Foundation Design using SAFE

q.1) data required for SAFE analysis & design -

unfactored load=2000/1.5=1333.3kn

dead load breakup=1333.3/2=666.7kn

live load breakup=1333.3/2=666.7kn

subgrade modulus for soil= safe bearing capacity* factor to ultimate/maximum settlement=150*3/0.05=k= 9000kn/m3

rebar yield strength(fy)=500n/mm2

rebar ultimate strength (fu)=say 575n/mm2

elastic modulus of M25 concrete=25000n/mm2

q.2) data required for SAFE analysis & design

unfactored load=1175kn

dead load breakup=1175/2=587.5kn

live load breakup=1175/2=587.5kn

point spring of pile= A*E/L=196349*25000/16000=306796kn/m

k for SAFE analysis=306.8kn/mm

rebar yield strength (fy)=500n/mm2

rebar ultimate strength (fu)=say 575n/mm2

elastic modulus ofM25 concrete=25000n/mm2

number of piles required= unfactored load with self weight addition /individual pile capacity= 1175*1.1/200=6.5

consider 8 piles for symmetric placement of piles under pile cap

take center to center distance between piles=3*pile dia(1500mm)

edge distance from pile center=1*pile dia(500mm)

assumed pile cap depth=500mm