Foundation Design using SAFE

 AIM : 1. 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.

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

ANSWER 

Data required for SAFE analysis & Design

Unfactored load = 2000/1.5 1333.3 KN

Dead load breakup = 1333.3/2 = 666.7 KN Live load breakup = 1333.3/2 = 666.7 kN

Subgrade modulus for soil = Safe bearing capacity x factor to Ultimate / maximum settlement

= 150 x 3/0.05 k = 9000 kN/m3

Rebar yield strength (Fy) = 500 N/mm2

Rebar ultimate strength (Fu) = Say 575 N/mm2

Elastic modulus of M25 concrete = 25000 N/mm2