1 dx-2 6.Reaction on Piles Summation of dx^2 P/n Mx*dx-1/(dx^2) Mx*dx-2/(dx^2) No. of Piles 11 12 13
P/n
Mx*dx1/ (dx)^2 20,905 2,302 20,905 0 20,905 0
7.Design Parameters k j R Allowable Beam Shear Allowable Punching Shear
Date : =
3
2 2 1.5 0.5 0.9 0.867 0.433 = = = =
Y - direction number of column number of pile on each column spacing between pile spacing at edge of footing total width
1.13 20,905 2,302 1,150
Mx*dx2/ R1 (dx)^2 (kg) 0 18,603 1,150 22,055 1,150 22,055
3 2 1.5 0.5 0.9
m2 kg kg kg R2 Tension Safe Load (kg) Status Status 23,207 >0 O.K. 19,755 >0 O.K. 19,755 >0 O.K.
= = = = =
0.364 0.879 12.48 3.81 6.97
ksc [ 0.29*sqrt(fc') ] [ 0.53*sqrt(fc') ]
8.Checking Shearing Stresses Punching Shear Req. effective depth =
32.60
cm
Project :
Total Axial Load
=
d/2 = b/2 = h/2 = bo = 2(b+d) + 2(h+d) = No. of Piles 11 12 13
dx (cm) 86.7 43.3 43.3
"d" Y-dir 50.7 7.3 7.3
shear force "V" (R1) actual shear stress "v" all. "v" shear force "V" (R2) actual shear stress "v" all. "v" Beam Shear No. of dx Piles (cm) 11 86.7 12 43.3 13 43.3
Footing Number :
Design 3-Pile Cap Footing Engineer :
62,715
kg
16.0 20.0 20.0 300
cm cm cm cm
d at Y-direction actual Factored Status distance R1' pile out cr.section 50.7 18,603 pile out cr.section 7.3 16,394 pile out cr.section 7.3 16,394 = = = = = =
51,391 5.35 6.97 52,576 5.48 6.97
> >
"d" d at Y-dir diagonal d at diago Y-dir Status distance Status 34.7 pile out -8.7 pile in 36.0 pile out -8.7 pile in 36.0 pile out
shear force for Pile 11 actual shear stress "v" all. "v"
= = =
23,207 8.06 3.81
shear force for Pile 12,13 actual shear stress "v"
= =
13,968 4.85
36.69 Try Again 31.07 O.K. cm2 cm2 ksc cm
> >
18.82 29.53
10.Bond Length of Dowels This is the bond length of dowels for only major direction due to moment Ch. depth Number of col. Bars on tension sides 4 sizes of col. bars = 16 mm As of col. bars = 2.01 cm2 As - total = 8.04 cm2
O.K. O.K.
Project :
all. "v"
=
Footing Number : 3.81
