Problems of Engineering Seismology: article

Effect of the uppermost part of the soil profile on the site response
A. Kalinina
S. Ammosov
V. Bykova
R. Tatevossian
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Journal: Problems of Engineering Seismology
Tome: 44
Number: 4
Year: 2017
Pages: 77-92
UDK: 550.34
DOI: 10.21455/VIS2017.4-5
Keywords: response spectrum, degradation curves, equivalent linear modeling, seismogeological model of soil, PGA
Аnnotation: Effect of the uppermost part of the soil profile on the seismic excitations is analyzed. Six soil profiles are considered. Linear equivalent modeling is applied to calculate the site response. Peak ground acceleration of the input signal to the soil profile varies from 0.1 to 0.6 g . It is shown that the dependence of soil physical-mechanical properties on the deformation lead to variations in spectral amplitudes of the response spectra on free-field. Increase in the thickness of the uppermost layer significantly influences the response spectra shape. The PGA , damping coefficient, deformation, and shear-wave velocity distribution with depth are calculated tacking into account degradation curves. It is demonstrated that limiting the damping coefficient by 15 % very slightly affects the resulting free-field spectra. Soil profile decreases the input signal ( PGA ) when it exceeds 0.3 g .