Modal Analysis + Mass Partiticipation Factors

marafini.f
Posts: 363
Joined: Fri Nov 13, 2020 1:52 pm

Re: Modal Analysis + Mass Partiticipation Factors

Post by marafini.f » Thu May 06, 2021 7:55 am

I am happy you managed!
Enjoy your modelling
Francesca

akshaysomkuwar123
Posts: 29
Joined: Mon Apr 05, 2021 4:20 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by akshaysomkuwar123 » Thu Dec 01, 2022 10:58 am

Hello
I wanted to know if modal and response spectrum analysis is added to the recent version of opensees ?

STKO Team
Posts: 1979
Joined: Tue Oct 29, 2019 8:45 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by STKO Team » Fri Dec 02, 2022 10:57 am

Yes, they are already in the official opensees

akshaysomkuwar123
Posts: 29
Joined: Mon Apr 05, 2021 4:20 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by akshaysomkuwar123 » Tue Jun 06, 2023 5:38 am

I am trying to run the example of response spectrum available on https://opensees.github.io/OpenSeesDocu ... ctrum.html, in tcl, however it is giving an error of invalid command as shown in the figure.
Attachments
responseSpectrumerror.png
responseSpectrumerror.png (44.17 KiB) Viewed 18115 times

STKO Team
Posts: 1979
Joined: Tue Oct 29, 2019 8:45 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by STKO Team » Wed Jun 07, 2023 10:06 am

Just change the "responseSpectrum" command with "responseSpectrumAnalysis".
We recently changed the name and updated the documentation. However the official documentation still has to be re-compiled

akshaysomkuwar123
Posts: 29
Joined: Mon Apr 05, 2021 4:20 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by akshaysomkuwar123 » Thu Jun 08, 2023 1:05 am

Thank you for the reply
Understood.
I am currently trying to do response spectrum analysis for 4 storey building to understand the output and trying to record accelerations. Currently using the same response spectrum from the example, the acceleration recorded for every mode is same.
The following snap shows the model along with time period of each mode and recorded acceleration and commands used for recording.
How should be acceleration recorded, the above recording commands seems to be not working ?
Attachments
4_storey_building.png
4_storey_building.png (20.42 KiB) Viewed 18088 times

STKO Team
Posts: 1979
Joined: Tue Oct 29, 2019 8:45 am

Re: Modal Analysis + Mass Partiticipation Factors

Post by STKO Team » Wed Jun 28, 2023 2:55 pm

Response spectrum is not a real transient analysis. You cannot record accelerations as in a transient analysis

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