Natalia V. Nikonova
Natalia V. Nikonova

Natalia V. Nikonova
Candidate of Technical Sciences,  St. Petersburg State University of Railways of Emperor Alexander I.  St. Petersburg,  Russian Federation  lovelynataxa@inbox.ru


Publications

SOME FEATURES OF SEISMIC ISOLATION DESIGNING IN THE CONDITION OF LIMITED INFORMATION ABOUT THE SEISMIC IMPACT
Issue:
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The basic design principles of seismic isolation systems in the absence of seismological data for the construction site are considered. This situation occurs in the preliminary stages of design, the design of objects of mass building, as well as in a typical design. To this end, it proposed to use the linearized motion equations and universal temporal processes to modeling accelerograms. The stated procedure is implemented in the design of seismic isolation systems of railway bridges in Sochi.

Taking into account the difference in the support excitation for multi-supported structures
Issue: #6-2021
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Three characteristics are proposed to describe the excitation differences under supports for calculating multi-supported structures. These characteristics include the non-synchronicity indicator t0, the incoherence indicator r and the non-uniformly scaled indicator z. The first characteristic shows the time shift between the excitations, the second characteristic shows the difference in the excitation frequency composition, and the third one shows the difference in the action amplitudes. To estimate the nonsynchrony index, two approaches have been proposed – maximizing the correlation function and minimizing the norm of the excitation difference. The proposed parameters fully characterize the acceleration inhomogeneity field at the construction site. However, they affect the system response in different ways. Small deviations in the index of excitation amplitudes z weakly reduce the structure response. As for the excitation incoherence, this effect can bring the system closer or away from resonance.