×
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

CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

(OP)
I am designing a storm shelter using fully grouted 8" cmu block reinforced at each face in each cell with #5 vertical bars. The first page of the attached pdf shows my proposed reinforcement layout at bond beam locations over doors where I need the bond beam to be able to span vertically for gravity loads and horizontally for out of plane wind loads. The second page of the attached pdf is rom the Reinforced Masonry Engineering Handbook, 8th Edition. I am wondering if the general consensus would be that the 1/2" allowable tolerance that I am providing between the 1/2" clear cover for grout and the face of my vertical bars is what is being required here... Does anyone see something incorrect about me specifying and designing to these "d" distances?

RE: CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

Design clearance = stated clearance (7.2.4.1) + construction tolerance (table 7.2). Unless fine grout is permitted, the minimum clearance = 1/2" + 1/2" = 1".

RE: CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

I believe you are correct, but also recognize that ASTM C90 spec for block allows a face shell to be 1 1/4" thick.

RE: CMU REINFORCEMENT TOLERANCE REQUIREMENT QUESTION

That layout is pretty tight and somewhat optimistic with regard to rebar placement, especially when you consider construction tolerance. I would try like crazy to make it work with one vertical rebar layer. I would not stagger the horizontal bars.

Your construction drawings should show the rebar where you want it, not where it might be with the construction tolerance.

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


Resources


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