B 78
[Subsidiary]
Reinforced
concrete walls. L.N. 294/76.
CAP. 1231
Building (Construction) Regulations
[1985 Ed.
(3) For the purposes of paragraph (2) the cross-sectional area of a rectangular beam shall be taken as the total depth multiplied by the width and for a T or L beam shall be taken as the total depth multiplied by the width of the rib.
129. (1) Where reinforced concrete walls are intended to carry vertical loads, they shall, subject to the provisions of this regulation, be in accordance with the appropriate provisions of regulations 114 to 123 for reinforced concrete columns-
(a) in the application of regulations 114 to 123 to reinforced concrete walls, "effective height", "thickness" and "vertical" shall respectively be substituted for "effective column length", "least lateral dimension" and "longitudinal" wherever they occur in those regulations; and
(b) the provisions of regulation 122 relating to helical reinforcement shall not apply.
(2) In a reinforced concrete wall intended to carry vertical loads-
(a) the aggregate cross-sectional area of the vertical reinforcement shall be not less than 0.4 per cent of the gross cross-sectional area of the wall;
(b) the aggregate cross-sectional area of the lateral reinforcement shall be not less than 0.2 per cent of the gross cross-sectional area of the wall;
(c) the diameter of a vertical reinforcement shall be not less than 10 mm; and
(d) the distance between 2 vertical reinforcements shall not exceed 300 mm.
(3) Where in a reinforced concrete wall, the stresses do not exceed 75 per cent of the maximum permissible stresses specified in regulation 116-
(a) the provisions of regulation 122 relating to transverse reinforcement shall not apply;
(b) the aggregate cross-sectional areas of the vertical and lateral reinforcements shall each be not less than 0.2 per cent of the gross cross-sectional area of the wall.
(4) The thickness of any load-bearing reinforced concrete wall shall be not less than 125 mm.
(5) When tension occurs in a reinforced concrete wall, adequate reinforcement shall be provided to resist such tension and throughout the wall the reinforcement shall not in any section thereof be less than 0.4 per cent of the gross cross-sectional area of that section.