Seismic Analysis Error in OpenSees SP using LK Bottom Condition

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Zhou_Jx
Posts: 47
Joined: Wed Mar 16, 2022 12:15 pm

Seismic Analysis Error in OpenSees SP using LK Bottom Condition

Post by Zhou_Jx » Mon Apr 10, 2023 9:53 am

Dear STKO,

I am writing to seek your advice on an issue I have encountered while conducting a seismic analysis using OpenSees SP.

Specifically, I have defined a Lysmer-Kuhlemeyer (LK) bottom condition to implement the seismic input in my numerical model for a soil domain. However, when I attempt to run the analysis, I receive the following error message: 'WARNING ZeroLength::setDomain() - Nd1: 2 does not exist in model for ZeroLength ele: 6052.' (Please see the attached image for further information).
error openseessp.jpg
error openseessp.jpg (98.06 KiB) Viewed 1847 times
Interestingly, when I change the solver to OpenSeesmp, this error is eliminated. Moreover, I have also noticed that in Youngkyu's quick questions forum (viewtopic.php?f=39&t=1953), a similar LK bottom boundary is adopted, and when I run his model in OpenSees SP, the error is not raised.

Therefore, I suspect that there may be some additional errors in my model, which are causing this issue. I would be grateful if you could offer some guidance or suggestions on how to resolve this error.

Thank you very much for your time and assistance.

Sincerely,

Jiaxing

My model is here:
Soil domain.zip
(284.85 KiB) Downloaded 101 times

STKO Team
Posts: 2257
Joined: Tue Oct 29, 2019 8:45 am

Re: Seismic Analysis Error in OpenSees SP using LK Bottom Condition

Post by STKO Team » Thu Apr 13, 2023 8:05 am

OpenSeesSP has some limitations. For example, adding the LK springs on a second stage (i.e. when the model has been already partitioned) will try to add the new elements only on the first processor, and some nodes may not be there.

Have a look at the ASDAbsorbingBoundary. It should solve this issue and it's also easier to use

Zhou_Jx
Posts: 47
Joined: Wed Mar 16, 2022 12:15 pm

Re: Seismic Analysis Error in OpenSees SP using LK Bottom Condition

Post by Zhou_Jx » Thu Apr 13, 2023 11:20 am

Thanks for your reply.

STKO Team
Posts: 2257
Joined: Tue Oct 29, 2019 8:45 am

Re: Seismic Analysis Error in OpenSees SP using LK Bottom Condition

Post by STKO Team » Thu Apr 13, 2023 1:06 pm

You're welcome

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