Preliminary Spectral Matching Analysis of the Rod El-Farag Region in Cairo, Egypt
Résumé
Earthquake engineering assessments are essential for evaluating the seismic response of structures. Nonlinear dynamic analysis is a highly effective method for evaluating seismic response, considering the complex, three-dimensional, and dynamic behaviour of structures during earthquakes. The complexity of seismic damage assessment arises from ground motion and structural modelling parameters. Spectral matching is a key method in seismic codes and aids in selecting earthquake accelerograms for performance- and force-based designs. Spectrum-matched data is increasingly used to estimate nonlinear structural responses. Spec-tral matching utilizes the wavelet adjustments introduced by Abrahamson (1992) and refined by Hancock et al. (2006) to adjust earth-quake accelerograms to match a specified response spectrum, enhancing the precision of seismic evaluations. This paper presents a preliminary spectral matching analysis of selected natural earth-quake accelerograms using SeismoMatch. The results show that SeismoMatch effectively matches the time history response spectra with the target spectrum, nearly achieving perfect alignment. The Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), and Peak Ground Displacement (PGD)values obtained from spectral matching exhibited significant deviations from the original values, highlighting the impact of accelerograms amplitude scaling. Among the accelerograms analysed, the ground motion selected using SeismoMatch with the Al Atik & Abrahamson (2010) algorithm produced the closest match to the target spectra compared to the other selected accelerograms.
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