Interface element

[Aliyaghfoori]

Dear STKO

I am working on modeling an underground reservoir.
For simulating the interface between soil and concrete beam elements, I am using the **ZerolengthContactNTs2D** element.
If I intend to manually define the interface element node by node(script) , how should the nodes of the interface element be numbered as shown in the attached diagram?

[STKO Team]

Just follow the documentation in OpenSees:
https://opensees.berkeley.edu/wiki/inde ... ntactNTS2D

We've never used that element though