Question: earthquake hitting skysrcaper simulation


I try to solve the folowing task:

Simulate the behaviour of a skyscraper with eight floors during an earthquake. (assumption: cosinus stimulation). Determine the resonance frequency of the skyscraper. When does it collapse. Ignore damping.

I tried a lot and I become really desprate because I can not solve the task. Please help. This is what I calculated with maple until now (see file). View on MapleNet or Download
View file details

Maybe you have an idea how I can continue to get the resconance spectrum and so on.

I am looking forward to read all of your ideas and advices to improve my solution.

Thank you in advance.

P.S.: I use maple12





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