Search found 12 matches

by miran
Wed Jun 17, 2020 9:23 am
Forum: OpenSees MP
Topic: Parameter study
Replies: 1
Views: 198

Parameter study

Hi, Is it possible to set up a parameter study in STKO? Say I have a model which is subjected to a harmonic load with a certain frequency (time series). However, i wish to analyze the same model but I only wish to change the time series. Is it possible to set up such procedures so that several a .mp...
by miran
Fri Jun 12, 2020 11:46 am
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Re: Transient analysis using contact elements

Just one quick note regarding my model; in the model that I sent to you, I forgot to implement LK boundaries between pile tip and bedrock.
by miran
Fri Jun 12, 2020 8:16 am
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Re: Transient analysis using contact elements

Sure, thank you! Clearly, Lagrange works fine for static problems. From what the literature tells us, I was expecting noise for high-frequency excitation. However, it seems noise occurs for dynamic problems in general when using implicit integrations. Contact formulations, both penalty and Lagrange,...
by miran
Wed Jun 10, 2020 2:44 pm
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Re: Transient analysis using contact elements

Dear STKO Team,

Did you get chance to have a look?
by miran
Thu Jun 04, 2020 9:44 am
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Re: Transient analysis using contact elements

Regarding static analysis. No, I did a linear static analysis with one increment for the constant gravity loads (linear because the non-linear contact elements are added at a later stage and all other elements are linear). Also, I used the initial state analysis, so that the displacements before the...
by miran
Wed Jun 03, 2020 11:21 am
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Re: Transient analysis using contact elements

Thank you for the reply, I have in fact used the TRBDF2 scheme as OpenSees recommends, and it does seems to work for the larger time step. However, small time steps produce large noise in the displacements. This is very strange. Regarding the convergence criteria. Like you stated, the right hand sid...
by miran
Mon Jun 01, 2020 2:22 pm
Forum: Interaction
Topic: Transient analysis using contact elements
Replies: 10
Views: 923

Transient analysis using contact elements

Dear STKO Team, I read in a previous post that you are preparing a tutorial on soil-pile interaction. Will you including transient solutions? Meanwhile, I have a few issues with my soil-pile analysis that I hope you can comment on. An appoligy in advance for what became a long post :D 1) Issues with...
by miran
Sun May 31, 2020 11:50 am
Forum: Interaction
Topic: soil-structure interaction continuum model
Replies: 12
Views: 969

Re: soil-structure interaction continuum model

Actually, that would not be correct. The stiffness in ContactMaterial3D pertains to interface between two bodies . The formula you are referring to applies for isotropic materials. Stiffness parameters of one single material and stiffness parameters related to the interface between two bodies are tw...
by miran
Sun May 31, 2020 9:36 am
Forum: Interaction
Topic: soil-structure interaction continuum model
Replies: 12
Views: 969

Re: soil-structure interaction continuum model

Hi vokumus, ContactMaterial3D is essentially an elastic-perfectly plastic material. My understanding is that the interface stiffness G is just the stiffness of the elastic part of the slip (sometimes referred to elastic stick), which is of course always tangential to the contact master surface. This...
by miran
Sat May 02, 2020 2:48 pm
Forum: Property
Topic: Problem adding new element properties
Replies: 4
Views: 455

Re: Problem adding new element properties

ADDITIONAL INFO! [*]I have tried to run the file from the E-learning sites (https://asdeasoft.net/?stkowebinars-for-opensees). The element properties are all there together with everything else, but the analysis won't run properly. That is to say, all the tcl.-files are written, but it seems that t...