Publication Date:
2021-02-23
Description:
The investigation of soil response to dynamic loads is necessary to predict site-specific
seismic hazard. This paper presents the results of cyclic and dynamic laboratory tests carried
out after the 2016–2017 Central Italy Earthquake sequence, within the framework of
the seismic microzonation studies of the most damaged municipalities in the area. The
database consists of 79 samples investigated by means of dynamic resonant column tests,
cyclic torsional shear tests or cyclic direct simple shear tests. Results are firstly analysed in
terms of field and laboratory values of small-strain shear wave velocity, highlighting the
influence of the sample disturbance and of the mean effective consolidation pressure. The
cyclic threshold shear strains as a function of plasticity index are then compared with findings
from the published literature and the outliers are analysed. Subsequently, the dynamic
soil behaviour is investigated with reference to the small-strain damping ratio. Differences
between results from different tests are analysed in the light of the loading frequencies.
Finally, the database is used to develop a predictive model for soil nonlinear curves according
to plasticity index, mean effective confining stress, and loading frequency. The model
represents a useful tool to predict the nonlinear stress–strain behaviour of Central Italy
soils, necessary to perform site-specific ground response analyses.
Description:
Published
Description:
5503–5531
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
