×
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

Repairing damaged stirrups

Repairing damaged stirrups

Repairing damaged stirrups

(OP)
So I have a condition where one side of the beam stirrup has had significant rust. See attached for a schematic layout. How do I go about replacing the damaged leg of the stirrup? I understand that there are hook requirements for stirrups per section 7.1 ACI but I don't see a practical way to achieve the hooks. Can I drill and epoxy in a half tie as shown on the sketch replacing one vertical leg of the existing stirrup?

RE: Repairing damaged stirrups

I wouldn't consider doing as per your sketch...too much drilling, depending on adhesive, development in the cover concrete, etc.  Welded splices to the existing may be an option.

RE: Repairing damaged stirrups

That's what I was thinking too.  

Just install a new leg with a hook at the top and weld the bottom to what's remaining.  Simple.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Repairing damaged stirrups

If there is significant rust on one side as your sketch suggests, I would also be worried about the main steel. If you need to replace shear reinforcement, in this instance I would be quite worried

Kieran
 

RE: Repairing damaged stirrups

(OP)
Hokie, Mike, you mean weld the new piece directly to the existing piece or would you rather use a coupler? The problem with coupler is that there won't be enough concrete cover. It would be great if the two pieces can be simply welded together. Are there any guidelines on ACI for welds?

RE: Repairing damaged stirrups

Look at ACI 12.14.3.3 and the Commentary to 3.5.2.  Basically, welded splices are allowed, provided they are done in accordance with the welding code, which in your case I believe is AWS D1.4.  Other than replacing the damaged reinforcement, make sure you determine why the corrosion occurred and do the repair in a manner which will ensure future durability.

kieran1, in many cases the ligatures corrode substantially, enough to cause spalling, without damage to the main bars.

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