Is it possible to use a beam section with an offset to model a shell stiffener?
I don't seem to be getting a match for the rotational mode.
Yes, the test below shows the rotational mode of the combined section is
accurately captured compared to an all shell model. Note that the BEAM188 warping dof
has to be turned on for this torsional mode (keyopt(1)=1.) You must specify outres,all,1 to
see the 3D image of the deformed beam element.