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
0.090
0.095
0.100
0.105
Correct Answer :
C. 0.100
Related Questions
For earthquake resistant masonry buildings, the vertical distance between openings one above the other in a load bearing wall shall not be less than
50 cm
60 cm
75 cm
100 cm
Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than
10 cm
15 cm
20 cm
30 cm
Consider the following statements: A high lime content in a composite cement-lime mortar results in
1. Slow hardening.
2. Quick setting.
3. Weaker mortar.
Of these statements
2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
1, 2 and 3 are correct
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
Both A and R is true and R is not the correct explanation of A
A is true but R is false
A is false but R is true
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
Only (ii) is correct
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (ii) and (iii) are correct
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
Of these statements
(i) and (iii) are correct
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (ii) and (iii) are correct
The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is
Less than or equal to 1/24
Less than or equal to 1/6
More than 1/24
Less than or equal to 1/12
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
Where a structural component or a system is providing lateral support to five or more walls or columns, the lateral load to be resisted may be taken as _________ of the total vertical load on the most heavily loaded wall or column in the group
4 %
5 %
6 %
7 %
Consider the following statements: The use of relatively weak mortar
1. Will accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.
2. Will result in reduction of stresses due to differential expansion of masonry units.
Of these statements
1 alone is correct
2 alone is correct
Both 1 and 2 are correct
Neither 1 nor 2 is correct
For masonry built in 1 : 1 : 6 cement-lime-sand mix mortar or equivalent, the horizontal shear stress permissible on the area of a mortar bed joint is
0.15 MPa
0.125 MPa
0.1 MPa
0.075 MPa
Consider the following statements regarding provision of chases in masonry,
(i) No chase should be permitted in a half brick load-bearing wall,
(ii) Vertical chases should not be closer than 2 m in any stretch of a wall,
(iii) Chases should be provided near to bearings of beams and lintels.
Of these statements
(i) and (ii) are correct
(i) and (iii) are correct
(ii) and (iii) are correct
(i), (ii) and (iii) are correct
The basic stress in masonry units having height to width ratio of 1.5 may be increased by a factor of
1.2
1.4
1.6
2.0
Rich cement mortars are more liable to cracking as compared to lean mortars because rich mortars have
High shrinkage
Less strength
Both (A) and (B)
None of above
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
0.64 m
0.96 m
1.28 m
1.5 m
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
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 6
0.75
0.85
0.95
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
Of these statements
(i) and (ii) are correct
(ii) and (iii) are correct
(i) and (iii) are correct
(i) and (ii) and (iii) are correct
Consider the following statements:
1. Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.
2. Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.
3. Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.
Which of these statements are correct?
1, 2 and 3
1 and 2
2 and 3
1 and 3
The thickness of each leaf of a cavity wall shall not be less than
5 cm
7.5 cm
10 cm
15 cm
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:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Direct load carrying capacity of a brick masonry wall standing freely as against when it supports RC slab will be
More
Less
The same in both the cases
100 %
Minimum compressive strength in N/mm² for H1 type mortar used for masonry is
3
5
7.5
10
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?
Providing buttresses at certain intervals
Providing a deeper foundation
Using a richer mortar
Using stronger bricks
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:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
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:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
If H is the height of wall between centers of supports, then the effective height of wall where concrete floors have a bearing on wall irrespective of the direction of span will be
0.75 H
0.85 H
1.0 H
1.5 H
In the case of panel wall subjected to horizontal loads at right angles to the plane of the wall, with the mortar not leaner than Ml type, tensile stress in bending in the vertical direction may be allowed to the extent of
0.4 kg/cm²
0.7 kg/cm²
1.0 kg/cm²
1.2 kg/cm²
The timber floor not spanning on the masonry wall but properly anchored to the wall gives
Lateral restraint but not rotational restraint
Rotational restraint but not lateral restraint
Both lateral and rotational restraints
Neither lateral nor rotational restraint
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