×
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

concrete tank design tables

concrete tank design tables

concrete tank design tables

(OP)
(I also posted this in the Civil/Environmental, but wasn't sure where I would get a response.)
I am designing a rectangular concrete tank using the pca design guide.  I would like a little more explanation on the design table in the appendix.  If I go in with a certain Mu/Phi(f'c)bd2, which sigma do column do I use to find omega?  Do I assume a sigma first?  It appears that their examples use a sigma of 0.001.

RE: concrete tank design tables

(OP)
I realized after I posted that I confused sigma with rho.  I was referring to the steel ratio.  Sorry for the confusion.  Also, sorry about posting twice.  I've never used this forum before.
thanks

RE: concrete tank design tables

There is a good explanation at the bottom of Appendix A to which you are referring.  

If you are designing, enter the table with Mu/(phi*f'c*b*d**2); find omega and compute the steel percentage required, rho, from rho=omega*f/c/fy

If you are investigating a design, enter the table with omega; find value of Mn/(f'c*b*d**2) and solve for the nominal strength Mn.

RE: concrete tank design tables

(OP)
When finding omega, I enter with the value on the left side of the chart.  As I travel right across the columns, how do I know which column to pull omega from (i.e. .000, .001, .002, etc.)?  It appears the examples use .001, but I am not sure if that is always typical or not.

RE: concrete tank design tables

The left to right values across the top are further refinements to the vertical columns.  The left to right values allow you to go to additional accuracy.  The chart does not explain that at all but if you look at it you will see what I mean.

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