Floor moment of inertia

[Alana]

hello,

How can I vary the floor moment of inertia (Io) in opensees?

[fmk]

change the properties of your model!

[Alana]

Hi,

Thank you for the reply.
Is changing the values of Rz in mass command the correct way?

mass 1001 0.49208 0.49208 0.49208 0 0 2657232000
mass 2001 0.45783 0.45783 0.45783 0 0 2472282000
mass 3001 0.45091 0.45091 0.45091 0 0 2434914000
mass 4001 0.45091 0.45091 0.45091 0 0 2434914000

I want to increase the moment of inertia of the floor so that the rotation is predominant in the 1st mode.