DESIGN OF MASONRY STRUCTURES QUIZ

A 200 mm thick wall made of modular bricks is 5 m long between cross walls and 3.8 m clear height between RCC slabs at top and bottom. The slenderness ratio of the wall is

19

15

25

20

TRUE ANSWER : ?
YOUR ANSWER : ?

The mode of failure of a very short masonry member having h/t ratio of less than 4 is by

Buckling

Any of the above

Shear

Vertical tensile splitting

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys(i) Shall not exceed 12 if lime mortar is used(ii) Shall not exceed 18 if cement lime mortar 1 : 2 : 9 is used(iii) Shall not exceed 24 if cement mortar 1 : 6 is used

(i) and (ii) are correct

(i) and (ii) and (iii) are correct

(ii) and (iii) are correct

(i) and (iii) are correct

TRUE ANSWER : ?
YOUR ANSWER : ?

Minimum compressive strength in N/mm² for H1 type mortar used for masonry is

10

7.5

3

5

TRUE ANSWER : ?
YOUR ANSWER : ?

Full restraint is provided by(i) Foundation footing of a wall(ii) Timber floor spanning on the wall and anchored to the wall(iii) RCC slab with a minimum bearing of 10 cm on the wall

(i) and (iii) are correct

(i) and (ii) are correct

(i), (ii) and (iii) are correct

(ii) and (iii) are correct

TRUE ANSWER : ?
YOUR ANSWER : ?

A 200 mm thick brick masonry wall made of modular bricks carries an axial load of 30 kN/m from wall above and an eccentric load of 20 kN/m from RCC floor acting at a distance of 47.5 mm from the centre line of the wall. The resultant eccentricity ratio is

0.1

0.095

0.105

0.09

TRUE ANSWER : ?
YOUR ANSWER : ?

Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than

15 cm

10 cm

30 cm

20 cm

TRUE ANSWER : ?
YOUR ANSWER : ?

Assertion A : For eccentricity ratio exceeding 1/6, effective thickness of masonry will get reduced.Reason R : For eccentricity ratio exceeding 1/6, there will be tension on one side of the member. Select your answer according to the codes give below:

Both A and R is true and R is the correct explanation of A

A is true but R is false

A is false but R is true

Both A and R is true and R is not the correct explanation of A

TRUE ANSWER : ?
YOUR ANSWER : ?

For strengthening a 50 m long and 5 m high straight compound wall built in brick work, which one of the following would be most suitable?

Using a richer mortar

Providing a deeper foundation

Using stronger bricks

Providing buttresses at certain intervals

TRUE ANSWER : ?
YOUR ANSWER : ?

Cement mortars richer than 1 : 3 are not used in masonry because(i) There is no gain in strength of masonry(ii) There is high shrinkage(iii) They are prone to segregation

(i), (ii) and (iii) are correct

(i) and (ii) are correct

Only (ii) is correct

(ii) and (iii) are correct

TRUE ANSWER : ?
YOUR ANSWER : ?

↑