1985 Ed.]
Building (Construction) Regulations
[CAP. 123
(d) No reinforcement parallel to the adjacent edges of the slab need be inserted in the edge strips above that required to comply with sub-paragraph (e) and regulations 124 and 127(b).
(e)
(i) Torsion reinforcement shall be provided at the corners of a slab except at corners contained by edges over both of which the slab is continuous.
(ii) At corners contained by edges over neither of which the slab is continuous, top and bottom reinforcement shall be provided for torsion at the corners of the slabs. Both top and bottom reinforcement shall consist of 2 layers of bars placed parallel to the sides of the slab and extending in these directions for a distance of 1/4 of the shorter span. The area of the bars in each of the 4 layers, per unit width of the slab, shall be 3/4 of the area required for the maximum positive moment in the slab.
(iii) At corners contained by edges over only 1 of which the slab is continuous, the torsional reinforcement may be reduced to 1/2 of that required by sub-sub-paragraph (ii).
(iv) Any reinforcement provided for the purpose of complying with other regulations may be included as part of the reinforcement required to comply with this paragraph.
(f) Where a slab ends and there is monolithic connection between the slab and the supporting beam or wall, provision shall be made for the negative moments that may occur in the slab at such support. The negative moment to be assumed in these cases depends on the degree of fixity afforded to the edge of the slab, but for general purposes it may be taken as 1/3 of the moment given in Table XXXV for the mid-span of the slab.
(5) The loads on the supporting beams for a 2-way rectangular slab shall be assumed to be in accordance with Diagram 2.
DIAGRAM 2
Diagram showing the load carried by supporting beams
∙ly
B 87
[Subsidiary]
LOAD INCLUDED IN THIS SHADED AREA TO BE CARRIED BY BEAM A
LOAD INCLUDED IN THIS SHADED AREA
TO BE CARRIED BY BEAM B