SABS 0100-1Ed. 2.246

Figure 9 — Division of slab into middle and edge strips

a) tension reinforcement at mid-span: extend at least 50 % of the tension reinforcement providedat mid-span in the middle strip in the lower part of the slab to within 0,15l of the continuous edgeaxis, and to within 50 mm of the discontinuous edge axis; extend the remaining part of thereinforcement to within 0,25l of a continuous edge axis, and to within 0,15l of the discontinuousedge axis;b) tension reinforcement over the continuous edges: extend at least 50 % of the tensionreinforcement provided in the upper part of a middle strip to a distance 0,3l from the face of thesupport; extend the remaining part of the reinforcement to a distance of 0,15l from the face of thesupport;c) tension reinforcement over the discontinuous edge: at a discontinuous edge, negativemoments may arise, depending on the degree of fixity of the edge of the slab; in general, tensionreinforcement equal to 50 % of that provided at mid-span extending 0,1l into the span (from theface of the support) will be sufficient;d) tension reinforcement in an edge strip, parallel to the edge: the reinforcement need not exceedthe minimum given in 4.11.4 and the minimum given in the rules for torsional reinforcement givenin (e), (f) and (g) below;e) torsional reinforcement at any corner where the slab is simply supported on both edgesmeeting at that corner: the reinforcement should comprise top and bottom reinforcement, eachwith layers of bars placed parallel to the sides of the slab and extending from the external faces ofthe edges a minimum distance of one-fifth of the shorter span; the area of reinforcement in eachof these four layers should be three-quarters of the area required for the maximum mid-spanmoment in the slab;f) torsional reinforcement at any corner contained by edges over only one of which the slabis continuous: reinforcement equal to half of that described in (e) above should be provided;g) torsional reinforcement need not be provided at any corner contained by edges over bothof which the slab is continuous: where ly /lx exceeds 3, so design slabs as to span one way only.