🏗️ FOOT OVERBRIDGE (FOB)

A Foot Overbridge (FOB) is an elevated structure that allows pedestrians to safely cross busy roads and railway lines.

1. Main Components

1. Foundations – Support the structure.
2. Columns/Piers – Transfer loads.
3. Girders – Support the deck.
4. Deck – Walking platform.
5. Stairs & Landings – Provide access.
6. Trusses – Ensure stability.
7. Handrails & Roof – Provide safety and protection.

2. Typical Dimensions

- Span: 12–30 m.
- Width: 3–4 m.
- Clearance: 5.5 m.
- Handrail height: 1.1 m.
- Stair tread: 250–300 mm.
- Stair riser: 150–170 mm.

3. Design Considerations

- Structural loads and stability.
- Wind and earthquake forces.
- Drainage and waterproofing.
- Safety, lighting and accessibility.

4. Construction Sequence

1. Site survey and soil testing.
2. Foundation construction.
3. Column and pier construction.
4. Girder and deck installation.
5. Staircase and roofing
6. Finishing and inspection

5. Design Codes
IRC:5, IRC:6, IRC:103, IS 456, IS 800 and IS 875

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