×
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

Cw for a solid rectangular bar

Cw for a solid rectangular bar

Cw for a solid rectangular bar

(OP)
Is the value of Cw for a solid rectangular bar zero?

RE: Cw for a solid rectangular bar

It's close enough to zero that it's usually taken as zero I think.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Cw for a solid rectangular bar

Just for clarification... Cw is the warping constant right?

It's called up as Iw in Australian codes.

RE: Cw for a solid rectangular bar

If we are talking about the warping constant, then I believe it is usually neglected for closed sections (or in your case solid sections) since the warping constant is usually quite small relative to the torsion constant "J". The same is not true for open sections, where both the warping constant and torsion constant are used to determine the member (buckling) capacity of beams subject to bending.

Similar to Trenno, my experience is with Australian codes only.

RE: Cw for a solid rectangular bar

(OP)
Cw is defined in the Canadian Standard CSA S16.1 as the "warping torsional constant" and is used in the formula for the critical elastic moment of an unbraced member, when computing the resisting moment of a laterally unsupported member.

RE: Cw for a solid rectangular bar

I recently designed a flat plate to act as a beam (about it's major axis). In regards to finding the member capacity, I assumed Iw = 0 in the following equation.

RE: Cw for a solid rectangular bar

(OP)
From where is that equation taken?
If you assume Iw=0, that is the same as assuming Cw=0 in the CSA S16 equation.

RE: Cw for a solid rectangular bar

That equation is taken from the Australian Standard for steel structures: AS 4100-1998.

Any chance we can see an extract from CSA S16 showing how "Cw" is used? I can only assume the result will be similar.

RE: Cw for a solid rectangular bar

Sorry - yes as jrbaus stated, that extract is from AS4100.

RE: Cw for a solid rectangular bar

(OP)
ok, thanks. When I get into the office I will scan the page and post it. (we had a bit of snow overnight, so it will be slow drive to work...guess you don't have that problem in Australia...my niece lives in Sydney)

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