Purlins for my steel roof (STAAD.Pro)

[zegino]

I have created a steel poultry shed, using C-channels back to back as my Beams and columns. I used Eurocode to check my analysis. All my sections are working well except a few of my purlins on the front and back eave. Anyone got any advice to how to make my purlins more stable please? I have attached my model below.

Thank you

 

[SethGuthrie]

Follow the parallel thread on Bentley communities regarding this:

https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/143905/purlins-on-my-roof