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Hello,
I modeled a structure using triangular fiber discretization with STKO. Later I modified the section.tcl file inserting a quad fiber discretization. Unfortunately, the results of the two analyzes do not converge. Can you tell me how do I spot the error? Or if is it correct this difference? I tried to visualize the structure manually modeled with quad fibers in the STKO post-processor but I did not succeed. Place here a photo in which I compared the movement of a knot in the two different models: for example, how can I tell if the sections are rotated in the same way? Because I thought it could be a possible problem that causes me the difference. But graphically I can't see them.

NOTE: I have used this procedure viewtopic.php?f=27&t=73
But I can't see the sections. I only see the geometry without sections.

problem solved. the sections were rotated differently in the two models. following the instructions in the link posted in the previous message I solved it. in fact, by showing the fiber plot you can see the orientation of the section. now the difference is very little

You already solved the problem. In fact whenever you see such a huge differnce between STKO-generated triangular fiber mesh, and a hand-written quad-fiber section, the only reason could be a different orientation.

Indeed there will always be a small difference, as the fiber-discretization is a numerical integration, thus only approximate. however the small difference will theoretically vanish in the limit of a finer mesh.