Prise en compte de la coïncidence de fréquences sol-structure dans les évaluations de vulnérabilité et de risque sismiques se basant sur l'approche neuronale.

It has been observed repeatedly in the post-seismic investigations that structures having frequencies similar to that of soil foundation exhibited significantly greater damage (Caracas 1967, Mexico 1985, Pujili 1996, L'Aquila 2009). However this observation is generally not taken directly into account neither in present-day seismic regulations (small scale), nor in large-scale seismic risk analysis. We considered a theoretical analysis to study the effect of coincidence between soil and building frequencies. As a first step, 887 realistic soil profiles having a linear behavior are associated with a set of elastoplastic oscillators of 1 degree of freedom. The results obtained to date are used to quantify the damage increment related to the coincidence of frequencies depending on other parameters such as the peak ground acceleration (PGA), the ground (impedance contrast) and the structure (ductility) based on neural network approach that does not require any a priori knowledge.