Dynamo for Rebar is an Open-Source project available on github and Dynamo’s package manager. It enables iterative, parametric rebar design inside of Dynamo 0.8.2 and Revit 2016. The library contains a set of nodes that help create bars and containers in Revit. It also provides a set of nodes for creating the base curvature of single bars or entire rebar containers. It includes a parametric interface for Revit’s 2016 Rebar API, which allows for the creation of single reinforcing bar elements and rebar container elements in Revit.
Dynamo for Rebar on the web:
Rebar Modelling in Revit with Dynamo Part 1 (revitbeyondbim.com)