Raft foundation are generally preferred to when the area required for individual footing, is more than

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

A

$${\text{D}} = \frac{{{\text{W}}\left( {{\text{a}} - {\text{b}}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

B

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

C

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{8{{\text{a}}^2}{\text{bq}}}}$$

D

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{\text{abq}}}}$$

A raft foundation is provided if its area exceeds the plan area of the building by

A

10%

B

20%

C

40%

D

50%

The loose pockets in soil mass can be bridged safely by providing a raft foundation provided the soft area is smaller than

A

The column spacing

B

One-third the column spacing

C

Half the column spacing

D

Three-fourth the column spacing

সাধারণত MAT foundation উপযোগী বিবেচনা করা হয়, যখন Individual footing এর আয়তন সমগ্র আয়তনের - এর বেশী হয়।

A

২৫

B

৩০

C

৪০

D

৫০

The maximum total settlement for raft foundation on clayey soils should be limited to

A

25 mm

B

25 to 40 mm

C

40 to 65 mm

D

65 to 100 mm

If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

A

Square

B

Rectangular

C

Trapezoidal

D

Triangular

L is older than M and taller than N. O is younger than P, older than N and shorter than Q. R is older than S, younger than N, shorter than S and taller than Q. S is older than L, M, O, P, Q, R and S is necessarily false?

A

O is the shortest of the group.

B

N is the second tallest of the group.

C

L is the tallest of the group.

D

Q is the third oldest of the group.

The raft slab is projected beyond the outer walls of the structure by

A

5 to 10 cm

B

15 to 20 cm

C

25 to 30 cm

D

30 to 45 cm

Raft foundations are used for:

A

Providing increased area of foundation over poor bearing capacity of soil

B

Spanning over small soft or loose pockets

C

Counter acting the hydrostatic effect

D

All the above

There are five statements given below: i. karim earns more than Rahim but less than Raihan ii. Tarique earns more than Farid iii. Rahim earns more than Rariq iv. Raihan and Rarique earn equal amounts v. Farid earns the least amount which of the above statements prove that Tarique earns more money than Rafiq?

A

I, II and III

B

II, III and IV

C

III, IV and V

D

I, III and IV

Raft foundation are generally preferred to when the area required for individual footing, is more than

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