Abstract
This article presents the results of a study on the random variability influence of soil deformation parameters - elastic modulus, Poisson’s ratio - on the dynamic characteristics of a building. The spatial finite element system “building - pile foundation” is considered, taking into account the reduction in the acceleration of ground vibrations with depth. The probabilistic calculation of the system is carried out by the Monte Carlo method, the random parameters of the subgrade are taken to be distributed according to the normal law. Statistical characteristics of free frequencies of system vibrations were obtained, it was found that within the same soil type, it is possible to realize system vibrations with a predominance of both the 1st and 2nd forms.
Highlights
IntroductionPile foundations are one of the most common types of foundations. The variety of the piles types allows them to be used everywhere, on almost any basis and in various climatic conditions
Today, pile foundations are one of the most common types of foundations
The quasi-static model adopted in this work is rather arbitrary, but it allows a qualitative assessment of the "building-pile foundation" system dynamic characteristics variability depending on the deformation properties of the foundation soils
Summary
Pile foundations are one of the most common types of foundations. The variety of the piles types allows them to be used everywhere, on almost any basis and in various climatic conditions. 20% of the territory where the objects of increased danger are, is located in the zones with magnitude seismicity of 9 or more These data make the issues of studying the building operation under the seismic loads influence one of the most urgent and acute ones today. This issue is discussed in detail in the works [2, 3, 4]. In all of the above studies, the compliance of the subgrade is taken into account using a system of springs and dampers that simulate the horizontal, vertical and angular displacements of a surface foundation In this case, a flat model of the "structure-base" system is considered. The calculations took into account the recommendations and experience of other authors [1, 11, 12] involved in related research
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