Presentation on staircase by student of Faridpur Engineering College, Faridpur, Bangladesh

1. STAIRS

2. DEFINITION
“A Stair is a series of steps
with or without landings or
platforms, which is installed
between two or more floors of
a building to bridge a large
vertical distance”
.

3. TECHNICAL TERMS
The various technical
terms used in stairs
are as follows:

4. 1. Step: The portion of stair which
permits ascend or descend.
It is composed of Tread and Riser.
2. Tread: horizontal portion of a step
3. Riser: vertical portion of a step
4. Rise: It is the vertical distance
between two successive tread faces.

5. 5. Flight: A series of steps without
any platform or landing or break in
their direction.
6. Landing: It is the level platform at
the top or bottom of a flight
between the floors

6. 7. Going: It is the horizontal distance
between two successive riser faces.
8. Nosing: It is the projecting part of the
tread behind the face of the riser.
It is rounded to give good architectural
effect
9. Winders: They are tapering steps used
for changing the direction of a stair.
10. Scotia: It is a moulding provided
under the nosing to improve the
elevation of the step, and to provide
strength to nosing.
11. Soffit: It is the underside of a stair.

7. Staircase Design Principles
1. Provide access from one floor of a building to another floor.
2. In case of emergency, Stair is needed to exit though lift is there

8. Types of Stairs:
We have more types of
staircase. But we will here
explain some main types of
stairs.
 1.Straight stair
 2. Half turn stairs
 3. Circular stairs
 4. Three quarter turn stairs
 5. Spiral stairs
 6. Bifurcated stairs

9. 1.Straight Stairs:
•No change in direction
•Siplest form of stair
•May consist of one or more
flight
•Generally use for the small
house and for the single
flight or double.

10. 2.Half turn stair:
Half turn stairs can change their
direction on 180 degree. and
these kind of stair his more 3
types.
•Dog legged Stair
•Open newel Half turn stair
•Geometrical half turn stairs

11. 3. Circular stairs:
Circular stairs can give us the
view from top of this stair same
like Circle therefore its called
circular stairs. and this types of
stairs can be design in those
building where we don’t have the
place, and some time its design
to make the building attractive,
and this types of stairs are
construct from the RCC and Cast
iron.

12. 4. Three quarter turn stairs:
This types of stair direction is
changed three times . and its
become turn in three quarters.
this is the open newel stairs and
this types of staircase should be
design when the vertical
distance between two floor is
more than we have to design
three quarter turn stairs

13. 5. Spiral stairs:
These stairs are similar to
circular stairs except that the
radius of curvature is small and
the stairs may be supported by a
center post. Overall diameter of
such stairs may range from 1 to
2.5 m. this types of stairs are
same like circular shape.

14. 6. Bifurcated stairs:
A. Used in public building
and special for the
entrance hall
B. Wide flight is start which is
sub-divides into narrow
flight at the mid landing
which turning to left and
right at landing.

16. Constructions of Stair
Stairs are constructed with
any of the following
materials.
1.Brick masonry,
2.Stone masonry,
3.Timber,
4.Steel,
5.Reinforced Cement
6.Concrete

17. The following are the characteristics of a
good stair.
 Easy access from all sides of the
building
 Well ventilated
 Wide landing at end of each flight
 Not more than 12 steps in a flight.
 The rise and go of the steps should be
so proportioned that the ascending
and descending of the flight is easy.
 Hand rail must be provided at least on
one side of the stair
 The inclination should be between 30
to 45 degrees.

18. Why do we need Stairs?
To protect people from
injury and to facilitate
access during movement
from one level to another.

19. PRESENTED BY
Group : G

20. 1446: Tanushree Nisha
1447: Arifur Rahman
1448: Imran Sarwar
1449: MD. Mahdi Hasan
Saikot
1450: Faizur rahman Sajib
1451: Raihan Rana
1452: A,K,M, Fazla Rabby
1453: Agatha Aunna Mondol

21. thanks!
For more:
https://theconstructor.org/structures/types-of-arches-construction/11960/
https://en.wikipedia.org/wiki/Arch#Types_ of_ arches
https://www.merriam-webster.com/dictionary/arch
http://encyclopedia2.thefreedictionary.com/one-centered+arch