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Test: One Way Slab - Civil Engineering (CE) MCQ


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10 Questions MCQ Test RCC & Prestressed Concrete - Test: One Way Slab

Test: One Way Slab for Civil Engineering (CE) 2024 is part of RCC & Prestressed Concrete preparation. The Test: One Way Slab questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: One Way Slab MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: One Way Slab below.
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Test: One Way Slab - Question 1

Which of the following square slab will behave as one-way slab?

Detailed Solution for Test: One Way Slab - Question 1

One-way slab:
(i) If a slab is supported only on two opposite supports, it is called a one-way slab.
(ii) If the slab is opposite on all four sides and span ratio 'ly/lx > 2', it is called a one-way slab.
(iii) Main reinforcement is provided along a shorter span.
(iv) Distribution reinforcement is provided along a longer span.
(v) maximum moment in the slab is along a shorter span direction.
(vi) When simply supported along two opposite edges square slab will behave as the one-way slab.
The maximum moment for the simply supported slab is given by, 
Where lx = shorter span length 

Test: One Way Slab - Question 2

Deflection along longer span of one way slab is:

Detailed Solution for Test: One Way Slab - Question 2

One way slab is a slab which is supported by beams or walls or both on the two opposite sides to carry the load along one direction.
If it is supported on all four sides but the ratio of longer span (l) to shorter span (b) is equal or greater than 2 then it is also considered as one way slab.
Longer span/Shorter Span > 2
The one way slab will bend in one direction only i.e. in the direction along its shorter span, so it will deflect along the shorter span.
The amount of deflection along shorter span depends on load on slab and therefore, it is dynamic. However, along longer span deflection remains constant irrespective of load, so it is static in nature. 

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Test: One Way Slab - Question 3

In the design of one-way continuous slab as per IS 456:2000, the list of moment coefficients that are close to exact values of the maximum load effects can be used if –

Detailed Solution for Test: One Way Slab - Question 3

As per IS 456:2000, cl. 22.5
The moments and the shear forces for a continuous beam and one-way slab can be calculated using moment coefficients and shear force coefficients respectively only when the following conditions are satisfied:

  • Continuous spans should be at least three in number.
  • Supports should be fairly rigid and should not themselves deflect.
  • All the spans should have the same cross-sections.
  • The effective length of each span should be more or less the same and at any rate, should not differ by more than 15% of the largest effective span.
  • The loading on all the spans should be substantially uniformly distributed.
  • No redistribution of moments is permitted.
Test: One Way Slab - Question 4

In an under-reinforced one-way slab with an effective depth of 100 mm, the main steel is provided as 10 mm bars at 200 mm center to center. The moment of resistance of the slab for M-20 grade concrete and Fe-415 steel will be

Detailed Solution for Test: One Way Slab - Question 4

Moment of resistance for under reinforced beam is given by:
MOR = 0.87× fy × Ast(d - 0.42Xu)
Where, Xu = Depth of neutral axis, Ast = Area of reinforcement
Depth of neutral axis is calculated as:
Compression force = Tension force
0.36 fck b Xu = 0.87 fy Ast
Calculation:
Given,
d = 100 mm,  c/c spacing between bar = 200 mm
M20 and Fe415
Taking b = 1000 mm for slab ,Calculating Ast,

We know that,
Depth of Neutral Axis (xu):

MOR is given as:
Mu = 0.87 fy.Ast.(d - 0.42Xu)
Mu = 0.87×415× 393 (100- 0.42 × 19.6)
Mu = 141892.65 × 91.768  = 13021204.7 N-mm
Mu = 13.0 kN-m 

Test: One Way Slab - Question 5

Shear and bond stresses of Simply Supproted slabs is usually: _____.

Detailed Solution for Test: One Way Slab - Question 5

Nominal Shear stress:
IS code recommends the use of nominal shear-stress for RCC structure. The nominal shear stress in beams or slabs of uniform depth is calculated as:

Where
Vu = Shear force due to design loads,
b = breadth of beam or slab,
d = effective depth
Shear stress for slabs is very low since b is large. Therefore no shear reinforcement is provided in slabs except that the alternate bars are bent up near the supports.
Bond stress (τbd):
Bond stress is the shear stress developed along the contact surface between the reinforcing steel and the surrounding concrete which prevents the bar from slipping out of concrete.
It depends upon the grade of concrete and type of steel only.

