Foundation Design using SAFE

Aim:

To Model and Analyze an Isolated Footing and Pile Foundation for the given Loading details using SAFE software and check for Permissible Limits as per Code.

Theory:

• The Isolated Footing is used in cases where there is enough Soil Bearing Capacity to support the Foundation.
• The Pile foundation is used in cases where there is not enough Soil Bearing Capacity to support the Isolated Footing so we go with Pile Foundation.
• The specifications of the Isolated Footing and the Pile foundation Detailing is given in IS 2911 Part-2 & SP 24.

Procedure:

1. Isolated Footing:

• Open the SAFE software and give the Grid details as per the given details.
• Define the Material Properties of Concrete and Rebar Steel.
• Define the Slab Details for Column and Foundation.
• Define the Soil Subgrade Property Data.
• Now model the Foundation and Column on the Grid created with respective dimensions for the Column and Foundation.
• Define the Load combinations for Ultimate and Servicability Limits.
• Now Define Material Property Design Data.
• Add the Loads to the Column joint for both Dead and Live Loads.
• Check in 3D view whether the loads are given or not.
• Give the Design Strips in the Both directions Horizontally and Vertically with respective Design Strip Width.
• Analyze the Model for the given Load combinations.
• Check the results for Punching Shear, Settlement and Bearing Pressure.
• Also go through the Shear Force and Bending Moment for the Design Strips.

2. Pile Foundation:

• Open the SAFE software and give the Grid details as per the given details.
• Define the Material Properties of Concrete and Rebar Steel.
• Define the Slab Details for Column, Piles and Pile Cap.
• Define the Spring Property as per the Formula based on the Length of the Pile.
• Now model the Foundation and Column on the Grid created with respective dimensions for the Column, Piles and Pile Cap.
• Define the Load combinations for Ultimate and Servicability Limits.
• Now Define Material Property Design Data.
• Add the Loads to the Column joint for both Dead and Live Loads.
• Check in 3D view whether the loads are given or not.
• Give the Design Strips in the Both directions Horizontally and Vertically with respective Design Strip Width.
• Analyze the Model for the given Load combinations.
• Check the results for Punching Shear, Settlement and Bearing Pressure.
• Also go through the Shear Force and Bending Moment for the Design Strips.

Result:

The Isolated Footing and Pile Foundation have been Modelled and Analyzed using the SAFE software. The results are checked with respect to specifications.

The Files are attached for reference.