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D5.D.8.4 Clause – LTB for rolled sections or equivalent welded section

The Polish-NA provides the values for the terms λLT,0 and β factors given in clause as follows:

For all sections, use:

  • λLT,0 =0.4 and β = 0.75

The Polish NA specifies the use of uses table 6.5 to work out the buckling curves for use in Cl. Hence table 6.5 in PN-EN 1993-1-1 will be used for this.

These equations and factors are then applied to equation 6.57 of PN-EN 1993-1-1 to evaluate the Lateral Torsional Buckling reduction factor χLT.