Aluminium Design and Construction John Dwight

Table 9.5 Necessary checks for members under combined axial load (P) and moment (M)
M – =equivalent uniform value of M, found as in Section 8.7.3;
P c =calculated resistance to axial load (on its own);
M c =calculated resistance to moment (on its own).
Check A: Localized failure of the cross-section
(9.18)
where: P c =value found as in Section 9.3 based on p a
M c =value found as in Section 8.2, reduced to allow for shear.
Check B: General yielding along the length
where: P c =value found as in Section 9.4 based on p o
M c =as for check A, but with no reduction for shear.
Check C: Overall buckling in the plane of the moment
(9.19)
(9.20)
where: P c =resistance to overall column buckling in the plane of the
moment or to torsional buckling,
M c =as for check A, but with no reduction for shear.
Check D: Overall buckling out of the plane of the moment
where: P c =resistance to column buckling about other axis,
S=plastic modulus of gross section about axis of M,
p b =limiting stress for LT buckling (Section 8.7.4).
Copyright 1999 by Taylor & Francis Group. All Rights Reserved.
(9.21)