How can we obtain ''user-defined hinge properties'' i.e moment-rotation curve for column (P-M-M hinges) and beam (M- hinges) for a section of concrete beam and column?
The bending moment (M) acting on the connection is calculated by multiplying the “Load” by the distance "L" between the load application point and the face of the endplate, Lload: M =Load ×L .
The rotational deformation of the connection (Φ ) is the sum of the shear deformation of the column web panel zone (SDpanel-zone) and the connection rotational deformation, (RDconnection). Connection rotation is defined as the change in angle between the centerline of beam and column (θbeam ,θcolumn) : RDconnection = θbeam -θcolumn.
Use Etabs Section Desinger (mini soft inside Etabs - generally used for shear walls desgin) and you will get moment- curvature of a geometry you build with the required reinforcement. Than by using different literature (ATC 40 or FEMA 356) you can generalize the data and make it usable to create the plastic hinge parameters. Remember that CsI software make this process automatically just by adding reinforcement to the frame element.
From section designer tool (SAP 2000 or ETABS) you can obtain moment curvature curve. After that, calculate plastic hinge length from the following equations and multiply with curvature data. Then, you can obtain moment-rotation relationship.
You can obtain hinge proprieties from the moment-curvature curve section in SAP2000 using Caltrans idealized model. and you can calculate the equivalent plastic hinge lengths using Priestley hypothesis.