HW$06\mathrm{.}1$ For structure just below, find the horizontal translational displacement at D by means of the virtual work method. Use $E=3,600$ksi,$I=1100i{n}^4.$ Consider that only flexural internal strain energy is significant.

Note that table inside the front cover of the textbook is helpful for doing the integrations required for the virtual work method. That table, with an additional column, appears on the next page.