Your LOGO Calculation Sheet
Project : Design of Foundation for 3-Legged Tower Designed : DemLegaspi Job No. :
Location : Checked : Date : 9-7-2003
Configuration : Type : Author : Dem
1.0 MATERIAL PROPERTIES
f'c = 20.70 MPa Compressive strength of concrete
fy = 275.00 MPa Yield strength of Rebar
γ soil = 18.00 kN/m3 Unit weight of soil
γ concrete = 23.50 kN/m3 Unit weight of concrete
Qallowable = 100.00 kPa Allowable Soil Bearing Capacity
2.0 DIMENSIONS / GEOMETRY
B = 4.00 m Width of footing <<< BASE OVERLAP - Decrease SIZE of BASE!
Top = 0.50 m Dimension from Top of Pedestal to Ground Level
D = 2.50 m Depth of embedment
cc = 75.00 mm Concrete protective cover
deff = 2.43 m Effective depth of footing
Thk = 1000.00 mm Thickness of footing
f main = 20.00 mm Diameter of Rebar
WtFdn = 940.00 kN Weight of foundation
WtFill = 567.00 kN Weight of soil above footing (Backfill)
a = 1000.00 mm Dimension of pedestal (along X direction)
b = 1000.00 mm Dimension of pedestal (along Z direction)
Wtped = 47.00 kN Weight of pedestal
Surcharge = 0.00 kN Additional Load above foundation
Leg to Leg = 5.60 m Leg to Leg Distance
zz
4.00
zz
A xx 2 1
Mxx
5.60
3.23
4.00
xx
Mzz
X 3 4
xx xx
1.62
P
0.50
Z
B C
1.50
zz zz
2.50
2.80 2.80
5.60
1.00
FOUNDATION LAYOUT FOOTING DETAIL
Page 1 of 9 Filename: Isolated 3-Legged (for Posting).xls.xls
Your LOGO Calculation Sheet
Project : Design of Foundation for 3-Legged Tower Designed : DemLegaspi Job No. :
Location : Checked : Date : 9-7-2003
Configuration : Type : Author : Dem
3.0 APPLIED LOADS
Applied Loads at Pedestal A: (Footing A)
Staad Results Foundation Load
Primary Load Cases
Fy Fx Fz P Mxx Mzz
(Service Loads)
kN kN kN kN kN-m kN-m
1 ) Dead Load (DL) 84.65 0.00 -7.36 84.65 -22.07 0.00
2 ) Live Load (LL) 2.94 0.00 -0.22 2.94 -0.66 0.00
3 ) Seismic Load (EQx) 0.00 1.68 0.00 0.00 0.00 5.03
4 ) Seismic Load (EQz) -848.66 0.00 81.88 -848.66 245.63 0.00
5 ) Wind Load (WL+0°) 2072.78 0.00 -251.36 2072.78 -754.07 0.00
6 ) Wind Load (WL+90°) -1450.50 0.00 175.53 -1450.50 526.60 0.00
7 ) Wind Load (WL+270°) -1148.15 18.52 151.41 -1148.15 454.24 55.55
8 ) Wind Load (WL+180°) 0.00 -17.82 -0.02 0.00 -0.07 -53.47
Applied Loads at Pedestal B: (Footing B)
Staad Results Foundation Load
Primary Load Cases
Fy Fx Fz P Mxx Mzz
(Service Loads)
kN kN kN kN kN-m kN-m
1 ) Dead Load (DL) 84.65 -6.37 3.68 84.65 -11.03 19.11
2 ) Live Load (LL) 2.94 -0.19 0.11 2.94 -0.33 0.57
3 ) Seismic Load (EQx) -734.96 61.83 -34.73 -734.96 108.54 -182.97
4 ) Seismic Load (EQz) 424.33 -34.73 21.73 424.33 -57.63 108.54
5 ) Wind Load (WL+0°) -842.38 842.38 -81.15 -842.38 2066.85 -1474.42
6 ) Wind Load (WL+90°) 725.25 -69.06 55.31 725.25 -96.47 247.30
7 ) Wind Load (WL+270°) -9.89 7.70 9.11 -9.89 33.69 12.13
8 ) Wind Load (WL+180°) 824.58 -80.82 51.39 824.58 -132.89 254.73
Applied Loads at Pedestal C: (Footing C)
Staad Results Foundation Load
Primary Load Cases
Fy Fx Fz P Mxx Mzz
(Service Loads)
kN kN kN kN kN-m kN-m
1 ) Dead Load (DL) 84.65 6.37 3.68 84.65 11.03 19.11
2 ) Live Load (LL) 2.94 0.19 0.11 2.94 0.33 0.57
3 ) Seismic Load (EQx) 734.96 61.83 34.73 734.96 108.54 182.97
4 ) Seismic Load (EQz) 424.33 34.73 21.73 424.33 57.63 108.54
5 ) Wind Load (WL+0°) -1036.39 -99.27 -81.15 -1036.39 -136.17 -359.74
6 ) Wind Load (WL+90°) 725.25 69.06 55.31 725.25 96.47 247.30
7 ) Wind Load (WL+270°) 1158.04 122.80 91.18 1158.04 182.29 421.09
8 ) Wind Load (WL+180°) -824.58 -81.99 -82.04 -824.58 -89.95 -336.13
Excess Weight of Footing and Pedestal: (DL) << Additional DeadLoad
V = Volume of displaced Soil
= Volume occupied by Footing and Pedestal
= 17.50 m3
Fy = Excess weight from concrete
= V * (Concrete density - Soil density) + Wt of pedestal (extruded)
Fy = 108.00 kN
Page 2 of 9 Filename: Isolated 3-Legged (for Posting).xls.xls
