Problems Encountered in Seismic Time-history Analysis Using Zero-length Elements

[STKO Team]

Please describe in detail what is your issuse, using screenshot of the output vs what you would expect

[michael-GA]

Hello!
I apologize for the confusion in my previous response. Let me re-explain the issue I encountered:
I attempted to build a multi-degree-of-freedom model connected by curved springs in STKO and perform dynamic time-history analysis on it. Between each mass point in the model, I set up twonodelink elements. Since the translational perpendicular to the axial direction and rotational movements of this element are coupled, it is beneficial for me to analyze the translational displacement of each mass point caused by the deformation of the curved spring. However, after completing the time-history analysis of the model, an unreasonable deformation mode appeared in the results. The curved spring on the first floor worked normally, but the curved springs on the second floor and above seemed not to be activated, and the mass points on the second floor and above moved in the same way. Therefore, I would like to consult how to solve such a problem. (I have uploaded the model file and the recorded video of my results to the attachment.)
I am looking forward to your reply and guidance!
Thank you!

[STKO Team]

The values for translational and rotational stiffnesses are quite strange, did you try an eigenvalue analysis before?

[michael-GA]

The values for translational and rotational stiffnesses are quite strange, did you try an eigenvalue analysis before?

NO，i have not try it