This is a form traveller for bridge construction.
We used the same geometry, the same materials, the same cross sections, and the same boundary conditions to model it in different softwares, like Sap2000, Midas Gen, Scia Engineers, Sofistik, and Robot of course.
We can run the analysis in Sap2000, Midas Gen, Scia Engineers and Sofistik successfully and all 4 softwares gave use very similar results.
But when we run the analysis in the Robot, it always shows "Instability detected in the XXX direction of YYY node"
We checked the model, but couldn't find issues. The Robot model is attached.
