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c) notional flat width bp for a web (bp s slant height sw)

b) notional flat width bp of plane elements b, c and d d) notional flat width bp of plane elements adjacent to stiffeners

Figure 3.3: Notional widths of plane elements bp allowing for corner radii

(3) The influence of rounded corners with internal radius r < 5t and r < 0,15/bp on section properties may be neglected, and the cross-section may be assumed to consist of plane elements with sharp corners.

(4) If the internal radius r exceeds the limits given in (3) the influence of rounded corners on section

where:

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