Concrete Stairs Detail
This civil engineering article is written on the concrete stairs details and the precast concrete steps. The design of reinforced concrete stairs is done as slabs and it needs structural analysis of load, support and span conditions.
The concrete stairs are categorized as cast in-situ concrete stairs and pre-cast concrete stairs.
Concrete Stairs Design
- form of stair and separate treads and risers may differ as per requirements
- cantilevered designs can be made
- thorough form work and weight of construction is a vital factor to consider
- pre-cast stair elements can be used
- Useful where fire resistant construction is necessary
- The concrete stairs have similarities with timber stairs regarding the width, rise, going, headroom and the structure of the flights of steps
Building Concrete Steps
Simple reinforced concrete steps with proper form work structure depends on the following basic requirements:
- normally concrete mix M15 (1:2:4) / 20mm aggregate
- minimum “cover” to reinforcement should be 15mm or bar diameter or higher value for 1 hour fire resistance
- waist slab thickness – 100 – 250mm (based on stair type)
- mainly mild steel or tor steel reinforcement is utilized
- continuous handrail of 840 – 915mm height over pitch line is needed on both sides of stair required when stair width remains in excess of 1060mm
Benefits of building concrete stairs:
- contain fire resisting qualities
- long-lasting, strong and atheistically beautiful
- design can be made for greater widths and spans
- can be cleaned without any problem
- fewer maintenance cost
- mainly suitable for framed structures
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Proper floor finishing is necessary for both cast in-situ and pre-cast concrete stairs.
- usually the thickness of finish should be less than provided in floors
- trowelling in upper surfaces of the tread with carborundum dust, casting in rubber or fixing a special nosing cover like aluminum alloy, non-slip metals, etc.