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

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