Question: Slow in plotting invfourier transformed function


I am currently working on structural dynamics problem where I'am trying to obtain the dynamic response of a high-rise building.

To do so I am working in the frequency domain where I was able to find my solution and now I want to obtain the solution in the real time domain by using the inverse fourier function. 

Now the problem comes when applying the inverse fourier transform. The expression which I am trying to tarnsform is extremely long and so Maple requires a lot of time. I tried to run it but after half a day it would still be evaluating. Would there be a way to speed up this process? I attached the worksheet if you're interested.

Thanks in advance :)

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