How to model the foundation of the structure with Plaxis 3d (v2013) software?

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

Stefanos Papavasileiou — Mon, 11 May 2020 11:44:31 GMT

Dear Hamidreza,

The question is whether it is important to you and the project to simulate the interaction between the different pieces. If the pieces are fully connected then an interface is not needed. If the pieces can move relative to each other then an interface can be used.

Typically for soil to structure interaction, the interface is required so that it is possible to have a relative movement of the soil. Without an interface, the nodes of the soil will be fully connected to the nodes of the structure.

In both cases, this depends on the engineering and design decisions.

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

hamidreza jafari — Wed, 06 May 2020 08:55:46 GMT

In the following figure, the foundation is modeled in several pieces. Is it necessary to define an interface between the pieces or not?
In addition,Is it necessary to define the interface between soil and foundation or not?

thanks for your attention

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

Stefanos Papavasileiou — Tue, 28 Apr 2020 07:32:58 GMT

Dear Hamidreza,

Rushan is correct, the cone command is available for PLAXIS 3D 2013.

Here is a video on the loft polycurves feature showing how easily this can be done with PLAXIS CONNECT Edition:
https://youtu.be/-ADE7b1B_8U

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

Rushan Gizzatullin — Sun, 26 Apr 2020 18:09:20 GMT

Dear Hamidreza,

In the current 3D CONNECT Eiditon version we have a good Loft polycurves option. For this option we need only two circles (polucurves).

As an alternative, we can use command cone, which allows to creat a cone (volume) with radius, height and top circle base parameters. For more information please see Command Reference: Help — Command Reference — Input — Input commands reference — cone.

Moreover, this command has possibility to create truncated cone. Below you can find the screenshot from Command reference:

Unfortunately I do not know, if this option is available in 3D 2013 version.

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

hamidreza jafari — Sun, 26 Apr 2020 08:23:35 GMT

Thank you very much for your response

The process of geometric modeling of wind turbine base is done as follows
I used pairs of rings to create a frustum pyramid (right shape) and draw circles. This may be the reason for the modeling error
Is this simulation correct? And can you advise me on how I can model the left shape in Plaxis 2013?

RE: How to model the foundation of the structure with Plaxis 3d (v2013) software?

Stefanos Papavasileiou — Wed, 22 Apr 2020 14:24:48 GMT

Dear Hamidreza,

We no longer support PLAXIS 3D 2013 as we have released 6 newer versions with lots of improvements and new features. Our currently supported versions are PLAXIS 3D CONNECT Edition V20 (Update 2) and PLAXIS 3D 2018 version.

In general, in order to find out what the mechanism for failure is, and so possibly determining the cause, these Output plots should be inspected:

deformed mesh
total displacements (shaded plot)
incremental displacement (shaded plot and/or arrows)
total deviatoric strain (shaded plot)
incremental shear strains (shaded plot)
Plastic Points plot
when applicable: excess pore pressure plot

A combination of these plots will usually give insight into what is happening.

Note that a big role is also played by the constitutive model used. The Mohr-Coulomb is a linear elastic perfectly plastic model with a Mohr-Coulomb failure criterion, which can explain the reason for the unrealistic uplift you see in the results.

Please consider upgrading your version so that we can assist you further with your project. To request for an upgrade, please submit a Service Request following the link here: https://apps.bentley.com/srmanager/