DESIGN OF RAFT FOUNDATIONS - PDF

TYPES OF FOUNDATIONS

• Shallow Strip Edge Beams - For Light Loaded Buildings
• Pad - To Support Internal Columns of Buildings
• Raft - To keep Movements to a tolerable.
• Deep Driven Piles - Significant depth to competent.
• Bored Piles - Large Capacity Required.

What is RAFT FOUNDATION ?

• A Foundation System in which essentially the entire building is placed on a large continuous footing.
• Usually large concrete slab supporting many columns.
• Commonly used as foundation for silos, chimneys, large machinery.
• It is a flat concrete slab, heavily reinforced with steel, which carries the downward loads of the individual columns or walls.

TO DESIGN RAFT FOUNDATIONS

1. Determine the capacity of the foundation.
2. Determine the settlement of foundation.
3. Determine the differential settlement.
4. Determine the stress distribution beneath the foundation.
5. Design the structural component of the mat foundation using the stress distribution obtain from 4.

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