×
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

Allowable Load/Moment of Structural Steel Tubing?

Allowable Load/Moment of Structural Steel Tubing?

Allowable Load/Moment of Structural Steel Tubing?

(OP)
Are there any standard tables or literature listing the allowable load and/or moment of structural steel tubing used as a beam.  Specifically, I'm looking for a 6"x2"x1/4" used as a joist over a 7.75ft span.  The AISC ASD Manual doesn't list this info for structural tubing.  Just wondering if it is published or do I have to calculate differently?

RE: Allowable Load/Moment of Structural Steel Tubing?

For ASD design you would just compare the load with the allowable: Section F3-1 (pg 5-48 in the green book) the allowable stress for a tube is either 0.66 Fy or 0.6 Fy.
No lateral torsional buckling so just a straight stress is all that is needed.

RE: Allowable Load/Moment of Structural Steel Tubing?

I suggest
that when loading structural tubing in bending as well as calculating stress=My/I ,you consider buckling stress on the compression side ( allowable compressive stress is given in Chimney codes etc), my experience shows this to be the more critical stress especially on thin tubes. Also local crippling of the tube due to point load.

RE: Allowable Load/Moment of Structural Steel Tubing?

For future reference the Steel Tube Institute does publish beam and column capacity tables for HSS sections.

(http://www.steeltubeinstitute.org)

AISC has also published a specification geared specifically to tube shapes (It is available in the Hollow Structural Sections Connections Manual) but it is in LRFD

Appendix B5 of the AISC ASD manual (the green book) addresses the buckling of tubes with thin walls mentioned by dooron (determined in accordance with Chapter B5)

RE: Allowable Load/Moment of Structural Steel Tubing?

One other source worthy of mention is Troitsky's Tubular Steel Structures.  It is only $15.00 and available from Lincoln Arc Welding Company (James F. Lincoln Foundation).  It is an excellent reference for designing with Steel Tubing.

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