CalcFRF

Calculate frequency response function of a homogeneous soil profile

This function calculates the frequency response functions for three cases of soil profiles:
1) for uniform undamped soil layer over rigid bedrock
2) for uniform damped soil layer over rigid bedrock
3) for uniform damped soil layer over elastic bedrock
Input to the function is:
H : thickness of the soil layer (in m) [H]
rho : mass density of the soil and the bedrock (in kg/m3) [rho_soil rho_rock]
Vs : shear wave velocity of the soil and bedrock (in m/s) [Vs_soil Vs_rock]
ksi : hysteretic material damping of the soil and the bedrock [ksi_soil ksi_rock]
Fs : sampling frequency for the analysis
NFFT: Number of frequencies for the FFT