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

Renovating Existing Concrete Beam

Renovating Existing Concrete Beam

Renovating Existing Concrete Beam

Can anyone lead me to literature that would apply to cutting an existing 10" wide by 96" deep concrete beam in half (depth) and adding external reinforcing to strengthen the beam.  The initial thought is to bolt channels to each side of the beam and then cut the bottom of the beam off.  The channels would act as tension reinforcing.  All stirrups would be cut; how to reinforce for shear?  Will Channels act as shear reinforcing also?

Or just design the channels to support the entire load and use the concrete beam as a giant spacer.  Load will be transferred from concrete beam through channel fasteners to channels.  Any thoughts?  Thanks.

RE: Renovating Existing Concrete Beam


Or just design the channels to support the entire load

Yes - if you cut half the beam off depth-wise this is what you'll have to do.  Keep in mind that there would also be load-transfer to the channels so there would be an instantaneous deflection of dead load downward.  Might need some pretty stiff channels to keep these deflections under control.


RE: Renovating Existing Concrete Beam

A 96" deep concrete beam is a seriously major structural element.  In reducing its depth by half, I agree that the new structure should support the entire load, but doubt that available rolled steel channel sections will do the job.  Does this beam have a lateral loading function as well as gravity?

RE: Renovating Existing Concrete Beam

Can the channels transfer the reactions to the supports at the ends? The ends of the beam will be compromised beyond use for shear transfer.

Timing has a lot to do with the outcome of a rain dance.

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