What is a Raft Foundation?

Types of Foundation

1. Shallow foundations
2. Deep foundations.
   • Spread Foundation (Isolated Footings),
   • Wall Foundation, 
   • Raft Foundation.

1. Shallow Foundation:

• In which pr = depth of foundation below ground level, &
• B = width of foundation (last dimension).

2. Deep Foundations.

2.1. Spread Foundation (Isolated Footings),

2.2. Wall Foundation

2.3. Raft Foundation

• Rectangular Combined Foundation
• Trapezoidal Combined Foundation
• Strap Foundation
• Common Types of Raft Foundations

2.3.1. Raft Foundation: Rectangular Combined Foundation

• Determine the area of the foundation

• • Q1,Q2 = Column loads
  • QNet all = Net allowable soil bearing capacity

2.3.2. Raft Foundation: Trapezoidal Combined Foundation

2.3.3. Raft Foundation: Strap footing

2.3.4. Raft Foundation: Common Types of Raft Foundations

Types of Raft Foundation

• Solid Slab Raft, 
• Plain Raft,
• Flat Rafts,
• Mats,
• Wide Toe Rafts,
• Slip Plane Rafts,
• Blanket Rafts, 
• Slab Beam Raft,
• Cellular Raft.

Different Types of Raft Foundation:

• A slab with constant thickness usually referred as a flat slab type raft foundation.
• A slab-beam type raft foundation.
• A Cellular type raft foundation.

Raft Foundation

When Would a Raft Foundation Be Used?

What Is the Minimum Depth of Raft Foundation?

What Is the Meaning of Raft Footing?

Why Raft Foundation Is Required?

Where Are Raft Foundations Used?

Where Can We Use Raft Foundation?

How Do Raft Foundations Work?

• Isolated Foundation
• Core Cutter Method
• Different Cement Types
• Drilled Piers Foundation
• IS 1200 Important Point Part-2
• Hip Roof Vs Gable Roof | What Is Gable Roof | What Is Hip Roof
• Difference Between Formwork, Shuttering, Centering, Staging & Scaffolding
• What Is Cantilever | What Is Cantilever Footing | Design of the Cantilever Footing
• Difference Between Plane Surveying and Geodetic Surveying |What Is Geodetic Surveying | What Is Plane Surveying
• Difference between Construction Joint and Expansion Joint | Types of Movement Joints | Why Required Movement Joint In Concrete