Flanged beams

For beams with flanges on the compression side of the section, the formulae for rectangular sections may be applied provided x/d < hf/d where h = thickness of the flange

For beams where the neutral axis lies below the flange, it will normally be sufficiently accurate to assume that the centre of compression is located at mid-depth of the flange. Thus, for singly reinforced beams, approximately

The neutral axis depth is given approximately by xld = 1.918 (blb)o> - 1.25 (b/b - 1 )hjd where b is the rib width and the definition of w is identical to that for a r rectangular section.

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