z,Sd

Xz Xmin is the effective airea of an effective cross-section that is subject only to axial compression, see figure 6.6(a);

the effective section modulus for the maximum compressive stress in an effective cross-section that is subject only to moment about the y - y axis, see figure 6.6(b);

is the effective section modulus for the maximum compressive stress in an effective cross-section that is subject only to moment about the z - z axis, see figure 6.6(c);

is the additional moment due to possible shift of the centroidal axis in the y direction, see 5.6(2)P;

is the additional moment due to possible shift of the centroidal axis in the z direction, see 5.6(2)P;

is the reduction factor from 6.2 for buckling about the y - y axis; is the reduction factor from 6.2 for buckling about the z - z axis; is the lesser of xy and xz •

a) Axial compression

Yeff i/

Zeff

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