Generation of Design Spectra Derived From Real Seismic Records

Abstract

The assessment of seismic action is an essential step in the design of building. this study aimed to establish of seismic design spectra adapted to local conditions in Morocco, based on actual recordings of the 2023 Al Haouz earthquake and the Moroccan seismic code RPS 2011. The approach adopted is based on the analysis of the history of recorded seismic accelerations, followed by the calculation of elastic response spectra at 5% damping. The reference spectrum is first established for the rocky site (class S1), characterized by an average shear wave velocity $V_{S 30}\gt760 \mathrm{~m} / \mathrm{s}$.” Site effects are then taken into account through the amplification coefficients defined by RPS2011, allowing the design spectra corresponding to class $S 2$ and $S 3$ sites to be deduced. In order to ensure consistency between the time signals and the target spectra, a spectral matching procedure in the time domain is applied, leading to the generation of artificial accelerograms compatible with the design spectra for the three site classes.