(Smaller) Portal Frame Structure

[rookie96]

I am requested to design a steel structure shed with specific dimensions on a pre poured reinforced concrete slab of 200mm thickness. The main force acting is wind load, I have tried to look for design examples of structures this size but couldn't find any, so I applied portal frame structure theory, and these are the sizes I ended up with in the image.

My question is for a pin-based structure of this size is this design feasible or is there a more convenient design method to build.

I'm also thinking to remove the haunches since the maximum moments are low (<30kNm).

 

[GeorgeTheCivilEngineer]

It'd work but not be very economical - a mono pitched or flat roof would simplify the fabrication a bit, as you say haunches are unlikely to be required.

Have you made full use of slack horizontal deflection limits and partial base fixity at SLS?

 

[Retrograde]

For a shed that size I would not bother with the haunches.

I would also make the roof rafter a single member instead of putting the splice in the middle. If you want the gable roof use variable height purlin cleats to achieve the falls.