×
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

Underground Tanks
2

Underground Tanks

Underground Tanks

(OP)
I recently was asked to review a tank for a precaster that has been using this tank since 1947.  They have installed countless of these under fast food joints and stores during this time. Not one has failed, or cracked for any reason what so ever.  Yesterday a building inspector would not sign of on the tank unless sealed drawings were provided to the county proving that the tank will not fail.  After looking at this tank, with a 3" wall, burried 3'-0" below the surface, the wire mesh provided was not even close to the required amount.  I used a FEA model to get the moments with the soil loads and such.  Any body out there have any idea how to prove this tanks works?
Keep in mind that when it is full the moments on this thing are near zero.  This check is only for construction loads, and just prior to filling.

Thanks a bunch.

Chad Van Kampen P.E.

RE: Underground Tanks

Chad...do some proof testing.  Load test it in place.  You can use a liquid level gauge to check deflection as it will change the volume.

RE: Underground Tanks

the PCA publishes a manual for the design of circular tanks without prestressing and for rectangular tanks.  These manuals are basically worked examples with tables for obtaining coefficients used in the design/analysis process.  

RE: Underground Tanks

(OP)
This manual you speak of by the (Portland Cement Association, or the Precast Concrete Association?) is hard to find.  Does anyone have an expample they could PDF and email it to me?

RE: Underground Tanks

Portland Cement Association, you can find them online by typing that into a search and go to their bookstore. You can buy them individually or as a group, it is much cheaper to buy them as a group ($35 per book or $48 for both).  Try the link below and see if it works.  In order for you to have all the tables required, and all of the addenda, you really need the manuals instead of an email.  

www.cement.org/bookstore/profile.asp?store=&pagenum=1&pos=4&catID=&id=1959

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