Stair Stringer Unbraced Length

[ARLORD]

When designing stair stringers for typical 46" wide steel stairs , do you consider the length of the stringer fully braced by the treads and risers. In most cases the treads and risers are welded to the stringer with L1.5x1.5.

 

[WillisV]

Previously discussed: thread507-192367

 

[ARLORD]

http://www.eng-tips.com/viewthread.cfm?qid=192367

 

[Ron]

I have analyzed a lot of stairs for forensics investigations and have designed stair stringers. I consider the stringers to be fully braced by the treads.

The referenced threads come to essentially the same conclusion.

 

[msquared48]

The stair system starts emulating a Verendiel Truss system. Hence the lateral bracing... Sorry for the spelling - it's too hot to get up and look it up.

Mike McCann
MMC Engineering