I have a couple of questions concerning the rotation of singe angle members. Which command should I use to rotate these angle members? "Beta Angle" or "Beta 45" (or 135 or 225 or whatever your required angle is)? I pose this question because I would have thought the results would have been the same but they are not. The results for "Beta Angle" actually match those of an angle member modeled along its principal axis with no rotation or "Beta 0". I also would have thought the properties for the weld design, namely Sz, Sy, CH & CV, would have changed with this "Beta Angle" command since the member end forces are no longer being applied in the same manner to the weld. Any thoughts?
When you apply a BETA angle with the purpose of making the legs parallel to the global axes, the principal axis now become inclined to the global axes.
In such situations, if you want the load to be parallel to the legs, those loads must be applied along the global axes. If they are displayed in the GUI as acting along the principal axes directions, it is because you have chosen a local axis direction.
If this doesn't answer your question, please attach your model.
I want to apply wind load as per purlin spacing , as per your answer i have to apply this load in two components parallel to Global x & y, but it is to lengthy. you have any trick?
thanks for rply