p-y curves in plaxis?

Dear Jamal,

From your description it is not really clear to me but I guess you would like to compare the results of a laterally-loaded pile from a method using p-y curves and the results in PLAXIS 3D.

If so, yes, you can do that.

For example, our PLAXIS Monopile Designer can import p-y curves based on API guideline and calculate the pile in a 1D model, which then you can compare with the PLAXIS 3D results.

Note that PLAXIS 3D does not use p-y curves for the calculation.

Jamal,

The y is the lateral deflection of the structure, and the p is the soil response in lateral Stress per unit width length of the structure. To determine the lateral stress you'll need to add up all the lateral soil stresses acting on the pile at the location of the lateral deflection. Unfortunately this is not as easy as it sounds. The paper by Wolf et al (https://www.osti.gov/etdeweb/servlets/purl/22119056) describes some of the complexity involved. I suggest extracting the normal forces from an interface element and resolving the forces in the direction of the deflection.

Also note that the deflection is a function of the structure stiffness AND the soil stiffness, so makes sure when you're comparing with the literature that you're modeling the same structural stiffness.

Good luck,

Martin

Can you advise me on how to import the p-y curves based on API guidelines? I cannot find the way in the user manual.
I think that I have to prepare a text file for p-y curves. Please also advise the format for the text file.

Dear Akira Nakashima,

In order to assist you with explaining the details of what parameters to be provided and the format of the imported file, please raise a SR using the link below. We will help you with this: https://apps.bentley.com/srmanager/ProductSupport

Note that we are still working on improving the documentation on this subject and it will be provided in the future version of the manual.

Thank you, Mr. Manh. I will do so.