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Test: Footing & Rafts - 2 - Civil Engineering (CE) MCQ


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5 Questions MCQ Test Foundation Engineering - Test: Footing & Rafts - 2

Test: Footing & Rafts - 2 for Civil Engineering (CE) 2024 is part of Foundation Engineering preparation. The Test: Footing & Rafts - 2 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Footing & Rafts - 2 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Footing & Rafts - 2 below.
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Test: Footing & Rafts - 2 - Question 1

The least horizontal dimension of plain concrete pier should not be less than _____of its height.

Detailed Solution for Test: Footing & Rafts - 2 - Question 1

Plain Concrete pier:

  • The height of the pier shall not exceed 6 times the least lateral dimension.
  • When the height exceeds 6 times the least lateral dimension, the buckling effect shall be taken into account, but in no case shall the height exceed 12 times the least lateral dimension.
  • The minimum horizontal dimension of the pier shall be 2 feet and should not less than 1/12 times its height.
Test: Footing & Rafts - 2 - Question 2

Given the size of column as 200 mm × 400 mm and soil bearing capacity of 150kN/m2. Assuming the concrete grade of M20 and Fe 415 and total weight as 330 kN, calculate the area of footing.

Detailed Solution for Test: Footing & Rafts - 2 - Question 2

Concept:
The area of footing (Af) is given by

Calculation:
Given:
Load = 330 kN, Self weight = 10% of Given Load = 0.1 × 330 = 33 kN
Total Load = 330 + 33 = 363 kN
Safe bearing capacity = 150 kN/m2

Test: Footing & Rafts - 2 - Question 3

During design of Raft foundation according to IS code, the maximum settlement in sand and hard clay for reinforced concrete structures is:

Detailed Solution for Test: Footing & Rafts - 2 - Question 3

Explanation:
(i) For an isolated foundation on clayey soil, max allowable settlement is 75 mm as per IS 1904.For sands & hard clay it is only 50 mm.
(ii) For rafts founded on sands & hard clay it is limited to 75 mm whereas for soft clays it is allowed upto 100 mm.
Additional Information
For Differential Settlement:
(i) In Sand ⇒ 25 mm
(ii) In Clay ⇒ 40 mm

Test: Footing & Rafts - 2 - Question 4

The foundation whose length is considerable greater than its width is:

Detailed Solution for Test: Footing & Rafts - 2 - Question 4

Strip footing: 
A strip footing is another type of spread footing which is provided for a load-bearing wall. The length of strip footing is considerably greater than its width. A strip footing is also known as continuous footing.
Mat or Raft foundation: 
It is a large slab supporting a number of columns and walls under an entire structure or a large part of the structure. It is used to cover the foundation of the whole building area.
Pile foundation: 
A pile is basically a long cylinder of a strong material such as concrete that is pushed into the ground to act as steady support for structures built on top of it. It is also called a deep foundation. Depth of the pile is very much greater than that of its lateral dimension.
Confusion Point:
For pile foundation ⇒ Depth >>>>> Width
For strip footing ⇒ Length >> Width
∴ Strip Footing is the correct answer.

Test: Footing & Rafts - 2 - Question 5

If q is the punching shear resistance per unit area, a is the side of square footing for a column side b, carrying a weight W including the weight of footing, the depth of footing (D) considering the punching shear resistance is

Detailed Solution for Test: Footing & Rafts - 2 - Question 5

For weight 'W', stress (load per unit area) (σ) is given by = W/a2
Critical section for punching shear occurs at d/2 from the face of the column.
∴ Punching shear resistance (Force) is given by:

∴ Punching shear stress per unit area is given by: 
From the given data, punching shear resistance is denoted by q

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