×
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

caisson reinforcement

caisson reinforcement

caisson reinforcement

(OP)
I am looking at a design of a caisson (two in total) supporting a sign.  The caisson is 4 feet in diameter and is embeded 14 feet.  The column for the sign is a W shape and extends to the bottom depth of this caisson.  There is no reinforment in this caisson.  Is it required?  What guides the design of this reinforment if it is?  Thanks for any help.

RE: caisson reinforcement

Try ACI-318.  Chapter 22 is a section for structural plain concrete.

RE: caisson reinforcement

I'm not sure if they still show it, but the older CRSI manuals used to show the caisson reinforced to a depth of 3 x caisson diameter, or 10 feet, whichever was more.  The reinforcing was temperature only, and caisson was designed as plain concrete.  Reinforcement ratio was 0.005 x area.

RE: caisson reinforcement

For a sign with this depth footing, I would expect the critical loads to be lateral due to wind.  You might consider dropping in a spiral cage or WWF for good measure, depending on the the size of the W section and soil.  

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