Foundation Design using SAFE

1.

AIM: To Analyse and model Isolated footing as per calculations by using SAFE.

Procedure:

Open safe software

New model > input settings > metric units > IS 456-2000

SELECT Single footing

material properties

modulus of elasticity: sqrt25x5000=25000N/mm^2

add rebar

slab property

soil subgrade property

assign soil proprty

right click on footing to get the properties

assign loads

draw> draw points and then assign loads dead and live

assign load combinations

Run the analysis

as it is less than 50mm it is expected

add design strips

run the analysis and show slab designs

slab design

punching shear capacity

RESULT: Isolated footing is designed using SAFE.

2.

AIM:To design the pile cap on safe and to evaluate pile group to be used, depth of the pile cap, longitudinal steel on top and bottom face in both directions.

Procedure:

select grid option

x direction of distance 2900mm

y direction of distance 1650mm

add materials

slab properties

add slabs to the model

draw points

add piles

modified edge distance to 300mm as 200mm is not possible in placing piles of size 500mm

draw colounm of size 600x600 at the center

add springs

piles...> assign....>support data....> point springs

spring constant=EA/L

25000X196349/16000

=306.795KN/mm

Now the load are added

dead load=587.5

live load=587.5KN

RUN THE ANALYSIS

PUNCHING SHEAR CAPACITY RATIOS

incase of punching shear all values are less than 1, hence safe

JOINT REACTION DIAGRAM

reactions forces are according to the limit hence safe

reinforement detailing is done

run the analysis once again

reinforcement slab design

RESULT:

Completed design of pile cap foundation using SAFE software.