In Sacramento, CA, United states, 2008. Displacement function;Dynamic soil-structure interaction;FLAC;Impedance functions;Oscillating frequencies;Shear wave velocity;Strip footing;Two-layer;

Paper abstract bibtex

Paper abstract bibtex

The risk associated with structures subjected to dynamic loading needs a rigorous analysis that takes into account dynamic soil-structure interaction. A key step of this analysis consists of estimating the dynamic response of the foundations by calculating their impedance (i.e. dynamic stiffness K and damping C) or displacement functions (real part F1 and imaginary part F2). The purpose of this work is to evaluate the displacement functions (inverse of impedance functions) of strip footings on the surface of some homogeneous soil. Validation studies indicate the accuracy and versatility of the models performed with the software FLAC (Fast Lagrangian Analysis of Continua). It is known that the assumption of homogenous layer or half space with constant shear modulus G may not be realistic as the shear wave velocity increases as a function of the effective overburden stress. In this paper, three soil models are considered. For each case, the adopted mechanical characteristics correspond to a type of soil with constant or variable shear wave velocity. Calculations are performed over a practically sufficient range of oscillating frequency ratios a0. Comparison of results obtained with varying and constant shear wave velocity shows the importance to consider this velocity increasing with depth. Additional calculations conducted on two-layer soil are also presented in order to recommend the thickness of soil that is required in the model to capture soil-structure interaction. © 2008 ASCE.

@inproceedings{20092412123909 , language = {English}, copyright = {Compilation and indexing terms, Copyright 2023 Elsevier Inc.}, copyright = {Compendex}, title = {Numerical simulation of displacement functions of strip footings}, journal = {Geotechnical Special Publication}, author = {Jendoubi, Abir and Legeron, Frederic and Karray, Mourad}, number = {181}, year = {2008}, issn = {08950563}, address = {Sacramento, CA, United states}, abstract = {The risk associated with structures subjected to dynamic loading needs a rigorous analysis that takes into account dynamic soil-structure interaction. A key step of this analysis consists of estimating the dynamic response of the foundations by calculating their impedance (i.e. dynamic stiffness K and damping C) or displacement functions (real part F1 and imaginary part F2). The purpose of this work is to evaluate the displacement functions (inverse of impedance functions) of strip footings on the surface of some homogeneous soil. Validation studies indicate the accuracy and versatility of the models performed with the software FLAC (Fast Lagrangian Analysis of Continua). It is known that the assumption of homogenous layer or half space with constant shear modulus G may not be realistic as the shear wave velocity increases as a function of the effective overburden stress. In this paper, three soil models are considered. For each case, the adopted mechanical characteristics correspond to a type of soil with constant or variable shear wave velocity. Calculations are performed over a practically sufficient range of oscillating frequency ratios a0. Comparison of results obtained with varying and constant shear wave velocity shows the importance to consider this velocity increasing with depth. Additional calculations conducted on two-layer soil are also presented in order to recommend the thickness of soil that is required in the model to capture soil-structure interaction. © 2008 ASCE.<br/>}, key = {Soils}, keywords = {Geometry;Earthquake engineering;Geophysics;Numerical models;Dynamic loads;Risk assessment;Shear waves;Soil structure interactions;Shear flow;Engineering geology;Wave propagation;Acoustic wave velocity;}, note = {Displacement function;Dynamic soil-structure interaction;FLAC;Impedance functions;Oscillating frequencies;Shear wave velocity;Strip footing;Two-layer;}, URL = {http://dx.doi.org/10.1061/40975(318)136}, }

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