Foundation Design using SAFE

Foundation Design using SAFE

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.

Aim:

• To Analyze and design the isolated footing from week 11 challenge on SAFE
• To verify the size, depth and steel provided as per calculations.

Introduction:

• CSI SAFE (slab analysis by the finite element method) is the best tool for designing concrete slabs and foundations.
• SAFE provide easiness to engineer towards the safe design of structures with powerful tools like draw, analyze, design and detailing etc.
• Laying out models is quick and efficient way with the user-friendly drawing tools, or user can import model from AutoCAD or loading conditions from other software’s like CSI ETABS & CSI SAP2000.

Procedure:

Step:1

• Open the SAFE Application.
• Select New model.
• Followed by the input settings, Units was selected as metric & code IS 456-2000.
• 
  

ESULT:

The Isolated footing was designed and analyzed using SAFE software successfully.

Safe bearing capacity under service load is 152 KN/m2, Hence OK.

• Two-way shear is 0.79, Hence OK.
• Ultimate Bending moment & shear force check done successfully.
• Flexural Reinforcement design for Footing slab done successfully.

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

Column size = 600 x 600 mm

Unfactored load = 1175 KN

Pile length = 16m

Pile diameter = 500 mm

Load carrying capacity = 200 KN.

Calculations.

Number of pilers = 1175 / 200 = 5.6 = 6

Spring constant = ExA / L

Where, E = 25000 N/mm²

A = `(pi/4)`(500)² = 196375 mm²

L = 16000 mm

Spring constant =25000 x 196375 / 16000=306835 N/mm or 306835 KN/m

Edge spacing is taken as 200 or 300 mm.

RESULT:

• Complete design of pile cap foundation using SAFE software is done successfully.
• Max displacement was found as shown, So its Safe.
• All the punching shear values are less the 1, So its Safe.
• Ultimate Bending moment & shear force check done successfully.
• Flexural Reinforcement design for slab done successfully.