Prokopovich S.V.
Prokopovich S.V.

Prokopovich S.V.
PhD student, Emperor Alexander I St.Petersburg State University of Railway Engineering; LLC "UK" Modern Bridge Technologies», engineer


Publications


Issue: №4 2018
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Issue: №3 2018
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Absolute Сumulative Velocity as a Measurement of Earthquake Strength
Issue: №5 2019
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In this paper the aspects of determination of energy characteristics of seismic input are studied. The range of various energy characteristics is estimated. The index of range of statistical data shows that using cumulative absolute velocity is preferable to using Arias intensity. The parameters of distribution of absolute cumulative velocity values are described. Each mark on the Richter scale corresponds to one constant velocity value.

Statistical Modeling of the Earthquake Input
Issue: №5 2019
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The main problem of modeling statistical seismic vibrations is correct input accelerogram setting. The analysis of the known seismic input models showed the erroneousness of using them in analyzing seismically isolated systems. These statistical models allow one to obtain either reliable accelerations or reliable displacements. However, complicated input models do not quite correspond to real earthquakes. Energy characteristics were not considered at all in the problems of accelerogram statistical modeling. A new model of seismic input, including a random pulse, has been considered. Three parameters has been added to the input model: the magnitude Мw , the epicentral distance R, and the moment when the pulse appears. Varying these parameters within the set limits allows one to adjust additional input characteristics. An example of the proposed process is given.

Some Features of Modeling Design Accelerograms
Issue: №1 2019
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Summary:  At present, calculation of structures using earthquake accelerograms is becoming more and more important. However, the problem of modeling design accelerograms causes debates and contains various suggestions based on contradictory assumptions. Therefore, the value of complicated and time-consuming dynamic calculations can be rather dubious. The paper deals with some parameters of modeling design accelerograms. It is shown that the widely used method of input generation, developed by A.A. Dolgaya, gives rather rough approximations of synthetic accelerograms to real 
ones due to the insufficient number of model parameters.

The Refinement of the Model of Seismic Input for the Statistical Modeling of Structures

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The paper describes a statistical method taking into account the velocity pulse and the energy characteristics of the reference impact. An example of generation of an impact is also given, which includes the impulse component.

Estimating the dependence of seismic input energy characteristics on its predominant period

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The paper considers the types of dependencies of the seismic input energy characteristics on input prevailing period. In particular, the types of dependencies for the Arias intensity and the seismic energy density are proposed. In the course of this study, a database including 91 accelerograms of earthquakes with intencity 9 on the MSK scale was used. This database was collected at the Petersburg State Transport University and the University of Petroleum in Qingdao. Parameters of the approximating dependences were calculated by the least squares method. Formal dependencies in the form of polynomials and exponential functions, and dependencies, characteristic for the input in the form of a damped sinusoid were considered. Parameters of the last type of dependencies can have a physical meaning. Studies have shown that some of the input parameters (peak accelerations and velocities, harmonic coefficient) have a clear correlation with the accelerogram prevailing period, and for energy characteristics such relationship is not observed.