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Could you please tell me how to use ZeroLengthSection Element in STKO? I hope to use it to simulate the bond slip of rebar. I hope those who know how to use it can give me some guidance or suggestions. Thank you very much

Please check our manual and the forum using search.
In addition please watch our training courses:
https://asdeasoft.net/?stkowebinars-for-opensees
Nr. 7 of the advanced and nr. 14 of the getting started explains you how to model zero length.

As Lucy said, you can watch these webinars to understand how to use interactions to model zero-length elements.

Nr. 7 of the advanced and nr. 14 of the getting started explains you how to model zero length.

The modeling procedure is exactly the same for ZeroLengthSection.
The only differences are:

• You need to assign a Section (either elastic or fiber) as a Physical Property
• You need to define a local axes which has the local X direction perpendicular to the section plane