How to create a internal hinge in a beam element

Hi everyone, I'm opening this topic for asking how i can create a simply internal hinge on a beam element. 

I tried to create a simple beam embedded at the ends. 
If I insert an internal hinge at the ends I should find the behavior of a simply supported beam. 

I would like to understand how it works before applying it to a much more complex case.

Thanks

Emanuele