Foundation Design using SAFE
1)
Aim :-
Analyze and design it to verify the size, depth and steel provided as per calculations using safe software.
Procedure :-
Data required forSAFE analysis and 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 x factor to Ultimate / maximum settlement
= (150x3)/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
Checks need to be performed in SAFE analysis
1. Safe bearing capacity under service load
2. Settlement under Service load
3. Two way shear check(Punching shear)
4. Ultimate bending moment
5. Flexural reinforcement design for Footing slab
Result :-
Successfully complete the Analyze and design it to verify the size, depth and steel provided as per calculations.
2)
Aim :-
Model, analyse and design the pile cap on SAFE to evaluate the following:
- Pile group to be used
- Depth of pile cap
- Longitudinal steel on top and bottom face in both directions using provided data.
Procedure :-
Data required forSAFE analysis and design
Unfactored load = 1175kN
Dead load breakup = 1175/2 = 587.5kN
Live load breakup = 1175/2 = 587.5kN
Point spring of Pile = (AXE)/L
= (196349x25000)/16000 = 306796 kN/m
k for SAFE analysis = 306.8kN/mm
Rebar yield strength(Fy) = 500N/mm2
Rebar ultimate strength(Fu) Say 575N/mm2
Elastic modulus of M25 concrete = 25000N/mm2
Number of pilesrequired = Unfactored load with self weight addition/individual pile capacity
= (1175x1.1)/200
= 6.5
Consider 8 piles for symmetric placement of piles under pile cap
Take center to center distance between piles= 3xpile diameter(1500mm)
Edge ditance from pile center = 1xpile diameter(500mm)
Assumed pile cap depth = 500mm
Tentative Placement of piles
Checks need to be performed in SAFE analysis
1. Individual pile capacity under service load
2. Settlement under service load
3. Two way shear check(Punching shear)
4. Flexural reinforcement design for Footing slab
Result :-
Successfully complete the Model, analyse and design the pile cap on SAFE to evaluate the following:
- Pile group to be used
- Depth of pile cap
- Longitudinal steel on top and bottom face in both directions