×
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

Strength reduction for Crimped Pipe connection?
3

Strength reduction for Crimped Pipe connection?

Strength reduction for Crimped Pipe connection?

(OP)
I'm analyzing an existing structure. The engineer used pipe sections for horizontal bracing. The ends of the pipes are crimped flat and bolted to the main structural members.

Is the pipe section reduced in strength? Effectively, it seems to me, the Sx at the flat section is the same as two pieces of flat strap.

I appreciate any insight on this, or any other considerations I might be overlooking.

Thanks, DD

RE: Strength reduction for Crimped Pipe connection?

I would be concerned about the connections...  Are they concentric?  There have been alot of failures over the years attributed to eccentric connections.  See this link for a decent summary of the concern:
http://www.microstran.com.au/lmc_brac_cleat_comp0.htm

About your question proper; there has been alot of research into this field.  I'm not very familiar with it personally, but have a coleague who is.  I believe there's a good book on the design of these connections out of Europe.  I'll make some inquiries around the office for you...

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...

RE: Strength reduction for Crimped Pipe connection?

I think the intent is probably that it is a pinned connection laterally, so the reduced section modulus is not a drawback necessarily.

RE: Strength reduction for Crimped Pipe connection?

(OP)
youngstructural- Yes, the connections are slightly eccentric, already made note of it.

JStephen - I believe you are correct, these members are horizontal only and other loads are transferred by extensive cable bracing.

Thanks!

RE: Strength reduction for Crimped Pipe connection?

I'd follow the AISC or the steel code where you're from,    checking local instability , gross area and net area.  If they are only crimped at the ends, you don't have to check the crimped section for buckling since buckling occurs in the middle of the member.

RE: Strength reduction for Crimped Pipe connection?

(OP)
That's it...
Thanks UcfSE, that's the common sense I didn't want to simply accept before I had asked some questions.

I will analyze as pinned and design for max moment at center span.

-DairyDesigner

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