Foundation Design using SAFE
OBJECTIVE OF CHALLANGE
to know the general design procedure of spreadnfooting with safe foftware
to know the general design procedure of pile foundation with safe software
PROCEDURE
FIND THE value for
SAFE BEARING CAPACITY UNDER SERVICE LOAD SETTELMENT UNDER SERVICE LOAD two way shear checkULTIMATE BENDING MOMENT(moment and shea)
FLEXUARAL REINFORCEMENT DESIGN FOR FOOTING all these are find out and the result take check the column safe or not
DATA REQUIRED FO SAFE ANALYSIS &DESIGN
unfactored load =2000/1.5=1333.3kN
dead load break up =1333.3/2=666.7kN
live load break up =1333.3/2=666.7kN
Subgrade modulus for the soil =safe bearing capacity *factor ultimate / max settelment=150*3/0.05=k=9000kN/M3
rebar yeild strenght (fy)=500N/mm2
rebar ultimate strength=say 575N/mm2
elastic modulus of M25 CONCRETE =25000N/mm2
Q1)
SAFE BEARING CAPACITY UNDER SERVICE LOAD
DEFLECTION AT CENTER 146kN/m3
2)SETTELMENT UNDER SERVICE LOAD
MAX DEFLECTION IS 60mm
3)two way shear check
shear stress less than capacity so we dont have any problem section pass in two way check
4)ULTIMATE BENDING MOMENT
SHEAR REINFORCEMENT
3)FLEXUARAL REINFORCEMENT DESIGN FOR FOOTING
Q2)
ANS:DATA REQUIRED FOR SAFE nalysis and design
unfactored load =1175kN
dead load break up =1175/2=666.7kN
live load break up =1175/2=666.7kN
point spring of pile=A*E/L
=196349*25000/16000=306796kN/M
K for safe analysis
rebar yeild strenght (fy)=500N/mm2
rebar ultimate strength=say 575N/mm2
elastic modulus of M25 CONCRETE =25000N/mm2
DATA REQUIRED FOR SAFE ANALYSIS&DESIGN
num of piles required=unfactored loadwith self weight addition / indiduak pile capacity
=1175*1.1/200=6.5
consider 8 piles for symetric placement of pile under pile cap
take center to center distance between pile 3*pile diametre (1500mm)
edge distance from pile centre =1* pile dia (500mm)
assuummee pile cap depth 500mm
PROCEDURE
we have taken pile material and column material as a stiff material
central overall pile is slab material
point load is distributed only at centre not unoform
SETTELMENT UNDER SERVICE LOAD
MAX DEFLECTION IS 1mm
2)FLEXURAL MOMENT
RESULT: IN THE GIVEN 2 AL ARE FIND OUT AND THE DESIGN IS SAFE