ANALYSIS OF SOIL FACTOR S USING STRONG GROUND MOTIONS FROM VRANCEA SUBCRUSTAL SEISMIC SOURCE

摘要

A strong-ground motion database of more than 400 records from 9 intermediate-depth earthquakes with moment magnitudes M_W＞5.0 was assembled and compiled for the BIGSEES national research project. These strong ground motions are used to compute the values of the soil amplification factor which is a key parameter in the definition of the elastic response spectrum defined in Eurocode 8 (EN 1998-1). The strong ground motions are divided both in accordance with the soil category of the recording stations and with the control period T_C, as well. The study of the acceleration response spectra as a function of magnitude, soil class and control period allows for the quantification of the amplification factors. Finally, the results obtained are compared with the design values from Eurocode 8 (EN 1998-1). This study comes at a time when Romania is harmonizing the national codes with the European design codes.