20

End condition code

Vfl T

Rotation fixed Translation fixed Rotation free Translation fixed Rotation fixed Translation free Rotation free Translation free

FIGURE 6.28 Effective length factor K for concentrically loaded compression members. Copyright 2005 by CRC Press

FIGURE 6.28 Effective length factor K for concentrically loaded compression members. Copyright 2005 by CRC Press where b = 1 — (xo/r0)2, sex = n2E/(KxLx/rx)2, st = Equation 6.73, and x0 is the distance from shear center to centroid along the principal x-axis.

For doubly symmetric and point-symmetric shapes (Figure 6.29), the overall column buckling can be either flexural type or torsional type. However, for singly symmetric shapes (Figure 6.30), the overall column buckling can be either flexural buckling or torsional-flexural buckling. For overall column buckling, the nominal axial strength is determined by Equation 6.75:

where Ae is the effective area determined for the stress Fn and Fn is the nominal buckling stress determined as follows:

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