EVALUATION OF THE SYNTHETIC ACCELEROGRAMS DEFINED IN THE MEXICO CITY TECHNICAL DESIGN STANDARDS FOR SEISMIC DESIGN
DOI:
https://doi.org/10.18867/ris.115.696Keywords:
acelerograma, espectro de peligro uniforme, duración del movimiento fuerte del suelo, NTC, análisis de peligro sísmico, periodo de retorno, periodo del sueloAbstract
An analysis of the accelerograms defined in the Mexico City Technical Design Standards (NTC) is presented. The study is based on probabilistic seismic hazard analysis, hazard-consistent ground-motion simulation, and comparison with the accelerograms provided in NTC-2023. The results indicate that these accelerograms do not meet the intensity demands associated with ground-motion duration, leading to biased estimates of the inelastic structural response. Displacement and hysteretic energy response spectra are presented for three sites in Mexico City, analyzing single-degree-of-freedom systems modeled with a bilinear constitutive law. In addition, the temporal evolution of the characteristic site period is analyzed using exponential models, highlighting its influence on the expected duration of strong ground motion and its impact on duration-based hazard curves. It is recommended that the models used to estimate the ground-motion parameters involved in the characterization of the NTC accelerograms be continuously updated.
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