Test: One Way Slab - Question 6

The one-way simply-supported slab for a room of plan dimensions 9 m x 4 m carries ultimate working load of 9 kN/m. The design moment for the slab should be

Detailed Solution for Test: One Way Slab - Question 6

One-way slab:
(i) If a slab is supported only on two opposite supports, it is called a one-way slab.
(ii) If the slab is opposite on all four sides and span ratio 'ly/lx > 2', it is called a one-way slab.
(iii) Main reinforcement is provided along a shorter span.
(iv) Distribution reinforcement is provided along a longer span.
(v) maximum moment in the slab is along a shorter span direction.
The maximum moment for the simply supported slab is given by,

Where lx = shorter span length 
Calculation:
Give,
Ultimate working load (w) = 9 kN/m
Shorter span length (lx) = 4 m, Longer span length (ly) = 9 m
ly/lx = 9/4 = 2.25 > 2, so it is one way slab
The maximum moment is given by, 

Design Moment = 18 kN-m

Test: One Way Slab - Question 7

Which of the following square slab will behave as one-way slab ?

Detailed Solution for Test: One Way Slab - Question 7

One-way slab:
(i) If a slab is supported only on two opposite supports, it is called a one-way slab.
(ii) If the slab is opposite on all four sides and span ratio 'ly/lx > 2', it is called a one-way slab.
(iii) Main reinforcement is provided along a shorter span.
(iv) Distribution reinforcement is provided along a longer span.
(v) maximum moment in the slab is along a shorter span direction.
(vi) When simply supported along two opposite edges square slab will behave as the one-way slab.
The maximum moment for the simply supported slab is given by,

Where lx = shorter span length 

Test: One Way Slab - Question 8

The one-way simply-supported slab for a room of plan dimensions 9 m x 4 m carries ultimate working load of 9 kN/m. The design moment for the slab should be

Detailed Solution for Test: One Way Slab - Question 8

One-way slab:
(i) If a slab is supported only on two opposite supports, it is called a one-way slab.
(ii) If the slab is opposite on all four sides and span ratio 'ly/lx > 2', it is called a one-way slab.
(iii) Main reinforcement is provided along a shorter span.
(iv) Distribution reinforcement is provided along a longer span.
(v) maximum moment in the slab is along a shorter span direction.
The maximum moment for the simply supported slab is given by,

Where lx = shorter span length 
Calculation:
Give,
Ultimate working load (w) = 9 kN/m
Shorter span length (lx) = 4 m, Longer span length (ly) = 9 m
ly/lx = 9/4 = 2.25 > 2, so it is one way slab
The maximum moment is given by, 

Design Moment = 18 kN-m

Test: One Way Slab - Question 9

The positive bending moment coefficient at the middle of the end-span of a continuous one way slab is

Detailed Solution for Test: One Way Slab - Question 9

wL= Live load
wd = Dead load
As per Table 12 of IS-456:2000, the bending moment coefficients for dead and live load are given below:

∴ Option 1 is correct.

Test: One Way Slab - Question 10

When the ratio of the long to short dimension of the slab is greater than X, the slab shall be designed as one-way slab, where X is

Detailed Solution for Test: One Way Slab - Question 10

Slabs:
Slabs are considered as plane element or plate elements which are classified based on aspect ratio.
Aspect ratio:
It is defined as ratio between longer span (Ly) of the slab to shorter span (Lx) of the slab.
Aspect ratio = Ly/Lx
Types of slab based on aspect ratio 

  • One way slab:
    Slab spanning in one direction
  • Two way slab:
    Slab spanning in both the direction

Explanation:
The ratio of the long to short dimension of the slab is greater than X
By comparing to Aspect ratio of one way slab

We get X = 2

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