Foundation Design using SAFE

Aim:To Analyze and design the isolated footing from week 11 challenge on SAFE and verify as per calculations.

Procedure:

• Open the SAFE software
• Go to new model and enter the deatils as shown

• Calculation of subgrade modulus:

Load/settlememt

Total load= 1575

Settlememt= 25mm

So, 1575/0.025=63000

• Select single footing and enetr the details as shown an click on ok

• The column will been shown

• Add material of concrete and steel by clicking on define and select material properties, select add new materials and select the material

• Select define, section property, slab section and enter the footing details and the stiff details

• Add two load patterns such as service load and ultimate load

• Apply design strip labels

• Check the design preference cover should be min 40

• Then run analysis of the model

• Go to display strip option and select combo and ultimate load, from this we can check the behaviour

Result: The isolated footing is designed and analysed using SAFE

Aim: To model and analyse pile foundation using SAFE

Data Required

Unfactored load= 1175KN

Dead load braekup= 1175/2=587.5

Live load breakup = 1175/2=587.5

Point spring of plie= A*E/L

=196349*25000/16000=306769KN/M

K for Safe analysis =306.8 kn/m

Fy=500 N/mm2

Fu= 575N/mm2

Elastic modulus of M25 concrete =25000 N/mm2

• No of piles required= total load /bearing capacity of single pile =1175*1.1/200= 6.5 (8 nos)
• Length of the pile
• Mim c/c distance between two piles are per the code = 2.5*pile data = 2.5*500=1250
• We will adopt 1300mm for a safe design
• Distance from the edge of footing to the edge of pile = 1*pile data =1*500=500mm

Design using SAFE

• Open new model and using the grid option

• To add material go to define and select material property and add concrete and steel

• Select section properties from define and select slab properties and add column stiff and pile cap details

• Draw the slab using quick draw tool

• Assign point spring load - Click on assign -support data-point spring

• Run the analysis and che check for the result

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Result: Pile cap foundation is designed and analysed in SAFE software