AS/NZS 4600 Cylindrical Tubular Members Query

[sdz]

AS/NZS 4600 3.6.2 has an equation
Mb=1.25 fy ...3.6.2(1)

This is clearly wrong. Can anyone tell me the correct equation? Similarly for equations (2) and (3).

 

[vistek]

You are referring to AS/NZS 4600 - 2005, yes the equation is incomplete. If you look back in AS/NZS 4600 - 1996: Section 3.6.2, equ. 3.6.2(1)... Mb=1.25*fy*Zf, where Zf is the full unreduced section modulus for the extreme compression fibre.
Equ (2) and (3) similar.