Contact US

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!

*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

Replacing A Steel Composite Beam

Replacing A Steel Composite Beam

Replacing A Steel Composite Beam

Does anyone know of a method for replacing a corroded steel beam that is composite with the concrete slab above? Is it possible to cut the existing beam out when it's attached with dozens of headed studs? If that could be accomplished, can you retrofit anchor the new beam to the existing concrete to achieve composite action again? Or just design the new beam as a non-composite beam if space allows? Alternatively, could the slab above be broken out locally to the beam and re-poured without the new cold joints diminishing the capacity of the slab? Thanks in advance!

RE: Replacing A Steel Composite Beam

Does the new beam have to be composite?

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates


RE: Replacing A Steel Composite Beam

You could do the following:
1. Install a new beam adjacent to the corroded beam, or two new beams on each side.
2. Set new beams tight to the underside of the slab.
3. Decided if you absolutely must make the new beams composite. This may not be necessary and may be desirable to avoid higher costs.
4. If composite, you can core down from above through the slab to the top of the new beam(s) and install studs from above. Cores would have to be large enough to allow for the welding gun access.
5. Fill the cores with non-shrink grout.
6. If appropriate, cut away the old corroded beam - possibly leaving the top flange in place. Or just leave the old beam there if that works for you.

Note that the new beams, if composite, won't behave like the original beams which were spanning with the dead weight of the wet concrete before hardening/composite action took over.
But the ultimate strength of the composite beam would be unaffected by that.

If you don't do the coring/composite studs then the new beams could be fabricated with top flange holes to allow some nominal fastening (concrete screws, etc) to at least provide some positive attachment to the slab for lateral bracing purposes.

RE: Replacing A Steel Composite Beam

JAE... your procedures are great.

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates


RE: Replacing A Steel Composite Beam

Instead of welding studs, could one use bolts with a nut above and below the flange?

Alternatively to that.... (if say, the top is not accessible) Could anchors be installed from below?

Any reason that they can not shore the existing beam prior to installation of the new beams?

What part of the existing beam is corroded? IF it is at the concrete interface, I'm wondering if corrosion will continue (and cause problems with separation or something like that).

RE: Replacing A Steel Composite Beam

I suppose you could use bolts/nuts but stud welding from above is much quicker with less labor I'd think.

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close