Q5. Now you wish to identify a steel option for the portal frame. As such, considering the same load, W, what is the lightest universal beam (UB) steel section size that you would require in order to limit the lateral drift of the building to H/500? Note that you can again assume that the same steel UB section will be used for both the columns and beams (i.e. I_b = I_c). Also note that steel will not be affected by the load duration and that section tables provided at the back of the course reader provide section properties for different-sized steel sections. Report the section size, e.g. 360UB44.7.