×
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

CMU Flush Wall Pilaster Ties

CMU Flush Wall Pilaster Ties

CMU Flush Wall Pilaster Ties

(OP)
I have a 20ft tall 8" cmu wall with a 2" eccentric point load on it at the top.  I have run the design based on Amrhein's book and have determined that I need (2)-#5 verts right below the bearing plate.  My question is - how do I know if I need to specify lateral ties around those (2)-#5 verts? Thanks!

RE: CMU Flush Wall Pilaster Ties

Ties are required only for comression reinforcement.
Ref ACI 530-02: Pilasters, section 2.1.7.2 - Where vertical reinforcement is provided in pilasters to resist axial compressive stress, lateral ties shall meet all applicable requirements of section 2.1.6.5,(lateral ties in columns).  

RE: CMU Flush Wall Pilaster Ties

(OP)
I did see that section in the code.  So, are the ties required because I have a moment due to axial(compressive) load. therefore it is compressive reinforcement?  I guess I am asking what is the definition of compressive reinforcement.

RE: CMU Flush Wall Pilaster Ties

The effective width of the wall resisting the point load is width of the bearing plate plus four times the thickness of the wall.
Distribute the vertical load and the moment due to eccentricity over this effective width of the wall. For walls subjected to axial load + flexure, reinforcing is normally required only for tension due to bending and therefore ties are not required.  

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