Design of Masonry Structure

This is an MCQ-based quiz on the Design of Masonry Structure.

This includes Laying bricks and blocks, Chimney building and repairs, Laying stone with mortar, or dry stacking, Pouring footings, columns, support pads, Cement repairs, and Cement coatings.

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A free standing brick wall 20 cm thick is subjected to a wind pressure of 75 kg/m². The maximum height of wall from stability consideration is

0.64 m 0.96 m 1.28 m 1.5 m

For masonry work with solid bricks, consistency of mortar should be

5 to 8 cm 9 to 13 cm 14 to 18 cm 19 to 23 cm

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

10 cm 15 cm 20 cm 30 cm

The thickness of each leaf of a cavity wall shall not be less than

5 cm 7.5 cm 10 cm 15 cm

Water retentivity for brick masonry should not be less than

50 % 60 % 70 % 80 %

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

3 5 7.5 10

For designing masonry components of a structure, seismic forces provision in the design calculation is not necessary for buildings constructed in

Zone I only Zone I and II Zone I, II and III Zone I, II, III and IV

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

15 19 20 25

In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as

Sum of thickness of both leaves Two-third of the sum of thickness of both the leaves Actual thickness of the stronger leaf Larger of (B) and (C)

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

Shear Vertical tensile splitting Buckling Any of the above

The consistency of mortar should be .............. for masonry work with solid bricks.

5 to 8 cm 9 to 13 cm 19 to 23 cm 14 to 18 cm

A composite cement-lime mortar is preferred over cement mortar for identical strength.

True False

Water retention for brick masonry should not be less than what percentage?

60 % 70 % 50 % None of the above

The vertical distance between openings one above the other in a load-bearing wall shall not be less than ......... For earthquake resistant masonry buildings.

60 cm 50 cm 75 cm None of the above

If the horizontal cross-sectional area of a wall is 1200 cm², then the basic stress shall be multiplied by a reduction factor equal to .........

0.75 0.95 0.85 None of the above

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. What is the slenderness ratio of the wall?

10 15 20 25

A high lime content in a composite cement-lime mortar results in ............

Slow hardening Weaker mortar Both A & B None of the above

A free-standing brick wall 20 cm thick is subjected to a wind pressure of 75kg/m². What is the maximum height of the wall from stability consideration?

1.28 m 1.5 m 0.64 m 0.96 m

What are the effective height of freestanding non-load-bearing wall and column respectively will be?

1.0H and 1.0H 2.0H and 2.0H 1.5H and 1.5H None of the above

What is the horizontal shear stress permissible on the area of a mortar bed joint for masonry built-in 1: 1: 6 cement-lime-sand mix mortar or equivalent?

0.1 MPa

0.15 MPa

0.075 MPa

0.125 MPa

Quiz/Test Summary

Title: Design of Masonry Structure

Questions: 20

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