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# Reinforced Concrete Slabs: One-way Slabs Notes | EduRev

## : Reinforced Concrete Slabs: One-way Slabs Notes | EduRev

``` Page 1

Module
8

Reinforced Concrete
Slabs
Version 2 CE IIT, Kharagpur

Page 2

Module
8

Reinforced Concrete
Slabs
Version 2 CE IIT, Kharagpur

Lesson
18
One-way Slabs

Version 2 CE IIT, Kharagpur

Page 3

Module
8

Reinforced Concrete
Slabs
Version 2 CE IIT, Kharagpur

Lesson
18
One-way Slabs

Version 2 CE IIT, Kharagpur

Instructional Objectives:

At the end of this lesson, the student should be able to:

• state the names of different types of slabs used in construction,

• identify one-way and two-way slabs stating the limits of  l
y
/l
x
ratios for one
and two-way slabs,

• explain the share of loads by the supporting beams of one- and two-way
slabs when subjected to uniformly distributed vertical loads,

• explain the roles of the total depth in resisting the bending moments,
shear force and in controlling the deflection,

• state the variation of design shear strength of concrete in slabs of different
depths with identical percentage of steel reinforcement,

• assume the depth of slab required for the control of deflection for different
support conditions,

• determine the positive and negative bending moments and shear force,

• determine the amount of reinforcing bars along the longer span,

• state the maximum diameter of a bar that can be used in a particular slab
of given depth,

• decide the maximum spacing of reinforcing bars along two directions of
one-way slab,

• design one-way slab applying the design principles and following the
stipulated guidelines of IS 456,

• draw the detailing of reinforcing bars of one-way slabs after the design.

Version 2 CE IIT, Kharagpur

Page 4

Module
8

Reinforced Concrete
Slabs
Version 2 CE IIT, Kharagpur

Lesson
18
One-way Slabs

Version 2 CE IIT, Kharagpur

Instructional Objectives:

At the end of this lesson, the student should be able to:

• state the names of different types of slabs used in construction,

• identify one-way and two-way slabs stating the limits of  l
y
/l
x
ratios for one
and two-way slabs,

• explain the share of loads by the supporting beams of one- and two-way
slabs when subjected to uniformly distributed vertical loads,

• explain the roles of the total depth in resisting the bending moments,
shear force and in controlling the deflection,

• state the variation of design shear strength of concrete in slabs of different
depths with identical percentage of steel reinforcement,

• assume the depth of slab required for the control of deflection for different
support conditions,

• determine the positive and negative bending moments and shear force,

• determine the amount of reinforcing bars along the longer span,

• state the maximum diameter of a bar that can be used in a particular slab
of given depth,

• decide the maximum spacing of reinforcing bars along two directions of
one-way slab,

• design one-way slab applying the design principles and following the
stipulated guidelines of IS 456,

• draw the detailing of reinforcing bars of one-way slabs after the design.

Version 2 CE IIT, Kharagpur

8.18.1   Introduction

Version 2 CE IIT, Kharagpur

Page 5

Module
8

Reinforced Concrete
Slabs
Version 2 CE IIT, Kharagpur

Lesson
18
One-way Slabs

Version 2 CE IIT, Kharagpur

Instructional Objectives:

At the end of this lesson, the student should be able to:

• state the names of different types of slabs used in construction,

• identify one-way and two-way slabs stating the limits of  l
y
/l
x
ratios for one
and two-way slabs,

• explain the share of loads by the supporting beams of one- and two-way
slabs when subjected to uniformly distributed vertical loads,

• explain the roles of the total depth in resisting the bending moments,
shear force and in controlling the deflection,

• state the variation of design shear strength of concrete in slabs of different
depths with identical percentage of steel reinforcement,

• assume the depth of slab required for the control of deflection for different
support conditions,

• determine the positive and negative bending moments and shear force,

• determine the amount of reinforcing bars along the longer span,

• state the maximum diameter of a bar that can be used in a particular slab
of given depth,

• decide the maximum spacing of reinforcing bars along two directions of
one-way slab,

• design one-way slab applying the design principles and following the
stipulated guidelines of IS 456,

• draw the detailing of reinforcing bars of one-way slabs after the design.

Version 2 CE IIT, Kharagpur

8.18.1   Introduction

Version 2 CE IIT, Kharagpur

Slabs, used in floors and roofs of buildings mostly integrated with the
supporting beams, carry the distributed loads primarily by bending. It has been
mentioned in sec. 5.10.1 of Lesson 10 that a part of the integrated slab is
considered as flange of  T- or L-beams because of monolithic construction.
However, the remaining part of the slab needs design considerations. These
slabs are either single span or continuous having different support conditions like
fixed, hinged or free along the edges (Figs.8.18.1a,b and c). Though normally
these slabs are horizontal, inclined slabs are also used in ramps, stair cases and
inclined roofs (Figs.8.18.2 and 3). While square or rectangular plan forms are
normally used, triangular, circular and other plan forms are also needed for
different functional requirements. This lesson takes up horizontal and rectangular
/square slabs of buildings supported by beams in one or both directions and

The other types of slabs, not taken up in this module, are given below. All
these slabs have additional requirements depending on the nature and

(a) horizontal or inclined bridge and fly over deck slabs carrying heavy

(b) horizontal slabs of different plan forms like triangular, polygonal or
circular,

(c) flat slabs having no beams and supported by columns only,

(d) inverted slabs in footings with or without beams,

(e) slabs with large voids or openings,

(f) grid floor and ribbed slabs.

Version 2 CE IIT, Kharagpur

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