×
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

ACI 318maximum reinforcement spacing

ACI 318maximum reinforcement spacing

ACI 318maximum reinforcement spacing

(OP)
We do not allow any concrete vertical or horizontal reinforcement to be spaced more than 18" o.c. due to the fact that it is listed as the maximum spacing in ACI 318 in multiple places and applications.  I am specifically interested in any exceptions to 14.3.5 for vertical and horizontal wall reinforcement.  I have a client that is doing an ICF home with a 6" core that he is claiming that he does 24" o.c. spacing all the time.  I can't find any exceptions in the code for exceeding the maximum 18" o.c. spacing for walls.  Anyone know of any exceptions to the 14.3.5 to space reinforcement farther apart?  If not I'll stick to my guns, but he is so adamant, I decided I would do a little more research before telling him I'm not budging.
 

RE: ACI 318maximum reinforcement spacing

The home perhaps falls under the IRC instead of the IBC and this 318 doesn't apply?  Our city code has adopted an amended table to the IRC which replaces the basement wall reinforcing in the IRC with one that has stood for some time.  There are many cases where #5 @ 48" o.c. are specified.

 

RE: ACI 318maximum reinforcement spacing

(OP)
I have looked in the IRC and the ICF tables look like they are going to be able to help me.

Thanks for your help, JAE

RE: ACI 318maximum reinforcement spacing

check the euro code or any other codes they may help ya

RE: ACI 318maximum reinforcement spacing

I remember the classic text of Haas on plates and shells and I remember by then (sixties or seventies) for these thin elements (there and elsewhere) the recommended practice was not to exceed twice the thickness in the separation of mesh rebar. For any ratio of reinforcement this can be attained by reduction of the diameter or the rebar, and at least you know every chunk of concrete has something to which hang. This may seem some horrific thought for the life for some concrete structures but the fall of crowns of vaults is still of concern and I myself have seen both foundations and concrete beam deflections (upon age and creep) of around 5", and about the same where the ratios of the thickness to the span were not properly respected (not precisely a beggar's work, the Ministery of Commerce and Industry in Madrid, Spain). So, the reinforced concrete that started as ferrocement, at closer spaces of wire reinforcement, should to some extent remain so, and it is always better not go for big expanses without reinforcement. Otherwise plank chunks may rain.

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