Soil Structure Interaction in Nonlinear Soil

Gicev, Vlado (2009) Soil Structure Interaction in Nonlinear Soil. In: Coupled site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation. Springer.

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A two-dimensional (2-D) model of a building supported by a semi-circular flexible
foundation embedded in nonlinear soil is analyzed. The building, the foundation, and the soil
have different physical properties. The model is excited by a half-sine SH wave pulse, which
travels toward the foundation. The results show that the spatial distribution of permanent,
nonlinear strain in the soil depends upon the incident angle, the amplitude, and the duration
of the pulse. If the wave has a large amplitude and a short duration, a nonlinear zone in
the soil appears immediately after the reflection from the half-space and is located close to
the free surface. This results from interference of the reflected pulse from the free surface
and the incoming part of the pulse that still has not reached the free surface. When the wave
reaches the foundation, it is divided on two parts—the first part is reflected, and the second part
enters the foundation. Further, there is separation of this second part at the foundation-building
contact. One part is reflected back, and one part enters the building. After each contact of the
part of the wave that enters the building with the foundation-building contact, one part of the
wave energy is released back into the soil. This process continues until all of the energy in
the building is released back into the soil. The work needed for the development of nonlinear
strains spends part of the input wave energy, and thus a smaller amount of energy is available
for exciting the building.

Item Type: Book Section
Subjects: Natural sciences > Earth and related environmental sciences
Natural sciences > Matematics
Natural sciences > Physical sciences
Divisions: Faculty of Computer Science
Depositing User: Vlado Gicev
Date Deposited: 06 Nov 2012 13:54
Last Modified: 15 Aug 2013 10:51

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