Seismosoft | Earthquake Engineering Solutions

The maximum value of the Fourier Spectra Amplitude is 0.45 when the unit of acceleration time history is g. However, the The maximum of the Fourier Spectra Amplitude remains the same value when I changed the unit from g to gal. So I wonder what is the unit and physical meaning of the Fourier Spectra Amplitude?
Regards
WangZhen

The acceleration units play a role in the program with respect to the displacement and the velocity units (e.g. when integrating to derive the displacement & velocity time-histories. However, with quantities of acceleration, the results are expected to be the same.
Regards,
Seismosoft

Thanks for your reply.
So does it mean that if the numbers of the acceleration time history remains the same, the Fourier Amplitude will not change?
Regards
Wang Zhen
2017.09.12

Ye, the Fourier Amplitude will not change.
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