NEW INSIGHT IN THE DERIVATION OF AMPLIFICATION FACTOR BY TAKING INTO ACCOUNT SOIL PARAMETERS

D. Zendagui (1) , A. Stambouli Boudghene (1) , P.-Y. Bard (2) , B Derras (1, 2)

1 RISAM - RISk Assesment and Management
2 ISTerre - Institut des Sciences de la Terre

It is currently admitted that the amplification factor (AF) is one of the best tools to describe site effects. AF depends on soil parameters that are derived from the geometrical and mechanical soil properties of the soil profile. Thus, it is important to identify which soil parameters shape the form of the AF. The aim of this paper is to measure the effects of various site parameters on the variation of AF. As the problem is highly complex, a tool using the GRNN (Generalized Regression Neural Network) to understand which soil parameters have been developed. For a particular soil profile it has been found that values of AF derived from GRNN approach are closer to that of 1D linear viscoelastic seismic analysis particularly if the number of parameters increases. Based on this result a sensitivity analysis has been conducted to identify which parameters give good AF. For the practical case where we have to introduce only two parameters, it has been observed that the couple [resonance frequency (f 0) , time-averaged shear-wave velocity in the top 30 m (Vs30)] is the most interesting.

Mots clés: amplification factor; site effects; soil parameters

Domaines: Géophysique [physics.geo-ph]

D. Zendagui, A. Stambouli Boudghene, P.-Y. Bard, B Derras. NEW INSIGHT IN THE DERIVATION OF AMPLIFICATION FACTOR BY TAKING INTO ACCOUNT SOIL PARAMETERS. Sixteenth World Conference on Earthquake Engineeringn, Jan 2017, Santiago, Chile. pp.3821. ⟨hal-01461207⟩