×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Stair Stringer Design

Stair Stringer Design

Stair Stringer Design

(OP)
Could anyone recommend a good refernce for steel stringer design. It seems there is a de-facto std. using mc12X10.6 or c12X20.7. Has anyone run through these calcs to satisfy a curoisty on limtations of these channels?

RE: Stair Stringer Design

Hi,
I think one of the best resources are the documents sold by NAAMM (www.naamm.org). Great and easy to understand documents.

RE: Stair Stringer Design

Stair stringers are not that complex to design. Like you said, the C12 or MC12 are the universal de-facto sizes. They work well with the rise and tread dimensions. They provide flanges for handrail connections.

Loading wise, for a typical stair flight of 4 feet in width, and live load of 100 psf, you are only loading each stringer with 200 PLF. Adding the code required point load (I think is 300 pounds) and apply it conservatively to one stringer. Note that OSHA has more severe loading on stairs for industrial applications than office or residential stairs. Most building codes limit the stair flight to a maximum of 12 feet vertically. Simple analysis will indicate that the 12 inch channels are more than adequate to carry the loads.

Good luck

RE: Stair Stringer Design

Be careful if you have the 12" stringers spanning very far. I have had at least one project where the numbers worked o.k. for both deflection and strength, but stair was still bouncy, and we had to add a couple of posts.

RE: Stair Stringer Design

mrengineer,

Your point is well taken. Human comfort is critical. The way to watch for is to control the span.

Regards

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources