10A. DIMENSIONING PART 1/4

Bending of the pole about its local strong y-y axis (green) means: • the buckling caused by the moment My (rotation about the y-y axis), i.e. out-of-plane buckling, which in the particular case, the unified, i.e. the total length of the post shall be taken as the buckling length. In the other direction, bending the pole about its local weak z-z axis (blue) means: • the bending caused by the torque Mz (rotation about the z-z axis), i.e. bending in-plane, the post is considered to be supported laterally by the thwarts and thus the bending length Lz will be taken as the length of each member. • NOTE As a general rule, we could say that, we obtain unified Ly length in direction where the local y-y axis is parallel to the elements supporting - securing the member, while in the other direction, if there are no elements, the individual lengths are taken as Lz . In the same example and with regard to the thymus: The supports from the poles are parallel to the local z-z axis (blue, out of plane) of the thimbles. So, the consolidation will be done in Lz (full length), while for the y-y direction (green, in-plane) the length of each member will be taken as Ly.