I am making a comparison between different beams and looking at the lateral buckling. I have a beam on 2 supports, 3 supports, 4 supports and 5 supports. the length of the fields between the beams is always 8.95 meters and the loads are always 77 kN/m. When optimizing the cross-section, it always displays a larger profile because the Mcr is getting smaller:
2 supports: HEB500
3 support : HEB800
4 support :HEB900
5 support :HEB1000
I think this is not correct because a beam at several supports gets a small buckling length, which makes the Mcr bigger. How is this possible?
ligger-2 steunpunten verdiepingsligger lijnlast optimalisatie goed.gh (71.0 KB)
ligger-4 steunpunten verdiepingsligger lijnlast.gh (81.7 KB)
ligger-5 steunpunten verdiepingsligger lijnlast.gh (83.8 KB)
ligger-3 steunpunten verdiepingsligger lijnlast.gh (77.3 KB)