Steel stair Design
Steel stair Design
(OP)
Hey guys
Need some help on designing a steel stair for a bldg in the project that I am working on. I am not civil engineer so kinda lost where to start.
Any input will be highly aprreciated.
Thanks
Need some help on designing a steel stair for a bldg in the project that I am working on. I am not civil engineer so kinda lost where to start.
Any input will be highly aprreciated.
Thanks






RE: Steel stair Design
A clear conscience is usually the sign of a bad memory
RE: Steel stair Design
the dimensions and spacing are already set by the architect. now I got to size them.
Shall I go to the Codes (if yes which one)?
I think I can design the landing based upon the moment only right?
Then what bout the stringer beam?
Thanks
RE: Steel stair Design
RE: Steel stair Design
http://www.FerrellEngineering.com
RE: Steel stair Design
Start with some basic sections before getting buried in calculations.
Brad
RE: Steel stair Design
The stair section should be analyzed with all loads applied simultaneously. That means the treads are fully loaded (typcially at 100 psf)AND the railing is subjected to appropriate lateral loading (50 plf or 200 lbf applied at any point). Loads are transferred from the stair section to the landings which must also be designed (usually the landing attachment to the surrounding walls is the limiting factor...spans are small).
The simultaneous lateral loading on the railing can be a problem without some lateral bracing of the stringers. Further, the end section of railing is unsupported and cantilevers off the stringer...the top section usually ties back to the other stair section as it turns at the landing, thus providing lateral bracing.
As for member sizes, the most common stringer sizes are MC10 x 8.4 and MC12 x 10.6. Railings are usually 1-1/4" diameter pipe and railing posts are usually 2"x2" tube with a wall thickness of at least 1/8".
Now...back to what others have said...get a structural engineer with experience in this area involved. Stairs are life-safety issues...don't take on that liability without knowing what you're doing.
RE: Steel stair Design
If it falls on your lap, I agree with the others, get a structural engineer. Having been the specialty engineer for a steel fab, stairs can be pretty tricky, especially the geometry and fit-up... And sometimes the stinkin' hand rails are the hardest part to make work!
RE: Steel stair Design
This site is really awesome.
On the first post of this string, I meant I am not a structural engineer , but I am a civil engineer.
I try to get somewhere with these info.
RE: Steel stair Design
Bob G.
RE: Steel stair Design
http://www.FerrellEngineering.com