I have a simulation performed by plaxis 2013 , which collapses and it does not converge properly. I would appreciate it if someone could give me an idea of the problem.This is a model of the wind turbine foundation where I’ve used the Mohr-Coloumb constitutive model for modeling the soil around the foundation, and the plate element technique (and their extrude) for the modeling of the foundation. The modeling has three steps:1- The first step: calculating the initial stresses2- The second step: defining and modeling the foundation of the structure3- The third step: applying the loadDuring the analysis of the model, at the step of applying load on the foundation, the soil around the foundation uplifts and foundation deformation is positive while it seems the problem does not relate to the load value. I have also tried to add a negative interface between the bottom of foundation and the soil which did not impact the result.I am looking forward to hearing any idea on the probable problem on my modeling procedure and/or boundary conditions,Thanks in advance
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.
Hi
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
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
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.
Thank you very much for your response
The process of geometric modeling of wind turbine base is done as followsI used pairs of rings to create a frustum pyramid (right shape) and draw circles. This may be the reason for the modeling errorIs this simulation correct? And can you advise me on how I can model the left shape in Plaxis 2013?