Challenge

Foundation Design using SAFE

BBhagyashri Marodkar3 Mar 2022

Q.1)

Aim - To analyze and design the isolated footing from week 11 challenge

Procedure -

Open SAFE application and Select new model
Select units as metric and IS code as IS 456-2000

Subgrade modulus = SBC X FOS /Settlement = 150X3/0.05 = 9000kn/m^3
Unfactored load = 2000/1.5 =1333.3 kn
Dead load = 1333.3/2 = 666.7 kn
Live load = 1333.3/2 = 666.7 kn

Step 2 -

Add material property
Add M25 grade of concrete
E = 25000 n/mm^2

Add fe 500 for rebar

Step 3 -

Add slab properties
For footing

For mat

For stiff

Step 4 -

Add soil subgrade modulus

Step 5 -

Assign point load

Step 6 -

Assign load combinations

Step 7 -

Run the analysis

Step 8 -

Deformed shape

Step 9 -

Check for Reactions

Step 10 -

Check for Flexural reinforcement for footing slab

Step 11 -

Check for punching shear

Step 12 -

Check for slab design

Q. 2)

Aim - To model analysis and design the pile cap

Procedure -

Column size - 600x600mm

Pile length - 16m

Pile diameter - 500mm

Unfactored load - 1175 kn

Load carrying capacity - 200kn

E - 25000 n/mm^2

Number of piles = 1175/200 = 5.8 =6

Spring constant = ExA/L = 25000x196349/16000 = 306795 kn/m

Edge distance = 300mm

Step 1 -

Open SAFE application
Then select new model
Select IS code as 456-2000, and units as metric