Determining the value of Mcr we can take into account the distribution of bending moments (see for example access steel SN003a document - factors C1, C2...)
Should we then modify the XLT factor?
XLT,mod = XLT / f
Factor f is intended to take into account the moment distribution between the lateral restraints.
But we have already taken into account the moment distribution - during Mcr calculation.
In this way, we consider twice the same effect.
Any ideas?
Yes you should.
In the calculation of Mcr, you only consider elastic stability aspects.
In the second step you consider in addition positive contributions such as the spread of yielding along the beam. For further details check my book
Design of Steel Structures
Thank you for your quick and comprehensive answer :)
Regards from Szczecin
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