×
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

Box section under Torsion and bending.
2

Box section under Torsion and bending.

Box section under Torsion and bending.

(OP)
I am having an issue finding a good guide or explanation of how to to apply design calculations to my loading conditions. Most guides/ standards etc describe methods for open section beams.(I beams etc) but i want to use square box section as it is renowned for standing up to torque and twist. I need to justify my selection.

I'm fine with simple bending calcs and torsion calcs( well i don't remember torsion being an issue at university anyway) but i've never designed for both.
Here is a basic sketch of my application:



Can anyone help with how to approach this?

The closest thing i can see in literature is to assume an eccentric load to the bottom section of the beam to twist. Obviously as an equivelent load to cause the same moment caused by the load on the verticle beam.

RE: Box section under Torsion and bending.

it's easy enough ... torsion on a closed section (google that if you've time) prodcues shear stresses = T/(2*[A]*t) where [A] is the area enclosed by the mid-plane, something like (b-t)*(d-t). and add shear stress to normal stress (from bending) to determine principal stress.

Quando Omni Flunkus Moritati

RE: Box section under Torsion and bending.

I recommend reading H3.2 of AISC 360-10. It is a free download from AISC if you do not have a copy of the Steel Construction Manual.

Equation (H3-6) specifically deals with the combined effects of axial, flexural, shear, and torsion effects.

RE: Box section under Torsion and bending.

(OP)
Thanks for the Tips guys. No doubt i'll be back on after trying this all out.

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