38
Bccentric
loads and
lateral
forces on elender walls.
BUILDING (CONSTRUCTION) REGULATIONS, 1956
(c) The reinforcement shall be disposed near the wall sur-
face and the spacing of bars shall not exceed 12 inches.
TABLE XIV.
Maximum compressive stress in tons per square foot on walls and piera of concrete, when the slendernesa Patio does not exceed ako.
Maximum permissible stresa.
50
Designation of concrete, 38
specified in regulation 19.
tons per sq. ft. lbs. per sq. in.
Grade 1
780
Grade II
44
680
Grade III ..................... DOOR
Grade 1V
89
600
20
350
Grade
16
260
TABLE IV.
Factor for slenderness ratio. Concrete.
Factor
Blenderness Ratio.
Factor
Slenderness Ratio.
1
1.0
12
0.67
0.97
14
0.61
0.01
18
0.65
0.36
18
0.49
B
0.79
21
0.40
10
0.73
24
0.31
The factor for intermediate values of the slenderness ratio shall be determined by interpolation.
60. (1) The maximum stresses specified in regulations 58 and 59 may be exceeded by not more than 25 per cent where such excess is caused solely by eccentricity of loading or to lateral forces or to a combination of both.
BUILDING (CONSTRUCTION) REGULATIONS. 1956
(2) Additional stresses of a purely local nature, as at girder bearings, column bases and lintels or other concentrated loads, are to be calculated and the maximum stress resulting from these combined with those provided for in regulations 58, 59 and 60(1) shall not exceed the permissible stress given in regulations 58 and 59, as the case may be, by more than 50 per cent.
(3) In the case of walls of bricks or building blocks, no reliance shall be placed on the tensile strength of the bricks or building blocks.
61. (1) Where an external wall is constructed of materials Panel used in combination with a framework of steel or reinforced con- walla. crete, any part of that wall which does not sustain and transmit any load other than that due to its own weight and to wind pres- sure on its own surface may be deemed to be a separate panel
wall.
(2) In every panel wall constructed (otherwise than as a cavity wall) of bricks or building blocks--
(a) the thickness shall be not less than 82 inches throughout; (b) the height shall not exceed 24 feet;
(e) either the height or the length (whichever is the less)
shall not exceed 18 times the thickness; and
(d) the base shall not overhang the beam upon which it is supported, to a greater extent than of the thickness of the panel.
(3) In every panel wall constructed as a cavity wall- (a) the provisions of regulation 53 shall be complied with except that the inner leaf may be constructed of solid or hollow bricks or blocks not less than 4 inches thick;
(b) the height shall not exceed 24 feet;
(c) either the height or the length (whichever is the less)
shall not exceed 12 feet;
(d) the area shall not exceed 200 square feet; and
(e) the base shall not overhang the beam upon which it is supported, to a greater extent than of the thickness of the overhanging leaf:
39