Soil Behavior: Dynamic Soil-Structure Interactions - Dynamic Behavior of Concrete and Seismic Engineering - page 133

Cyclic
degradation for
saturated soils

Behavior
linearity

Elasticity and
plasticity

Analysis
method

Very low 0 dJdJ s Practically

linear

Practically
elastic

Non-degradable Linear

Low J s dJdJ v Non-linear Weakly

Elasto-plastic

Practically non-
degradable

Linear
equivalent

Average
to large

J v dJ Non-linear Elasto-plastic Degradable Non-linear

Table 4.2. Behavior field for cyclic stresses

The appearance thresholds for these non-linearities, respectively named J s and J v ,
depend on the nature of the material, which is roughly characterized by its plasticity
index IP.

Table 4.2 and Figure 4.5 allow us to characterize each of the behavior fields as
well as the analysis methods used to express their behavior in digital studies.

Figure 4.5. Shear cyclic strain

The stresses generated by major earthquakes expected in the French context
could induce strains causing significant linearity losses, or even irreversible strains
in the highest cases (where JtJ s or J v ).