×
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

additional moments in slender columns

additional moments in slender columns

additional moments in slender columns

(OP)
When checking reinforced concrete columns for an existing structure, is it acceptable to use the actual deflection of the column as given from the finite element model to calculate the additional moment due to the slenderness of the column?

I am modelling a concrete jetty structure in STAAD. If I use the deflection of the column given in BS8110 to calculate the additional moment then the piles fail. If I use the deflection of the column that comes out of the model then the piles are ok.

The structure is existing - there is no evidence of structural failure of the columns, and I am loathe to have to suggest that extensive strengthening work is carried out to the columns if it is not necessary in reality.  

RE: additional moments in slender columns

Short answer - no.

The code is there for a reason.  You're going to have to figure out a way to strengthen it or justify why the code does not apply to you.  "But the model said I could ignore the code" will probably not hold up in a court of law...


If you "heard" it on the internet, it's guilty until proven innocent. - DCS

http://www.eng-tips.com/supportus.cfm

RE: additional moments in slender columns

LOL, ACI needs to develop a Direct Analysis Method for concrete columns!!

It's been 4 years since I saw an ACI Code.  Is there not an "out" in there somewhere that lets one use measured or known properties or "rational analysis" instead of the typical Code equations?  If not, then there needs to be!

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