×
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

Threaded Rod Hanger Capacity

Threaded Rod Hanger Capacity

Threaded Rod Hanger Capacity

(OP)
Hi all,

Ive got the following situation:

A 4.3m threaded rod is anchored to a composite concrete slab and this is divided into two sections of 2.15m connected by a M10 coupler. Assumming this rod is of Grade 8.8 and is also M10, how should I proceed to calculate its capacity? Would I have to consider the tensile load resistance, the concrete pull-out resistance and/or the coupler's resistance? (Both Preloaded and Non-Preloaded Conditions are to be considered. This is for the retrofitting of a BallRoom ceiling expected to carry gymnasts and lighting systems, etc).

I did my years in academia under the Eurocode, but now working in Asia, we follow quite a few codes, so any help is welcomed (if explanation could be in metrics would be preferable).

Thank you all in advance.

RE: Threaded Rod Hanger Capacity

hi

Tensile loading in the thread itself, stripping of the thread in the coupler and pullout resistance within the concrete slab.
A simple sketch of your situation might help to achieve better answers, the lengths of the threaded rod seem very long for an M10 thread.

RE: Threaded Rod Hanger Capacity

(OP)
Hi @desertfox,

Thank you for your showing of interest. At the moment I'm out of the office and don't have the photos from the ballroom I'm talking about. If you'll be around, I'm gonna post those pics here.

Be good

RE: Threaded Rod Hanger Capacity

M10 is hardly "structural", so to say. And visually not pleasing. I didn't even know that they came in lengths > 1m.

No matter what codes you follow, actual physics stay the same. If you're talking dynamic loading, better err towards the safe side.
I've specced full bars with threaded ends for a similar application, these exist under a brand name, and come tailormade to length. Maybe worth considering?

RE: Threaded Rod Hanger Capacity

BriceLee,

Questions about threaded rod embedded in concrete are structural (civil) rather than mechanical. This might be better asked in the structural forum.

--
JHG

RE: Threaded Rod Hanger Capacity

Yes. All of the above.

You MUST ensure the M10 rod stays in the concrete for the load and the safety factor and the concrete strength assumed.
You MUST ensure the coupler is adequate for the load and safety factor chosen.
You MUST ensure the M10 itself is adequate for he load and safety factor chosen.

And, an M10 rod WILL NOT carry the dynamic loads of even a child gymnast jumping, leaping, twisting from a M10 rod trying to also carry a ceiling deadload.

You need to assume (personal safety!!!!) a dynamic load of impact and falling loads being "jerked" to a stop irregularly.

RE: Threaded Rod Hanger Capacity

(OP)
Hi all,

Thank you for your replies. I really did not notice this thread was in the Mechanical Eng section.

Also, I did not mention either that this is to be used in a system of hangers. So, every 1.5m there will be a hanger and this will go 'round' a square. Hence, I am just looking to know the capacity of one threaded rod, which I would convert to the actual situation.

Attached are the photos of the actual place:

http://files.engineering.com/getfile.aspx?folder=b...
http://files.engineering.com/getfile.aspx?folder=3...
http://files.engineering.com/getfile.aspx?folder=f...
http://files.engineering.com/getfile.aspx?folder=0...
http://files.engineering.com/getfile.aspx?folder=c...
http://files.engineering.com/getfile.aspx?folder=5...

Thanks

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