Foundation Calculation Sheet
Foundation Calculation Sheet
Foundation Calculation Sheet
Isolated Footing 70
Input Values
Footing Geomtery
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 2 of 44
Column Dimensions
Pedestal
Include Pedestal? No
Pedestal Shape : N/A
Pedestal Height (Ph) : N/A
Pedestal Length - X (Pl) : N/A
Pedestal Width - Z (Pw) : N/A
Design Parameters
Soil Properties
------------------------------------------------------
Design Calculations
Footing Size
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 3 of 44
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 4 of 44
If Au is zero, there is no uplift and no pressure adjustment is necessary. Otherwise, to account for uplift, areas of negative pressure will be set to zero and the
pressure will be redistributed to remaining corners.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 5 of 44
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - X Direction
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - Z Direction
Shear Calculation
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 6 of 44
Along X Direction
Check that 0.75 X Vc > Vux where Vux is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about the
X axis.
Along Z Direction
Check that 0.75 X Vc > Vuz where Vuz is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about
the Z axis.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 7 of 44
Calculate the flexural reinforcement along the X direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
Required = 0.00001
Since OK
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 8 of 44
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.194 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, 500.000 mm
distance between bars, Cd = Min. User Spacing) =
Calculate the flexural reinforcement along the Z direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
Factor
from ACI 0.850
Cl.10.2.7.3
=
From ACI
Cl. 10.3.2, 0.03783
=
From ACI
Cl. 10.3.3, 0.02837
=
From ACI
Cl.7.12.2, 170285828775912630000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
=
From Ref. 15.406
1, Eq.
3.8.4a,
constant
m=
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 9 of 44
Design for
flexure
about X
axis is
performed
at the
face of 0.173
the
column at
a
distance,
Dz =
Ultimate
0.027
moment,
Nominal
moment
capacity, 0.030
Mn =
Required
0.00001
=
Since OK
Area of
Steel
Required, 179975103726754580000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
As =
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.178 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, Min. 500.000 mm
distance between bars, Cd = User Spacing) =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 10 of 44
Bending moment for uplift cases will be calculated based solely on selfweight, soil depth and surcharge loading.
As the footing size has already been determined based on all servicebility load cases, and design moment calculation is based on selfweight, soil depth and
surcharge only, top reinforcement value for all pure uplift load cases will be the same.
Calculate the flexural reinforcement for Mx. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
Required = 0.00004
Since OK
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 11 of 44
Calculate the flexural reinforcement for Mz. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
Required = 0.00003
Since OK
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 12 of 44
Isolated Footing 71
Input Values
Footing Geomtery
Column Dimensions
Pedestal
Include Pedestal? No
Pedestal Shape : N/A
Pedestal Height (Ph) : N/A
Pedestal Length - X (Pl) : N/A
Pedestal Width - Z (Pw) : N/A
Design Parameters
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 13 of 44
Soil Properties
------------------------------------------------------
Design Calculations
Footing Size
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 14 of 44
If Au is zero, there is no uplift and no pressure adjustment is necessary. Otherwise, to account for uplift, areas of negative pressure will be set to zero and the
pressure will be redistributed to remaining corners.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 15 of 44
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - X Direction
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - Z Direction
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 16 of 44
Shear Calculation
Along X Direction
Check that 0.75 X Vc > Vux where Vux is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about the
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 17 of 44
X axis.
Along Z Direction
Check that 0.75 X Vc > Vuz where Vuz is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about
the Z axis.
Calculate the flexural reinforcement along the X direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 18 of 44
Required = 0.00001
Since OK
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.194 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, 500.000 mm
distance between bars, Cd = Min. User Spacing) =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 19 of 44
Calculate the flexural reinforcement along the Z direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
Factor
from ACI 0.850
Cl.10.2.7.3
=
From ACI
Cl. 10.3.2, 0.03783
=
From ACI
Cl. 10.3.3, 0.02837
=
From ACI
Cl.7.12.2, 170285828775912630000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
=
From Ref. 15.406
1, Eq.
3.8.4a,
constant
m=
Design for
flexure
about X
axis is
performed
at the
face of 0.173
the
column at
a
distance,
Dz =
Ultimate
0.027
moment,
Nominal
moment
capacity, 0.030
Mn =
Required
0.00001
=
Since OK
Area of
Steel
Required, 179975103726754580000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
As =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 20 of 44
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.178 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, Min. 500.000 mm
distance between bars, Cd = User Spacing) =
Bending moment for uplift cases will be calculated based solely on selfweight, soil depth and surcharge loading.
As the footing size has already been determined based on all servicebility load cases, and design moment calculation is based on selfweight, soil depth and
surcharge only, top reinforcement value for all pure uplift load cases will be the same.
Calculate the flexural reinforcement for Mx. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 21 of 44
Required = 0.00004
Since OK
Calculate the flexural reinforcement for Mz. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 22 of 44
Required = 0.00003
Since OK
Isolated Footing 72
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 23 of 44
Input Values
Footing Geomtery
Column Dimensions
Pedestal
Include Pedestal? No
Pedestal Shape : N/A
Pedestal Height (Ph) : N/A
Pedestal Length - X (Pl) : N/A
Pedestal Width - Z (Pw) : N/A
Design Parameters
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 24 of 44
Soil Properties
------------------------------------------------------
Design Calculations
Footing Size
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 25 of 44
If Au is zero, there is no uplift and no pressure adjustment is necessary. Otherwise, to account for uplift, areas of negative pressure will be set to zero and the
pressure will be redistributed to remaining corners.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 26 of 44
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - X Direction
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - Z Direction
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 27 of 44
Shear Calculation
Along X Direction
Check that 0.75 X Vc > Vux where Vux is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about the
X axis.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 28 of 44
Along Z Direction
Check that 0.75 X Vc > Vuz where Vuz is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about
the Z axis.
