## Figure

Procedure for determining flexural capacity of flanged ribs Determine Iq (see Figure 7) and beff from: beff = (bw+beffi + beff2) where beffi = (0.2bi + 0.1 lo) < 0.2 lo < bi beff2 = (0.2b2 + 0.1 lo) < 0.2 Iq < b2

Note: The flange width at the support will be different from that at mid-span. For symbols refer to Figures 7 and 8

Determine K from: K =

bd2 fck

Determine K' from Table 2 or K = 0.60 d-0.18d2 -0.21 where d < 1.0

Neutral axis in web Calculate moment capacity of flange from: Calculate area of reinforcement required from

 No Outside scope — of this publication
 Calculate lever arm z f z = f" [ 1+V1 - 353K rom s 0.95d Calculate depth to neutral axis x from: x = 2.5 (d - z) 1 1.25hf -

Neutral axis in web Calculate moment capacity of flange from:

Neutral axis in flange. Design as rectangular section.

 No Redesign Definition of lo, for calculation of effective flange width Figure 7 Definition of lo, for calculation of effective flange width Figure 8 Effective flange width parameters Figure 8 Effective flange width parameters  ## Greener Homes for You

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