0656

and the length of the half-buckle wavelength is given by

ff Glt 12

A reasonable approximation based on test data obtained by Bank et al. (1994b, 1995) for common pultruded WF beams is to assume that the critical local buckling stress for the compression flange is equal to the average of the simply supported and the fixed conditions given in Equations 16.17 and 16.19.

For compression flanges where both longitudinal edges are restrained, such as in box beams or hat sections, the flange is assumed to be simply supported on both of its longitudinal edges and the critical buckling stress is given as

2p2 ff2

"bT

VeleT

Glt v12(1 - VlVT) 12(1 - VLVT) and the length of the half-buckle wavelength is given by

The equation for the case of flange fixed (built-in) at both longitudinal edges is given as

VEdffi

4.52p2ff2

and the length of the half-buckle wavelength is given by vTeT gTT

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