Common types of stairs for building
Generally, the stairs are categorized as follow :-
1. Straight stairs, 2. Quarter turn stairs, 3. Half turn stairs, 4. Three quarter turn stairs, 5. Circular stairs, 6. Spiral stairs, 7. Curved stairs, 8. Geometric stairs, 9. Bifurcated stairs and, 10. Combination above types
1. STRAIGHT STAIRS: In these types of stairs, no modification occurs in direction on any flight among two consecutive floors. The straight stairs are classified as follow :-
a. Straight run with a single flight between floors
b. Straight run with a series of flight without change in direction
c. Parallel stairs
d. Angle stairs
e. Scissors stairs
In straight stairs, the modification may occur in direction at an intermediate landing. In angle stairs, the consecutive flights remain at an angle to each other. Scissor stairs are formed with a pair of straight runs in opposite directions and arranged on opposite sides of a fire defiant wall.
2. QUARTER TURN STAIRS: These types of stairs are arranged if it is required to modify the direction of flight with 900. The modification in direction is impacted by either creating a quarter space landing or by arranging winders at the junctions.
3. HALF TURN STAIRS: Under these types of stairs, their direction is modified by 1800. It comes up with either dog-legged or open newel type. For dog legged stairs, the flights are arranged in opposite directions and there is no space among the flights in plan. Alternatively in open newel stairs, there exist a well or opening among the flights and it is useful to hold a lift. These stairs are mostly suitable for the places having adequate spaces.
4. THREE QUARTER TURN STAIRS: In these types of stairs, their directions are modified by 2700. On the contrarily direction is modified three times with its upper flight crossing the bottom one. In this type of construction an open well is formed.
5. CIRCULAR STAIRS: These stairs comprise of a single centre of curvature and large radius & seem to follow circle if viewed from above. These stairs are normally provided at the backside of a building to allow entry for servicing at different floors. All the steps spread from a newel post in the form of winders. These stairs are built up in stone, cast iron or R.C.C.
6. SPIRAL STAIRS: These stairs have similarity with circular stairs apart from that the radius of curvature is small and the stairs are supported with a center post. Entire diameter of such stairs may vary from 1 to 2.5 m.
7. CURVED STAIRS: These stairs seem to follow a curve having two or more centre of curvature if viewed from above, appear to follow a curve with two or more centre of curvature, such as ellipse.
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