×
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

Axial load on partially buried wall

Axial load on partially buried wall

Axial load on partially buried wall

(OP)
Hi,
Not having a lot of experience, I'm looking for a simple approach for the following situation:

I need to design a prestressing bed foundation consisting of 2 parallel concrete walls 128 ft long, 8ft high x probably 16" thick, 7 ft apart. The walls will be buried up to 16" from the top on the outside, and 40" from the top in the center with compacted gravel/sand. Maybe considering a plain concrete floor in the center if necessary.

On top the walls, and perpendicular to them, is welded a light metal structure consisting of a 6" channel on edge, at 4 ft o.c. On top of these, in the center, running parallel to the walls is a plate 1/8" thick x 13" wide whose edges are supported by 4" channels on edge.

Loads: A moment at each end, tending to uplift the ends of the walls, 1,630,000 lbs-ft, situated at 13.5 ft from each end.
Plus a 243 kip axial load compressing towards the center, applied at the top of each wall also at 13.5 ft from each end.

QUESTION: Can these walls be considered as having continuous lateral bracing, so that I can provide reinforcement only for the uplifting moment, and not have to worry about the axial loading?

Any advice would be very much appreciated.
Thanks!

RE: Axial load on partially buried wall

Quite likely yes, but one would have to go about the numbers to prove it. Of course and to help in that intent the channels should be welded to plates anchored to the top of the walls.

Anyway you can model the thing, the prestress trough the equivalent loads in FEM, even with some degree of initial imperfection, and assuming some degree of lateral spring reaction of the soil on the walls, include P-Delta and see about the general stability of the outfit.

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