B 42
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
[Subsidiary]
Definition of slenderness ratio,
Maximum
compressive stresses in walls or piers of bricks or building blocks.
(b) if not exceeding 1.8 m in height, be not less than 100 mm
thick and built solid or honeycombed; and
(c) be provided with buttresses or piers not less than 225 mm square in horizontal section and not more than 2 m apart centre to centre which shall be placed--
(i) at all angles of such wall; and
(ii) at each end thereof unless such wall is bonded into another wall not less in thickness than the buttresses or piers required;
(d) if exceeding 1.8 m in length but not exceeding 3 m in
height, be not less than 225 mm thick.
64. (a) The slenderness ratio of any wall or pier of any storey
height shall be
(i) in the case of a wall, the ratio of the effective height to the thickness of the wall, exclusive of plaster or rendering:
(ii) in the case of a pier, the ratio of the effective height to the least lateral dimension.
(b) The effective height of a storey height of a wall or pier shall
be as shown in column 2 below-
Support to Wall or Pier
(i) Wall with lateral support at the top of that storey height (ii) wall without lateral support at the top of that storey height
(iii) pier with lateral support at the top of that storey height (iv) pier without lateral support at the top of that storey height
Effective Height
3/4 of the storey height.
1 times the storey height.
the storey height.
2 times the storey height.
65. (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 XIII for the designated bricks or building blocks opposite the specified mixture of mortar.
(2) Where the slenderness ratio of such storey height exceeds 1, the compressive stresses in that storey height shall not exceed the appropriate stress specified in Table XIII multiplied by the factor specified in Table XIV 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 loads distributed uniformly over the area sustaining such load.