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


Group Pile & Cap Bearing

Group Pile & Cap Bearing

Group Pile & Cap Bearing

Good Day!

I was assigned to determine the bearing capacity for a group of drilled shaft/bored piles. I used AASHTO LRFD 2012 as basis for my design. The cap would be 5m x 5m with 4 to 5 piles of 1m diameter. The cap thickness would be 1m to 2m.

Is it correct that I based my reduction factor for piles on the least center to center dimension with respect to pile diameter?

What are good references when I want to consider the cap bearing capacity?

How will I consider the cap bearing capacity?

Also what are the parameters I need in order to determine the load that the cap will carry?


RE: Group Pile & Cap Bearing

The reduction in efficiency of a pile group is based on pile spacing, not pile diameter.

Bearing capacity of the cap is based on the allowable concrete bearing stress where the pile is supported by the cap.

Check one way shear, punching shear and flexure of the cap spanning over the piles.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close