Calculate the flexural reinforcement along the X direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 29 of 44
Required = 0.00001
Since OK
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.194 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, 500.000 mm
distance between bars, Cd = Min. User Spacing) =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 30 of 44
Calculate the flexural reinforcement along the Z direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
Factor
from ACI 0.850
Cl.10.2.7.3
=
From ACI
Cl. 10.3.2, 0.03783
=
From ACI
Cl. 10.3.3, 0.02837
=
From ACI
Cl.7.12.2, 170285828775912630000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
=
From Ref. 15.406
1, Eq.
3.8.4a,
constant
m=
Design for
flexure
about X
axis is
performed
at the
face of 0.173
the
column at
a
distance,
Dz =
Ultimate
0.027
moment,
Nominal
moment
capacity, 0.030
Mn =
Required
0.00001
=
Since OK
Area of
Steel
Required, 179975103726754580000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
As =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 31 of 44
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.178 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, Min. 500.000 mm
distance between bars, Cd = User Spacing) =
Bending moment for uplift cases will be calculated based solely on selfweight, soil depth and surcharge loading.
As the footing size has already been determined based on all servicebility load cases, and design moment calculation is based on selfweight, soil depth and
surcharge only, top reinforcement value for all pure uplift load cases will be the same.
Calculate the flexural reinforcement for Mx. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 32 of 44
Required = 0.00004
Since OK
Calculate the flexural reinforcement for Mz. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
0.03783
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 33 of 44
Required = 0.00003
Since OK
Isolated Footing 73
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 34 of 44
Input Values
Footing Geomtery
Column Dimensions
Pedestal
Include Pedestal? No
Pedestal Shape : N/A
Pedestal Height (Ph) : N/A
Pedestal Length - X (Pl) : N/A
Pedestal Width - Z (Pw) : N/A
Design Parameters
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 35 of 44
Soil Properties
------------------------------------------------------
Design Calculations
Footing Size
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 36 of 44
If Au is zero, there is no uplift and no pressure adjustment is necessary. Otherwise, to account for uplift, areas of negative pressure will be set to zero and the
pressure will be redistributed to remaining corners.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 37 of 44
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - X Direction
Critical Load Case And The Governing Factor Of Safety For Overturning And Sliding - Z Direction
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 38 of 44
Shear Calculation
Along X Direction
Check that 0.75 X Vc > Vux where Vux is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about the
X axis.
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 39 of 44
Along Z Direction
Check that 0.75 X Vc > Vuz where Vuz is the shear force for the critical load cases at a distance deff from the face of the column caused by bending about
the Z axis.
Calculate the flexural reinforcement along the X direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 40 of 44
Required = 0.00001
Since OK
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.194 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, 500.000 mm
distance between bars, Cd = Min. User Spacing) =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 41 of 44
Calculate the flexural reinforcement along the Z direction of the footing. Find the area of steel required, A, as per Section 3.8 of Reinforced Concrete Design
(5th ed.) by Salmon and Wang (Ref. 1)
The strength values of steel and concrete used in the formulae are in ksi
Factor
from ACI 0.850
Cl.10.2.7.3
=
From ACI
Cl. 10.3.2, 0.03783
=
From ACI
Cl. 10.3.3, 0.02837
=
From ACI
Cl.7.12.2, 170285828775912630000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
=
From Ref. 15.406
1, Eq.
3.8.4a,
constant
m=
Design for
flexure
about X
axis is
performed
at the
face of 0.173
the
column at
a
distance,
Dz =
Ultimate
0.027
moment,
Nominal
moment
capacity, 0.030
Mn =
Required
0.00001
=
Since OK
Area of
Steel
Required, 179975103726754580000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
As =
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 42 of 44
Because the number of bars is rounded up, make sure new reinforcement ratio < ρmax
Total reinforcement area, As_total = Nbar X (Area of one bar) = 226.193 mm2
deff = D - Ccover - 0.5 X (dia. of one bar) 0.178 m
=
From ACI Cl.7.6.1, minimum req'd clear max (Diameter of one bar, 1.0, Min. 500.000 mm
distance between bars, Cd = User Spacing) =
Bending moment for uplift cases will be calculated based solely on selfweight, soil depth and surcharge loading.
As the footing size has already been determined based on all servicebility load cases, and design moment calculation is based on selfweight, soil depth and
surcharge only, top reinforcement value for all pure uplift load cases will be the same.
Calculate the flexural reinforcement for Mx. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 43 of 44
Required = 0.00004
Since OK
Calculate the flexural reinforcement for Mz. Find the area of steel required
The strength values of steel and concrete used in the formulae are in ksi
0.03783
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020
Isolated Footing Design Page 44 of 44
Required = 0.00003
Since OK
file:///C:/Staad.foundation%205.3/CalcXsl/footing.xml 23/12/2020