Amplitude of mode shapes

Amplitude of mode shapes

Dear All,

I am a new user of STAAD Pro and interested in the Dynamic Analysis.
From the modal calculation command, we get a frequency, a (mass) participation X-Y-Z % by mode and mode shapes. I have questions as below?

1. Can the STAAD Pro show amplitude of 1st mode, 2nd mode, 3rd mode and other mode in the output?. Or
2. Can we find the amplitude of 1st mode, 2nd mode, 3rd mode and other mode by STAAD Pro?
3. Please help to explain the meaning of a (mass) participation X-Y-Z % ?.

Please help to answer the questions and thank you for your kind consideration.

pvsnak@live.com