Foundation Design using SAFE
- Model the isolated footing provided in week 11 challenge on SAFE. Analyze and design it to verify the size, depth and steel provided as per calculations.
Square footing for a columnsize of 400x400
Compression axial lad combination of (1.5 DL+1.5 LL)
The safe soil bearing capacity is 150 KN/m2
Assume M25 concrete grade
Unfactored load = 1333.33kn
Dead load = 666.7kn
Live load = 666.7KN
Sub grade modulus for soil = 150*3/0.05 = 9000KN/m3
Rebar yield strength = 500N/mm2
Rebar ultimate strength = 575N/mm2
Elastic Modulus of concrete = 25000 N/mm2
2. A column of size 600x600 carrying an unfactored gravity load (DL+LL) of 1175 KN is to be supported on pile cap, which ultimately transfers load to the piles underneath. Piles of 16 metres length and 500 mm diameter are to be used. Each pile has a load carrying capacity of 200 KN. 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
Note: Participants must refer to IS 2911 (part 2) and SP 34 for 2nd challenge
Unfactored load = 1175kn
Dead load breakup = 587.5kn
Live load break up = 1175/2 = 587..5KN
Point spring pile =A x E/L
196349X25000/16000 = 306.8KN/mm
Rebar yield strength = 500N/mm2
Rebat ultimate Strength = say 575N/mm2
Elastic modulus of M25 concrete = 25000N/mm2