Design Of Square Rectangular Isolated Footing Spreadsheet

Design Of Square Rectangular Isolated Footing Spreadsheet

 

An isolated footing is one of the most used types of foundation to support single-columns when they are arranged at a long distance. An isolated footing must be designed to avoid exceeding its bearing capacity and provide safety against overturning or sliding while preventing the ground from settling.

 

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Design Of Spread Footing As Per ACI 318-07 Spreadsheet

Design Of Spread Footing As Per ACI 318-07 Spreadsheet

 

  • PIPE SUPPORT FOUNDATION
  • DESIGN OF SPREAD FOOTING TO ACI 318-07
  • DESIGN OF ISOLATED FOOTING

    Density Of Concrete
    Density Of Soil
    Depth Of Foundation
    Soil Bearing Capacity
    Length Of Footing
    Width Of Footing
    Thickness of Fdtn.
    Width Of Pedestal
    Length Of Pedestal
    Height Of Pedestal
    Coefficient Of Friction
    Ground Water Table Ht.

    1.0  Load Calculation for Footing & Soil:
    Self Wt. Of Footing
    Weight of Soil
    Self Wt. Of Pedestal
    Weight of Footing + Soil

    2.0 Check Maximum and Minimum Pressure at Footing Base:
    Area of Footing
    Section Modulus
    Section Modulus
    Total Vertical Load

    3.0 Check for Overturning:
    Overturning Moment
    Due to External Load
    Due to wt. of Pedestal
    Due to Self Wt. of Fdn
    Due to Wt. of Soil
    Total Stabilizing Moment
    F.O.S. against Overturning

    4.0 Check for Sliding:
    Resultant Shear Force
    Total Vertical Load
    F.O.S. against Sliding

    5.0 Load Case Check:
    Check Max. & Mini. Pressure at Footing Base:

    6.0 Check for Overturning & Sliding:

    7.0 Check For Shear
    a) Two Way Shear
    b) One Way Shear

    8.0 Design Of Foundation/Footing:
    a) Calculation of Reinforcement at Bottom
    b) Calculation of Reinforcement at Top

This presents the design of isolated spread footing using the results from Staad Support Reactions.

Calculation Reference
Reinforced Concrete Footings

 

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Design Of Concentrically Loaded Isolated Footing Spreadsheet

Design Of Concentrically Loaded Isolated Footing Spreadsheet

 

The footings were proportioned so that the bearing pressure does not exceed the safe bearing capacity of the soil. The bending moments and shears are determined at critical sections. The calculation follows methods set out in ACI 318-08.

Calculation Reference
Reinforced Concrete Design

 

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