i think you muste be:

1-model your wall

2-define the material response and failure

3-in dynamic load(slow), rise the moment and history record of wall rotation

4-in history,you know draw the mom-rot curve

You can do this using a fiber model or a more detailed FE model. If you're not already, I recommend you review many of the recent papers by Prof Amit Varma and Prof Andrew Whittaker. They have done extensive research in this area. Here are a few recent papers that should help you with your question.

Article In-Plane Seismic Behavior of Rectangular Steel-Plate Composi...

Conference Paper SC wall piers and basemat connections: Numerical investigati...

Conference Paper Rectangular SC Wall Piers: Summary of Seismic Behavior and Design

Article Finite element modeling of steel-plate concrete composite wall piers

dear Phadnis

You can simply do it in OpnSees software. You have to define your wall as fiber section  and with a zero length section you can easily find it. There is a predefined procedure in OpenSees manual to calculate momen-curvature relationship.

I have linked the URL for you.

With kind regards

http://opensees.berkeley.edu/OpenSees/manuals/usermanual/724.htm

1. Model the wall in section designer utility in SAP2000 as mid-pier element.

2. Run gravity analysis.

3. Obtain axial load carried by the wall.

4. In section designer utility, check moment-curvature relation by substituting value of axial load. Obtain values of yield and ultimate moments and curvatures.

5. By using formulae from Eurocode 8, determine yield and ultimate rotations.

Jakob Bruhl Dr. Bruhl if you have an example of fiber model for moment curvature relatioship and if you can share ita that will be very helpful. I am struggling to find an example of fiber model to calculate moment-curvature of reinforced concrete section. I want to automate the responses and thus looking for fiber model.