What is STAIR?

A flight of stair, stairway, or essentially steps, is a development intended to connect a huge vertical distance. Steps might be straight and round, or may comprise of at least two straight pieces associated at points. It is an important part of a multi-floor building. So the constructor makes it sure that the steps is all okay. In todays topic we are going to discuss the important parts about stairs and it’s type, use and some math’s about them.

Design

The simplest form of R.C.C. stair case consists of an inclined slab supported at the ends upon beams or walls or ground foundation, such a stair slab is usually designed as a simple slab with a span equal to the horizontal distance between two supports. Main reinforcement at the bottom like one way slab design and temperature reinforcement rods placed usually one rod to each trade i.e. generally 10 inch c/c is used only to assist the distribution of the load. It is better to keep the unsupported span of stair slab reasonably short. If the span is long and exceeds unnecessarily, a beam can suitably provide to shorten the span of stair slab for economic purpose.

• In public buildings the rise is about 15 cm (6 in) and in residential buildings rise may very from 15 to 18 cm (6 to 7 in)
• The engineers keep tread in public buildings about 30 cm (12 in) and in residential buildings the tread may very from 20 to 30 cm (8 to 12 in)
• The constructor keep sum of tread plus twice the rise about 60 cm (24 in)
• The engineers keep product of tread and rise in cm between 400 to 450 (in inch 160 to 180)

Read more detail about stairs in: 
- architecturaldigest.com Here
- keuka-studios.com Here
- theconstructor.org Here

Types of Stair-Cases:

1. Straight.
2. Quarter Turn.
3. Half Turn / Stairs of Two Flights ( a. Dogleg Type, b. Open Newel Type )
4. Stair Cases of Three Flights ( a. Half Turn and b. Three Quarter Turn  )

Math’s problem:

Now we will see some problems about stair and try to solve them. The detailed sheet is here with and you can download them.

Download full PDF from here —->>>

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