×
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

beam lateral bracing

beam lateral bracing

beam lateral bracing

(OP)
Are there any cases where a metal deck being welded to the top flange of a beam be considered NOT good enough to provide continuous lateral support for this top flange? (example if it was a very long span?)Are there any additional erection notes others are adding to the drawings to be sure the deck is properly attached for the braced assumption?
 Also, since stl jst manufacturers specify minimum bracing per joist type and span, does anyone know if that means they wouldn't consider the deck weld as bracing the top compression chord?
thanks

Will

RE: beam lateral bracing

One can guess there are cases where your guesses come true. A ponding last span pulling the top chord is no good thing to see from LTB viewpoint. So in some sense, it is seen is the extant lateral stiffness (in the failing case above negative stiffenss since pulling) what matters. Maybe the manufactures specifying bracing is a neat way of getting out of these problems, and that would mean that effectively, for some cases they think (and have seen) the deck not being bracing enough.

Anyway, attached decks with equal spans at both sides won't displace (nor much must do end spans) in service or even strength level behaviour if not failed (when the secondary catenary load path develops). And continuous bracing is very effective to prevent buckling, since only small amounts of bracing is required.

Theodore V. Galambos Guide to Stability Design Criteria for metal structures 5th ed treats braced beams of your problem kind in section 13.5.3 at p.507. The question is that the answer there given makes the strength linked to one effective shear modulus of the deck, which is maybe tantamount to your won question.

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