Calculation of the natural oscillation frequency of the submerged basement subject to pulsed loading

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Abstract

The aim of work. To determine the dynamic stiffness at considering vertical and horizontal vibrations of embedded foundations on a conventional and pile base, the possibility of using formulas obtained within the framework of the wave model and SP 26.13330.2012 is considered. Solution technique. Depending on deepening changes, the natural-vibration frequencies of the system oscillations are calculated. The obtained results are compared with the experimental data obtained in a series of impulse dynamic loads performed on foundation models in semi-real conditions. The values of the transverse wave velocities were determined directly on the experimental range from the results of measurements. Results. It is determined that deepening leads to an increase in the frequencies of natural oscillations, both pile foundations and shallow foundations. Full penetration helps to increase natural-vibration frequencies. For horizontal oscillations more than 1.6 times, for vertical oscillations up to 1.4 times. The influence of deepening on shallow foundations is more significant. The advantage of the calculations results and their high agreement with the values obtained during the experiments in the framework of the wave model in comparison with the method from SP 26.13330.2012 is shown. It allows to reliably determining the amplitude-frequency characteristics of the foundations. The results determined in accordance with SP 26.13330.2012, have significantly lower values of the natural-vibration frequencies and do not fully take into account the influence of deepening. The maximum difference with the experimental data for vertical vibrations for a foundation on piles and for a shallow foundation is 33 %. In case of horizontal fluctuations, the maximum differences are from 20 % for a shallow foundation and up to 27 % for a pile foundation.

About the authors

Aleksei O Kolesnikov

Novosibirsk State University of Architecture and Civil Engineering

Author for correspondence.
Email: ao_kolesnikov@mail.ru

Cand. Sci. (Eng.), Associate Professor, Department of Engineering Geology, bases and foundations

113 Leningradskaya St., Novosibirsk, 630008, Russian Federation

Vladimir N Popov

Khristianovich Institute of Theoretical and Applied Mechanics, SB RAS

Email: popov@itam.nsc.ru

Dr Sci. (Phys.-Math.), Chief Researcher, Khristianovich Institute of Theoretical and Applied Mechanics Siberian Branch of the Russian Academy of Sciences

4/1 Institutskaya St., Novosibirsk, 630090, Russian Federation

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Copyright (c) 2018 Kolesnikov A.O., Popov V.N.

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