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 
subjected to uniformly distributed vertical loadings. 
 
 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 
magnitude of loadings in respective cases.  
 
(a) horizontal or inclined bridge and fly over deck slabs carrying heavy 
concentrated loads, 
 
(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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