This module contains the Python functions required to generate strong motion duration dependent target PSD functions compatible with a design/target response spectrum.
example: https://youtu.be/3SYEzu2sI_U
cite the article: Montejo, L.A. Strong-Motion-Duration-Dependent Power Spectral Density Functions Compatible with Design Response Spectra. Geotechnics 2024, 4, 1048-1064. https://doi.org/10.3390/geotechnics4040053
cite the code:
Montejo L.A.; Vidot-Vega, A.L. 2017. “An Empirical Relationship between Fourier and Response Spectra Using Spectrum-Compatible Times Series” Earthquake Spectra; 33 (1): 179–199. doi: https://doi.org/10.1193/060316eqs089m
Chi-Miranda M.; Montejo, L.A. 2018. “FAS-Compatible Synthetic Signals for Equivalent-Linear Site Response Analyses” Earthquake Spectra; 34 (1): 377–396. doi: https://doi.org/10.1193/102116EQS177M
The functions included can also be used to compute SD5-75, record PSD (as specified in NRC SRP 3.7.1) and record response spectra (using frequency domain operations).
The following is a list of the functions included in the module:
*DDTargetPSD: Generates a strong motion duration dependent target PSD compatible with target response spectrum
*DDTargetPSD_MP: Same as DDTargetPSD, but a more efficient version using multiple processes (concurrent.features)
*PSDFFTEq: Calculates the power spectral density of earthquake acceleration time-series, FFT is normalized by dt, FFT/PSD is calculated over the strong motion duration returns the one-sided PSD and a "smoothed" version by taking the average over a frequency window width of user defined % of the subject frequency.
*FASPSAratio: Target FAS based on empirical relationship between Fourier and response spectra (Montejo & Vidot-Vega, 2017)
*SignificantDuration: Estimates significant duration and Arias Intensity
*RSFD: Response spectra (operations in the frequency domain)
*log_interp: Performs logarithmic interpolation
*saragoni_hart_w: returns a Saragoni-Hart type of window