Foundation Design using SAFE

AIM:

To Analyse and design the isolated footing from week 11 challenge and design a Pile cap system on SAFE. To verify the size, depth and steel provided as per calculations.

Question 1:

To design the isolated footing

Procedure:-

Setting the Design preferences as below:

Calculating the DL, LL and subgrade modulus of soil as below:

Defining the M25 concrete properties as below:

Defining the property of Fe-500 rebar as below:

Defining the footing property as below:

Defining the Stiff property as below:

Defining subgrade properties of soil as below:

Adding load patterns as below:

Adding load combinations as below:

Running the analysis.

Result:

From the result, it can be observed that the deformation is well within the safe limit of 50 mm.

From the result, it can be observed that the soil pressure is within the safe limit of 150 KN/m^2.

Question – 2: To Design the Pile cap

Setting the Design preferences as below:

Initialising the Grid system as below:

Defining the material M25 concrete and Fe 500 steel as below:

Defining the slab property for Pile cap, Pile and Column as below:

Defining the point spring property of Piles as below:

Defining the load patterns as below:

Defining the load cases as below:

Defining the load combinations as below:

Drawing the piles of 500 mm dia as below with edge distance of 500 mm and c/c distance of 1250 mm

Assigning the property of point spring to all the piles as below:

Drawing the pile cap as below:

Drawing the column of size 600 X 600 mm as below:

Assigning Dead load and Live load of 587.5 KN as below:

Running the analysis and checking the settlement of the pile cap:

The maximum settlement observed is 1.2 mm which is well within the allowable limit of 50 mm. Hence safe.

Checking the Punching shear capacity of the pile cap:

The maximum observed value is 0.3562 which is well within the allowable ratio of 1. Hence safe.

Checking the reaction forces on the piles:

The maximum reaction observed is 290 KN which is more than allowable capacity of pile i.e., 200 KN. Hence no. of piles may be increased.

Adding the Design strips in both X and Y directions as below:

Reinforcement details for the Design strip: