×
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

RC Walls reinforcement ties
2

RC Walls reinforcement ties

RC Walls reinforcement ties

(OP)
Hi,
I am designing an RC wall with reinforcement layer near each face, do I need to provide crossties through the thickness of the wall?

I have read the ACI318-11 14.3.6 limit for 1% of the vertical reinforcement, is there a similar limit in AASHTO or other overseas codes like the ?

Thanks.

RE: RC Walls reinforcement ties

Ties in walls are rare, and they are required only in highly stressed areas.  You would need to provide more information in order to get a sensible answer.

RE: RC Walls reinforcement ties

Only for high compression loads. The concrete code which I use requires it when the stress is greater than 0.6*0.85*fc. I have only seen engineers provide these ties when the compressive stress under permanent loads exceeds this limit. The 0.6 is a strength reduction factor which varies code to code.

RE: RC Walls reinforcement ties

@MK1000 - Ref. ACI 318-05. Lateral reinforcing requirements for reinforcing (verticals in columns / pedestals and longitudinal in beams) are applicable only if the reinforcing is used as compression reinforcement. Not every vertical member subjected to axial + bending is a compression member for detailing purposes.
If the subject wall can be designed using the empirical method of Chapter 14, you don't need cross ties for vertical reinforcing.
Moreover, the  axial strength equation (14-1) is based on concrete strength, cross-section, and slenderness of the wall; reinforcing does not figure in.
You may also compare eqn. (14-1) with eqn. (22-14) given in structural plain concrete section of the code.

RE: RC Walls reinforcement ties

(OP)
@asixth - which code do you use?

If I have to provide ties, are these ties similar to column ties or maybe less stringent? In my case it would be unpractical to specify column ties !

Thanks guys.
 

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