Re: How can I make a bird's eye on a steel vaulted roof Hello; In your attached project, I made a very simple assumption and copied the steel columns and beams that you modeled on the slab onto the reinforced concrete beam and completed the data entry between the beams with inter-element coating. For the roof covering in the other direction, I consoled the purlins and brought them closer to the eyelet and tried to model as much as possible without overlap and gaps. I recommend you to do a little more fine work on this model. The situation you need to know is that the steel columns you enter on the reinforced concrete slab are not connected to the slab, they are not suitable according to the regulation. Since it is not connected, the lower end of those two columns looks built-in and the program can analyze. For this reason, the most important thing is the columns I sit on the reinforced concrete beam, this is the correct state. Since there will not be a main carrier system element on the floor in the bird's eye anyway, in this way the loads of the formwork, other columns and beams and the coating can be transmitted. Good work.