The column below has the length LB, added to the data table below. It is made from the materialadded to the table below and the beam is made in form

of the mentioned in the table I-sections.Determine the critical load for its stability if: a) It is pin-supported= b) The bottom is fixed and the top is pinned; 5 c) The system is fixed on the bottom; 5 Points d) Both ends are fixed; 5 Points e) For each system determine the developed stress. 20 Points