Design of Masonry Structures

1. 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

1. 0.090
2. 0.095
3. 0.100
4. 0.105

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2. 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

1. 15
2. 19
3. 20
4. 25

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

1. 0.64 m
2. 0.96 m
3. 1.28 m
4. 1.5 m

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4. 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:

1. Both A and R is true and R is the correct explanation of A
2. Both A and R is true and R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

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5. Assertion A : For identical strength, a composite cement-lime mortar is preferred over cement mortar.
Reason R : Composite cement-lime mortar has higher drying shrinkage than cement mortar.
Select your answer based on the codes given below:

1. Both A and R is true and R is the correct explanation of A
2. Both A and R is true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

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6. Assertion A : From consideration of structural soundness and economy of design, most codes
control the maximum slenderness ratio of masonry walls and columns.
Reason R : By controlling the maximum slenderness ratio, failure is by excessive stress and not by
buckling. Select your answer according to codes given below:

1. Both A and R is true and R is the correct explanation of A
2. Both A and R is true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

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7. Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar. Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars. Select your answer according to the codes given below:

1. Both A and R is true and R is the correct explanation of A
2. Both A and R is true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

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8. Assertion A : Limiting value of slenderness ratio for a column is less than that of a wall.
Reason R : A column can buckle around either of the two horizontal axes while a wall can buckle around only one axis.
Select your answer according to the codes given below:

1. Both A and R is true and R is the correct explanation of A
2. Both A and R is true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

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9. 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
Of these statements

1. Only (ii) is correct
2. (i) and (ii) are correct
3. (ii) and (iii) are correct
4. (i), (ii) and (iii) are correct

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10. Consider the following statements regarding bands to be provided for strengthening masonry work in masonry buildings constructed in zone III, IV and V.
(i) Lintel band is provided at lintel level on partition walls,
(ii) Gable band is provided at top of gable masonry below the purlins,
(iii) The bands shall be to full width of the wall and not less than 7.5 cm in depth,
(iv) The bands shall be made of reinforced concrete only.
Of these statements, the correct statements are

1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iv)
4. (ii) and (iii)

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