27/05/2026
This staircase design is a reinforced concrete and steel structure meant for durability and safety. Let’s break down the important details:
Structural Layout
- Total rise: 3600 mm, achieved with 16 risers (including 5 winders).
- Riser height: 225 mm, slightly steep but acceptable for service stairs.
- Tread width: 250 mm, giving a compact footprint.
- Waist slab: 150 mm thick RCC slab supporting the steps.
- Stair width: 1000 mm clear, suitable for single-user passage.
Reinforcement Details
- Ground beam (L-1): 230 mm wide, reinforced with 4 bars of 16 mm at top and bottom, stirrups 8 mm @150 mm c/c.
- Landing beam (L-2): Same reinforcement as ground beam, ensuring continuity.
- Landing slab (L-3): 150 mm thick, reinforced with 10 mm bars @150 mm c/c both ways.
- Footing F1: 1200 mm wide, reinforced with 12 mm bars top and bottom, stirrups 8 mm @150 mm c/c.
- Footing F2: 1500 mm wide, heavier reinforcement with 18 mm bars and 12 mm @150 mm c/c.
Materials
- Concrete grade: M25 (fck = 25 MPa).
- Steel grade: Fe 420 (fy = 420 MPa).
- Clear cover: 25 mm for durability against corrosion.
Design Check
- Formula used: \(2R + T\).
- Here, \(2 \times 225 + 250 = 700\) mm, which is slightly above the recommended 600–630 mm range. This makes the staircase steeper, suitable for service or space-constrained areas rather than public use.
Key Notes
- All dimensions follow IS 456:2000 standards.
- Reinforcement ensures stability against loads and vibrations.
- Proper footing and beam detailing provide safe load transfer to the foundation.
- Clear cover ensures long-term durability by protecting steel from moisture.
This design balances compactness with strength, making it ideal for secondary staircases in buildings where space is limited but safety is still a priority.
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