Seminar on staircase… --Santhoshkumar. M

STAIRS “A set of steps leading from surface of a building to another surface, typically inside the building is termed as Stairs.

WHY STAIRS? Nothing just to facilitate access during movement from one level to another in a building.

Parts of stairs 1. Step : 2. Tread : 3. Riser : 4. Handrail : It is a portion of stair which permits ascent & descent. 2. Tread : It is the upper horizontal portion of step upon which the feet is placed. 3. Riser : The vertical portion between each tread on the stair. 4. Handrail : A handrail is a rail that is designed to be grasped by the hand so as to provide stability or support 5. Baluster : It is vertical member of wood or metal supporting the handrail.

6. Newel post : 7. Run : 8. Nosing : 9. String Or Stingers : This is the vertical member which is placed at the ends of flights to connect handrail . 7. Run : It is the total length of stairs in a horizontal plane, including landings. 8. Nosing : It is the projecting part of the tread beyond the face of the riser. It is rounded to give good architectural effect. 9. String Or Stingers : These are the sloping wooden members which support the steps in a stair .They run along the slope of the stair.

Classification of stairs

Based on types of material 1. Wooden Stair 2. Stone Stair 3. Steel Stair 4. Reinforced Concrete Stair 5. Brick stair

Wooden stair

Stone stair

Steel stair

Reinforced concrete stair

Brick stair

Glass stair

Types of stairs 1. Straight Stair 2. Dog legged Stair 3. Quarter turn Stair 4. Open newel Stair 5. Three quarter turn Stair 6. Bifurcated Stair 7. Geometrical Stair 8. Circular Stair

Straight stair •These are the stairs along which there is no change in direction on any flight. •It is used where stair case hall is long and narrow

Dog leged stair •It consists of two straight flights of steps with abrupt turn between them. A level landing is placed across the two flights at the change of direction. •This type of stair is useful where the width of the staircase hall is just sufficient to accommodate two width of stair.

Quarter turn stair •A stair turning through one right angle is known as quarter turn stair. •The change in direction can be affected by either introducing a landing or by providing winders

Open newel stair •In these type of stair there is a well or opening between the flights in plan. •This well may be rectangular or of any geometrical shape and it can be used for fixing lift.

Three quarter turn stair •A stair turning through right angles (270 degree) is known as three quarter turn stair. •In this case an open well is formed

Bifurcated stair •These stair are so arranged that there is a wide flight at the start which is further sub-divided into two narrow flights at the midlanding. •The two narrow flight starts from either side of the mid-landing. •These stairs are suitable for modern sub building.

Spiral or circulated stair It is known as spiral stair. When viewed from top it appears to follow a circle with a single centre of curvature. The spiral stairs are provided where space available is limited and traffic is low. These stairs can be constructed in R.C.C., Steel or Stone

Thank u… “you cant connect dots by looking forward… you can only connect it by looking backwards… so keep looking…” --steve jobs