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Maximum compressive stresses in walls or piera of bricks or building blocks.
BUILDING (CONSTRUCTION) REGULATIONS, 1956
58. (1) Where, in the case of walls or piers built of bricks or building blocks, the slenderness ratio of any storey height does not exceed 1, the compressive stresses in such storey height shall not exceed those specified in Table VIII for the designated bricks or building blocks opposite the specified mixture of mortar.
(2) Where the slenderness ratio of such storey height does exceed 1, the compressive stresses in that storey height shall not exceed the appropriate stress specified in Table XII multiplied by the factor specified in Table XIII for the slenderness ratio of such storey height:
Provided that the slenderness ratio shall not exceed 18.
(3) The compressive stress shall be deemed to be the sum of the dead and imposed load distributed uniformly over the area sustaining such load.
TABLE XII,
Maximum compressive stresa in tons per square foot on walls and piers of bricke or building blocks when the slenderness ratio does not exceed one.
Mix of mortar.
Designation of bricks or building blocks, and minimum crushing strength (9)
'
Squared
Granite
7,500
Iba./ 94.
$
Blocks
10
S 760
Solid Concrete
Common
Bricks
Hallow Blocks
1bs./9q+
2,600
ini.
S 1,600
lbs./ sq. in.
1ba/ Bq. in.
1
0-
3
32
13
0-1
4
24
12
1
H
12
11
1
2
20
6
1
12
13
#
30
-
* in accordance with Regulation 15 up to 1 part of lime may be added to cement-mortar. The strength of the brick or building blocks shall be determined in accordance with the provisions of Schedule IV of the London Building (Constructional) By-laws, 1952-"Method of test for resistance to crushing of bricks and blocks".
BUILDING (CONSTRUCTION) REGULATIONS, 1966
TABLE INI.
Raduction factor for slanderuese ratio.
Bricks and building blocks. (sub-regulation (#)
Slenderness Ratio.
Factor
Factor
Slenderness Ratio.
1
1.00
10
0.60
0.96
12
0.50
0.88
14
0.40
6
0.80
16
0.36
୫
0.70
18
0.90
The factor for intermediate values of the alenderness ratio shall be determined by interpolation.
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50. (1) Where, in the case of walls or piers built of concrete, Maximum
compressive the slenderness ratio of any storey height does not exceed 1, stresses in the compressive stresses in such storey height shall not exceed walls and
piers of those specified in Table XIV for the designated grade of concrete. concrete.
(2) Where the slenderness ratio of such storey height does exceed 1, the compressive stresses in that storey height shall not exceed the appropriate stress specified in Table XIV multiplied by the factor specified in Table XV for the slenderness ratio of such storey height:
Provided that the slenderness ratio shall not excced-
(a) in the case of a pier, 18;
(b) in the case of a wall, with the minimum reinforcement specified in sub-regulation (4) of this regulation, 24.
(3) The compressive stress shall be deemed to be the sum of the dead and imposed load distributed uniformly over the area sustaining such load.
(4) (a) Shrinkage reinforcement shall be provided in all
concrete walls.
(b) The volume of that reinforcement shall be not less than 0.4 per cent of the volume of the concrete in the wall, and half of that reinforcement shall be disposed vertically and half horizontally.
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