Horizontal Bracing

[Orsted]

Hi guys,

I'm designing a self supporting stair (not connecting to any structural beams/columns) and from the structural drawings there are horizontal braces along the stringers (see 2nd photo)

No lateral loads will be transmitted to the stair only gravity loads. I'm wondering if this horizontal brace is even needed and if it is needed what loads will be carried by this brace? Is there any code that will provide minimum design load for this?

Thank you for your time and response.

 

[Agent666]

What type of treads do you have & how are they connected, that makes a big difference?

In practice most treads stiffen the span, and depending on the landing material and how its fixed the landings are the things that need bracing. If you don't adequately brace stairs (either through the treads or other means) they can feel bouncy, but in reality they are swaying/moving/vibrating sideways.

 

[Orsted]

Agent,

I have a tread pan (gage is not yet decided) and it's directly welded to the stringers.

 

[Agent666]

That will be quite stiff in its own right without any bracing I would imagine. I'd say bracing of the flights wouldn't be required usually in that case.

 

[Orsted]

Yes, that's also what I'm thinking. I'll try to reason this out.

Thank you.