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


Plate Bearing Test

Plate Bearing Test

Plate Bearing Test


Plate bearing test applies load to the ground via a 300mm x 300mm steel plate. From the test, the load vs settlement and time vs settlement plots are given.

From the plate bearing test, how to get:

1. Ultimate bearing capacity for an actual footing with a size much bigger than the steel plate ?

2. What is the settlement of the actual footing under service load?

3. Any difference between clay and sand ?


RE: Plate Bearing Test

I assume you are referring to ASTM D1194.
To your question, you can't extrapolate your load test data too far beyond your test parameters. Don't try to use results from 1ft x 1ft on anything bigger than a 3 ft x 3 ft spread footing. For a 1ft x 1ft plate, your results are valid for 2 - 3 feet depth. Not too meaningful for most multi-story structure foundations.
Settlement estimates should be based on sufficient subsurface exploration, lab tests, and geotechnical calculations.
In general, plate load test results are abused more often than not.

RE: Plate Bearing Test

I have an old article on the subject concluding that the test is most suitable for sands, but no limit on the ratio of plate to footing size. He concludes the methods then for extrapolating to footings were UNSATISFACTORY. If you can find this article it may help. Some correlation to N values is presented also. I've used the test rarely and then applying a generous safety factor. I would run two tests on one location with significantly different plate sizes to assist in the extrapolation..

Parry, R.G. (1948) Geotechnique28, No 1. 107-118

RE: Plate Bearing Test

There have been quite a few theeads on the use of plate load tests. Why not search on the site for them?

RE: Plate Bearing Test

I think Bowles book has some information about plate bearing test and correlations to actual footing sizes. But as mentioned above you have to be careful when extrapolating the plate results to your actual footings... especially for clays.

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