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simulation of the resonance of a metal structure ansys 12.1

hello
is it possible to load (or simple harmonic ...) this structure to make it resonates and see the amplified strains.
What are the steps:
- I have already started extracting the natural frequencies (modal analysis I took 6 modes).
- I still have to apply a harmonic load F (t) = f 0 cos (alpha * t), I can not make this charge (I froze here)
- Instead it will force following the direction of the first response of the structure (the first nature-value) in the direction of the distortion along the + y axis (blue arrow)
Have you any solutions or examples to provide me

thank you answer me
P.S ansys12.1(workbench

http://img227.imageshack.us/i/structure01.jpg/

http://img191.imageshack.us/i/structurem.jpg/

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