asdeasoft.net

Hi,
My name is Thanh. I am trying to replicate this example in STKO. https://opensees.berkeley.edu/wiki/inde ... _Pile_Wall.

My question is how can I remove the soil layers like in this example.

Thank you so much

Dear Thanh,

Now you can remove elements as they did in the official opensees example, i.e. by element ID (this can be done in STKO using a custom script). However this is neither efficient nor general, and requires a good knowledge of TCL.

We are currently implementing a feature (a new AnalysisStep call "removeSubset") that will let you remove a subset of a geometry using different rules:

• Plain (the entire selectionSet will be removed when you issue the command)
• FunctionOfTimeAndSpace (elements and nodes will be removed as function of their spatial coordinate and time)
• FunctionOfElementResult
• FunctionOfNodalResult

This will be ready by the next week. I will inform you here when the new update will be available

Thank you so much

Dear STKO team,

I only knew to add tcl script to STKO in the analysis step. Therefore, I want to ask which feature can I implement tcl script in?

Dear than,
As I said, at the moment you can do it via the CustomCommand (TCL Script).

Attached you can find a (zipped) SCD file where I use the TCL custom command to remove elements and nodes as a function of space and time.

However there are some subtle issues with this approach (that's why we are implementing it in a more robust way directly inside the Python interface of STKO):

• the UMFPack solver does not work when you remove objects (I used the SuperLU for this)
• If you use the Penalty method, you need to remove all sp and mp constraints for every node that you remove (see my scripts)
• You cannot apply point loads on nodes that will be removed

Have a look at this sample file and let me know if everything is clear.

Thank you so much