DOI: https://doi.org/10.32515/2664-262X.2024.9(40).2.49-59

Analysis of trends in long-term changes in climatic loads

Vadym Hordeiev, Oleksandr Kordun, Victor Pashynskyi, Mykola Pashynskyi

About the Authors

Vadym Hordeiev, Professor, Doctor in Technics (Doctor of Technic Sciences), LLC "V.M. Shymanovsky Ukrainian Institute of Steel Structures", Kyiv, Ukraine

Oleksandr Kordun, engineer, LLC "V.M. Shymanovsky Ukrainian Institute of Steel Structures", Kyiv, Ukraine, e-mail: kordunoleksandr@gmail.com, ORCID ID: 0009-0009-9683-933X

Victor Pashynskyi, Professor, Doctor in Technics (Doctor of Technic Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: pva.kntu@gmail.com, ORCID ID: 0000-0002-5474-6399

Mykola Pashynskyi, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, ORCID ID: 0000-0002-2669-523X

Abstract

The purpose of the work is to identify changes in the characteristic values of loads from snow and wind over the past decades, as well as to justify the need to take these changes into account when developing load standards for buildings and structures. Characteristic values of wind pressure are determined by the probabilistic model of a random process. The necessary parameters of the Weibull distribution for 13 weather stations of Ukraine are determined by the histograms of the distribution of the results of wind speed measurements obtained in three different periods of meteorological observations during the years 1961...2020. The characteristic values of the snow load are determined by the probabilistic model of the sequence of annual maxima with the Gumbel distribution. For this purpose, the average values and standards of the annual maximum snow cover weight at 54 weather stations, obtained from the results of snow measurement surveys in three different observation periods during 1950...2020, were used. According to the data of each weather station, the rates of characteristic values of loads change over time are determined. Characteristic values of wind pressure at 11 weather stations out of 13 that were considered decrease by an average of 4.5 Pa/year. For two weather stations, the intensity of the decrease is much greater and equals to 13.4 Pa/year and 25.6 Pa/year. At 41 weather stations out of 54 studied, a decrease in the characteristic values of snow cover weight is observed, and at 13 weather stations, the snow load increases over time. Annual increases in the characteristic values of the weight of the snow cover vary within the range of -22...+25 Pa/year with an average decrease of 4.5 Pa/year. As a result of the study, it was found that the significant spread of the rates of change of the characteristic values of loads over time at different weather stations does not allow to generalize this indicator on the territory of Ukraine. In the presence of several groups of data, it is recommended to determine the characteristic values of wind and snow load through the statistical characteristics of wind speed and weight of snow cover, averaged over the data of all available periods of meteorological observations, without taking into account the detected changes in time.

Keywords

climate loads, characteristic values, changes over time

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Copyright (c) 2024 Vadym Hordeiev, Oleksandr Kordun, Victor Pashynskyi, Mykola Pashynskyi