I am modelling a single concrete pile with the reinforcement, my pile material is concrete and my reinforcement material is embeeded beam. I put my embeeded beam in the concrete pile just like the real reinforcement. Is it valid?

Structural elements such as plates or embedded beams can be used to model reinforcement. For example, embedded beams offer the opportunity to include different reinforcement bars and allows bond-slip modelling between concrete and rebar.

Usually, the structural design will yield the total area of reinforcement (As) for the longitudinal reinforcement, which can be used as an input. Therefore, it is possible to give the characteristics of the whole (detailed) reinforcement. 

For concrete you can use the Concrete UDSM. You can find some additional information on the use of the concrete model and its reinforcement in the link below:

•  communities.bentley.com/.../on-the-use-of-the-shotcrete-udsm-for-modelling-concrete
  

Okay, and for the spiral reinforcement, can i define the nurbs curve as a beam? Because there is just beam that available or i cant modelling the spiral reinforcement? 

Beams can be created from a NURBS line but embedded beams cannot be assigned to a NURBS line. 

Thank you sir