DISCUSSION THREAD
Hints:
This is an indeterminate beam. You first need to decide the number of redundant loads, and then choose the redundant loads that you intend to use. In the end, your expression for the total strain energy in the beam must be written in terms of only the known and the redundant loads that you chose.
Consider the two sections, (BC and CH), of the beam. Determine first the bending moment carried by each sections, and from that write down the strain energy for each section, and sum these together. You then apply Castigliano’s theorem to determine the redundant loads.
Please note that a detailed outline of the solution for this problem is found on the lecture video for July 10. You may want to review that before you start your solution.
Any questions? Ask (and answer) questions here.