Nonlinear Properties of Soils (Part I)
Nonlinear Properties of Soils (Part I)

Nonlinear Properties of Soils (Part I)

Authors:  

Zaalishvili V.B.
д-р физ.-мат. наук, проф., (Центр геофизических исследований ВНЦ РАН и РСО-А, г. Владикавказ)


Rubric:     Seismic zoning   
Annotation:

The various aspects of the nonlinear properties of soils that are clearly exerted under strong loadings are considered in the present work. Nonlinear properties being the most important indicator of soils, as a rule, are not sufficiently taken into account during seismic hazard assessment and are limited by so-called geometric nonlinearity that is well described by the corresponding equations.

Behavior of soil stratum under impact of artificial source is reliably described by the hysteresis damping model. By changing duration of exposure it is possible to observe the reaction of corresponding amounts of soil strata, what supposes the need to solve most problems of seismic microzonation (SMZ) experimentally. This, in particular, makes it necessary to carefully analyze and further compare records of real and artificial impacts. Such an approach by analyzing records of Racha earthquake (Georgia, 1991) made it possible to identify and justify the application as new indicators of ground movement – areas of normalized and real spectra of ground motion. Further analysis made it possible to introduce indices of actual absorption and nonlinearity that are also based on their relationships with the spectral characteristics of the ground motion. The corresponding empirical formulas obtained. Selection of the most appropriate indicators of nonlinearity for practical use involves focused investigations.

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