earthquake simulation

Hi,

I am stuck and i really need help to do the earthquake simulation for the current architecture project which i have done the model.

I downloaded the bullet thing and it works but it does not look like an earthquake and the building moving. Its like when i click bake and then the building explodes when the ground shake. I think it got to do with the connections or rigid body.

I tried other thing is i joined them then the ground shake but the building is so stiff eg not fracturing or collasping.

Can you help me how to figure how to make this building not to explode or make it too stiff.

Thank you