Hi all,
The compound box section are made of UC305x406x340, which is the main beam. There are continuous secondary beams on top of the compound box section, imposing load onto it. I spotted a torsional moment of 200kNm.
For the same set of model, when i change it to UB sections (any size), the torsion will drop to a value of 15 kNm sth.
I also tried to define the compound section as parametric box sections, or modifying UC's torsional stiffness, still see a value of 200 kNm. Anybody knows why?
Thanks!