×
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

Hi all, Are the reduced superstr

Hi all, Are the reduced superstr

Hi all, Are the reduced superstr

(OP)
Hi all,

Are the reduced superstructure earthquake forces and moments, resulting from the application of appropriate Response Modification Factors, used when analyzing groups of piles?

VOD

RE: Hi all, Are the reduced superstr

VoyageofDiscovery,

No, the pile group (or any foundation for that matter) must be calculated with an R-factor of 1.0 (i.e. elastic) or the plastic moments generated by the column(s), whichever is smaller.  This is based on the capacity design approach, where it is assumed that you'll hit one of the two criteria before the other.

Each case is different, but more often than not the plastic loads govern.  The R-factor reduction should only be used where energy dissipation is to be expected, and piles typically are expected to remain elastic.

I hope this helps.

RE: Hi all, Are the reduced superstr

(OP)
bridgeman1,

Thanks for your response, I see the forest from the trees:)

Regards

VOD

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