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RMS along-wind acceleration

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Ahmad Alhamad

Structural
Mar 8, 2017
24
Hello,
I have a building with height equal 63m, and i want to calculate RMS along-wind acceleration.However, I have issue in calculation modal mass (m1) and the mode exponent (hepsi).
Thanks for any help.
Capture0000_xgbpka.png
 
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Modal mass for a given mode is equal to the sum(the unity scaled modal shape^2 multiplied by the mass at that location). Sum(f_i^2 x M_i). Max value in modeshape coordinates should be scaled to 1.0. You can get these values from your analysis modal after undertaking a modal/response spectrum analysis usually.

I'm not sure on the second term, not familiar with the term.
 
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