SEISMIC SOIL-STRUCTURE INTERACTION IN THE TIME DOMAIN

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SEISMIC SOIL-STRUCTURE INTERACTION IN THE TIME DOMAIN

Author: Zhang Jian Jing | Size: 8.7 MB | Format: PDF | Quality: Unspecified | Publisher: DEPARTMENT OF CIVIL ENGINEERING UNIVERSITY OF CANTERBURY CHRISTCHURCH, NEW ZEALAND | Year: 2000 | pages: 245

A time domain analysis procedure and method for seismic soil-structure interaction
analysis are introduced in this work. This includes the selection of the soil model, the
far field model, the structural model and the soil-structure interaction analysis
method.
The bounding surface plasticity model is implemented to model the near field. The
boundary element method in the time domain is used as the far field model. A
coupling method between the boundary elements and finite elements has been
proposed, its main advantages being: equilibrium and compatibility conditions are
used directly and the present boundary element and finite element packages only need
a small modification before they are used in this coupled procedure.
Nonlinear local site analyses have been carried out. The comparisons of the effects of
strong and weak input motions, different soft clay sites and different input motions on
local site amplification show the effect of soil yielding on local site response.
A primary investigation of the effect of soil-structure interaction on structural
response is carried out using the linear and nonlinear soil models. When the linear
elastic model is used to represent the soil behaviour, the effects of different sites,
frames and input motions from the basement rock on the soil-structure interaction are
investigated. The results show that the natural vibration periods of the site and
structure can represent the effect of the site and structure on the soil-structure
interaction and the predominant period of the input motion can represent the effect of
the input motion on soil-structure interaction. Acceleration response at the foundation,
displacement at the top floor, inter-storey shear force and the rocking of the
foundation are used to show the effect of the natural periods on the soil-structure
interaction. When the nonlinear soil model is used to represent the soil behaviour, a
comparison of the results of the linear and nonlinear analyses shows that the soil
yielding has a great influence on vibration frequency and vibration amplitude of both
the acceleration and the displacement at the foundation and at the top floor of the
structures. The permanent settlement of the foundation shows its accumulative
characteristics.

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