×
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

Torsion Rotation Formulas - Open Versus Closed Shapes

Torsion Rotation Formulas - Open Versus Closed Shapes

Torsion Rotation Formulas - Open Versus Closed Shapes

(OP)
It is my understanding that torsion rotation (angular twist) formulas such as those shown in Section 8.2 of "Design of Welded Structures" by Blodgett are only applicable to closed shapes (such as pipes, round HSS, and rectangular HSS) and open shapes where warping is negligible (such as angles and tee-shapes). For other open shapes, such as wide-flange shapes and channels, one would have to refer to other sources such as AISC Design Guide 9 for proper determination of member rotation in response to torsional loading. Is my understanding correct?

RE: Torsion Rotation Formulas - Open Versus Closed Shapes

That's my understanding. My gut feel is that ignoring warping effects would give an upper bound solution on rotation, if you can live with that.

RE: Torsion Rotation Formulas - Open Versus Closed Shapes

(OP)
Thank you for the prompt response and confirmation.

RE: Torsion Rotation Formulas - Open Versus Closed Shapes

A 3D Finite Element using solid/continuum element could also model this relatively easy with warping taken into consideration. Obviously, not everyone has access to that, but it's a possibility.

RE: Torsion Rotation Formulas - Open Versus Closed Shapes

Blodgett would be conservative on rotation, but you might overstress the member.

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