# Statement (I): Strength of brick wall is dependent on the type of bricks and the mortar used. Statement (II): Slenderness ratio of masonry decides the

50 views
in General
closed

Statement (I): Strength of brick wall is dependent on the type of bricks and the mortar used.

Statement (II): Slenderness ratio of masonry decides the strength of the wall, and also mortar type to be used.

1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

by (41.0k points)
selected

Correct Answer - Option 2 : Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Concept:

The basic compressive stress of masonry depends upon the crushing strength of masonry units (bricks) and type of mortar used.

Basic compressive stress also depends upon surface characteristics, water absorption property of units, uniformity of shape and size of units, thickness of joints etc.

For a wall, the slenderness ratio shall be the effective height divided by the effective thickness and stiffening coefficient (Kn) or the effective length divided by the effective thickness, whichever is less.

Thus, $SR = \frac{h}{{t{K_n}}}$

 No. of storeys Thickness of wall Maximum values of S.R Mortar containing cement Mortar not containing cement Not exceeding 2 Any 27 20 Exceeding 2 Walls of 90 mm thickness or more 27 13 Wall less than 90 mm thickness 20 13

So slenderness ratio of masonry decides the strength of the wall, and also mortar type to be used.