How can i model a kind of connection or element with different elastic behaviour in the two verses (positive and negative)?

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Victor J. Аdlucky

You can use TRUSS element with non-linear elasticity (with zero stiffness in compression and desired stiffness in tension, like a cable)

Domenico Montenero

Thank you for the answer Me Adlucky.

I will try as you suggest.

Thanks again.

Karthigeyan . S

I suggest you to use interface element at the connection point and define the stiffness of the connection face to simulate the interaction b/w two faces..you have to introduce interface element at the connection nodal point even you can simulate by using truss element with connector as interface element..all the best in your research..