# m9l20 - Module 9 Staircases Version 2 CE IIT, Kharagpur...

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Module 9 Staircases Version 2 CE IIT, Kharagpur

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Lesson 20 Types and Design of Staircases Version 2 CE IIT, Kharagpur
Instructional Objectives: At the end of this lesson, the student should be able to: classify the different types of staircases based on geometrical configurations, name and identify the different elements of a typical flight, state the general guidelines while planning a staircase, determine the dimensions of trade, riser, depth of slab etc. of a staircase, classify the different staircases based on structural systems, explain the distribution of loadings and determination of effective spans of stairs, analyse different types of staircases including the free-standing staircases in a simplified manner, design the different types of staircases as per the stipulations of IS 456. 9.20.1 Introduction Staircase is an important component of a building providing access to different floors and roof of the building. It consists of a flight of steps (stairs) and one or more intermediate landing slabs between the floor levels. Different types of staircases can be made by arranging stairs and landing slabs. Staircase, thus, is a structure enclosing a stair. The design of the main components of a staircase-stair, landing slabs and supporting beams or wall – are already covered in earlier lessons. The design of staircase, therefore, is the application of the designs of the different elements of the staircase. Version 2 CE IIT, Kharagpur

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9.20.2 Types of Staircases Figures 9.20.1a to e present some of the common types of staircases based on geometrical configurations: (a) Single flight staircase (Fig. 9.20.1a) Version 2 CE IIT, Kharagpur
(b) Two flight staircase (Fig. 9.20.1b) (c) Open-well staircase (Fig. 9.20.1c) (d) Spiral staircase (Fig. 9.20.1d) (e) Helicoidal staircase (Fig. 9.20.1e) Architectural considerations involving aesthetics, structural feasibility and functional requirements are the major aspects to select a particular type of the staircase. Other influencing parameters of the selection are lighting, ventilation, comfort, accessibility, space etc. 9.20.3 A Typical Flight Figures 9.20.2a to d present plans and sections of a typical flight of different possibilities. The different terminologies used in the staircase are given below: Version 2 CE IIT, Kharagpur

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(a) Tread: The horizontal top portion of a step where foot rests (Fig.9.20.2b) is known as tread. The dimension ranges from 270 mm for residential buildings and factories to 300 mm for public buildings where large number of persons use the staircase. (b) Nosing: In some cases the tread is projected outward to increase the space. This projection is designated as nosing (Fig.9.20.2b). (c)
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## This note was uploaded on 03/17/2012 for the course CENG 3012 taught by Professor Prof.j.n.bandopadhyay during the Summer '01 term at Indian Institute of Technology, Kharagpur.

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m9l20 - Module 9 Staircases Version 2 CE IIT, Kharagpur...

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