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Hi, I am not aware of any direct method available in OpenSees. However, you can still achieve it by some custom TCL script or extenal numerical platform, like MATLAB and Python. After developing your model, you can obtain mass and stiffness matrices as well as modal properties (frequencies and ...

Hello everyone, does anybody know how to do a linear modal time history analysis in OpenSees? This will be useful in understanding the dynamics of the structure and modal contributions. I know we can do a response spectrum analysis but a time history is more of what I need. Thanks a lot for the ...

Hi, I was trying to do the partition in STKO v3.3.0 but found out the resultant number of partitions was not always the same as my input. To demonstrate the issue, I am attaching a small model for testing purposes. For this model, I would only get 6 partitions even though I have requested 8, and my ...

Oh got it, thank you for the response.

Hi, just want to have a quick follow-up on this?

I see, thanks very much for the explanation.

Hi, I am using the mpco recorder in OpenSeesSP to record only part of my model which is defined using the region command. However, this can lead to MPCRecorder write errors in some occasions. Specfically, this happens when I put the mpco recorder between the first gravity initialization phase and ...

Hi, sorry for the delayed response, I was much bogged down by other appointments. Attached please find an minimum example of 2D PML elements that leads to Segmentation fault during runtime. The analysis can proceed by commenting out the "recorder mpco ..." line, indicating the Segmentation error ...

Hello STKO team,

I was trying to record results for the PML elements implemented in OpenSees ( https://github.com/OpenSees/OpenSees/pull/503 ). The mpco recorder seems to work for the 3D PML elements (8-node element) well as shown in the attached image "PML3D.png".

However, it does not work for ...

I see, thank you very much for this very helpful explanation!!