Check the column for buckling according to EC3. HEB300/S275 and axial force NEd=1500KN. The column (L=12m) is pinned at the two far ends (strong axis y-y). The column is pinned every 4m at the weak axis z-z.
We check that the section will not yield before buckling (not a class 4 Section).
Buckling curve b, imperfection factor for buckling curve b α=0.34