The city wants the roof to be metal and doesn't let wood structure because of fire hazards that exist in the area.
The pictures are the preliminary conceptual architectural drawings and we can change them.
I'm more inclined to go with the system in the image below now that I did a little bit...
I have a project in a high seismic region which is a horse stable (40'*x117') with so many openings on the sides that doesn't let me use vertical bracings and design it like a normal warehouse.
The roof should be metal and I want to use z purlins that sit on w-shapes. I don't know if I have to...
