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the purpose is to calculate the change in modulus of elasticity

No, there is two modes (two story building) and there is a damping (R.C model), so i can't calculate it directly .

building is concrete moment frame and symmetric .The model structure was displaced (pulled back) by 2mm at the second floor level using a steel wire. The wire was then suddenly released and the structure was allowed to vibrate freely. Acceleration and displacements were measured at each floor...

its a reinforced concrete model (no special details) i want to know the methodology of calculating stiffness for this building

i have a real building model (two story) and i do a free vibration test for the building (floors acceleration had been measured)then i get the frequency for the first and second mode. what shall i do to calculate stiffness of the building?