Portalized bays for shed longitudinal displacements

[Italo01]

Hello, i`m designing a Shed using portal frames and i cannot use bracing on the longitudinal direction(The shed is used for cattle and the client doesn`t want the bracing interfering on the cattle movement). I tried to introduce moment resisting connections but since the Columns have very low inertia on the weak-axis, its not working well. Doing some research, i found a document called "Elastic design of single-span steel portal frame buiildings to eurocode 3" which have a good idea and that will work pretty well. It consists of frames built between some columns.
My question is about the detailling of the portalized bay. Has anyone done this that could give me some advice?
Thanks.

 

[GeorgeTheCivilEngineer]

What exactly is the issue?
Usually the longitudinal portalised columns come welded in one large column. The eaves beam is switched out for a suitable UB, on a large shed it could have haunches. I would discount the contribution from the lateral column.

Key thing is to get the other eaves beams and the UB to line through.

Agricultural allowable displacement is pretty generous which helps.

This isn't an uncommon solution, but I'd definitely flag the need for temporary bracing for the steel erector.

 

[Italo01]

Thanks George.

The columns are welded just for erectiont purposes?

I thought of using eaves struts centralized with the portalized beam. The eaves strut would have a end plate and would be bolted to the large columns web and portalized columns flange.

And you use the same base plate for both columns?

 

[HTURKAK]

The following doc. ( Single-Storey Steel Buildings
Part 4: Detailed Design of Portal
Frames )

 

[JLNJ]

Maybe you can put the portal beam down low (cows are not very tall, or so I think) which makes the portal frame much, much more efficient. You can even brace between the portal beam and the upper eave to create a direct load path.