In RSTAB/RFEM, I have defined a tapered member consisting of two different cross-sections. In the rendering mode, it is displayed incorrectly. What did I do wrong?
A "continuous" taper is drawn if both member ends have the same cross-section type (cross-section row).
Therefore, you can replace the cross-section with the smaller depth by a cross-section from the same cross-section row as the cross-section with the greater depth (and, if necessary, adjust the depth for special cross-sections).
The easiest way to do is when you model both cross-sections as welded sections.
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions