Study of the dynamic behavior of buildings with non-linear deformations of the foundation and soil base

Authors

  • Владимир Александрович Сахаров Kyiv National University Construction and Architecture 31, Povitroflotskiy avenue, Kyiv, Ukraine, 03680, Ukraine https://orcid.org/0000-0002-9381-3283

DOI:

https://doi.org/10.15587/1729-4061.2015.40026

Keywords:

numerical simulation, nonlinear deformation, direct integration in time, spectral superelement

Abstract

The present level of the design of multi-storey structures in seismically dangerous conditions is virtually impossible without performing numerical studies. In the simulation of the dynamic interaction of buildings and constructions with the soil base, one of the most problematic issues is the accounting of oscillation damping processes in soils and structures. Energy losses in these environments are different in nature, character and significantly differ in values. Using viscoelastic models with different damping parameters for different environments allows to solve these problems only partially. While ignoring the nonlinear properties of soils, estimating the residual sludge and tilt of structures is impossible. Plastic deformations of soils, as well as the accumulation of local structural damage significantly affect the interaction of the elements of the "foundation - soil base - building" system as a whole.

The behavior study of the complex of multi-storey buildings (12, 18 and 24 storey) under seismic loads taking into account nonlinear deformation of foundation soils and soil base structures was given in the paper. The simulation was performed on an automated research system «VESNA-DYN» based on the modified explicit central difference method with increment by the spatial coordinates using spectral superelements that ensured high calculation efficiency. The Conclusion. The results have shown that the soil body has a considerable influence on the structural deformations. Soil bases of buildings, which differ in the number of storeys and weight have a similar oscillation frequency. The oscillation amplitude of the altitude section top is smaller (by more than 2 times) than in the other buildings and characterized by the lower (up to 2 times) oscillation period. Due to the nonlinear deformations of foundation soils, the magnitudes of residual tilts of buildings were obtained. The resulting deflection was maximum for a 12-storey building. It should be noted that plastic deformations have reduced the actual stiffness of the piles, which has significantly affected the deformation nature of soil bases. Maximum settling of buildings was about 5 cm.

Author Biography

Владимир Александрович Сахаров, Kyiv National University Construction and Architecture 31, Povitroflotskiy avenue, Kyiv, Ukraine, 03680

Associate professor (docent), PhD

Base and foundation department. 

References

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Published

2015-04-21

How to Cite

Сахаров, В. А. (2015). Study of the dynamic behavior of buildings with non-linear deformations of the foundation and soil base. Eastern-European Journal of Enterprise Technologies, 2(7(74), 4–10. https://doi.org/10.15587/1729-4061.2015.40026

Issue

Vol. 2 No. 7(74) (2015): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2015 Владимир Александрович Сахаров

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