In SP14.13330 they use the «dangerous excitation direction» concept, looking for a certain direction of the one-component excitation vector in space, providing maximal modal response for each mode. In the international practice they use another approach, considering three-component excitation for each mode. «One-component onemode» responses are combined twice: first for different modes within each excitation component, then between different excitation components. It was shown that the results of both approaches will be similar, only if all three excitation components have similar response spectra; and all modes have frequencies apart from each other. In this paper the sample axisymmetrical system with double natural frequencies is studied: the «dangerous excitation direction» approach leads to the erroneous result
An analysis of changes movements of structures located in the zone of seismic impact, depending on changes in the thickness of the layer of particular soil, is presented. An 18-storey building was used as the calculation model. The calculation was performed in the SCAD software package. The graphical and mathematical dependences of changes movement of the building on the thickness of soil base layer are determined. The authors believe that the obtained results can be used in designing of high-rise structures.
Comment of the editorial board to the article Kolosov E. S., Kolosova N. B. Dependence of the movement of building elements on the power of the soil in the conditions of seismic impact
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Key words: seismic impact, ground power, static loading, ground foundation, movement of building elements
The authors have done a lot of work to assess the influence of the base layering on the movement of a high structure. However, the use of these results has a number of limitations, which are discussed in the article.
The article deals with the monitoring of individual seismic risk as a criterion value necessary for assessing the degree of risk in case of threats of catastrophic earthquakes at different stages of its manifestation to support decision-making.
The general problem of decision-making under conditions of risk caused by rare unfavorable natural or man-made eventы is considered. An event is specified by the probability of its occurrence or its recurrence and the distribution density function of damages caused by the event, provided that it happened. The problem of limiting the risk probability for a group of objects is considered. The influence of the riskiness of the decision maker on the risk value is shown. Two tasks are considered: the risk of gathering people during a pandemic and the risk of insuring a group of building projects against an earthquake.
Studies of the calculated values of the weight of the snow cover and the values of the altitude coefficient on the slopes of Mount Elbrus
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Key words: weight of snow cover, maximum water content, designed facility, snow load, observation series, meteorological station, snow accumulation, calculated dependence, coefficient of determination
The results of determining the normative value of the weight of the snow cover and its change with height for the projected objects of the VTRK «Elbrus» at altitudes from 2000 m to 3840,6 m are presented. The series of the annual maximums of the water reserve in the snow cover, obtained as a result of snow route observations on the territory of the VTRK «Elbrus», based on the data of snow accumulation monitoring, a regression linear model of the dependence of the water content in the snow cover on the height above sea level was built. The main calculation method for finding the coefficients of a linear equation is the least squares method. The calculated values of the weight of the snow cover per 1 m2 of the land surface of various supply have been obtained. Its value at an altitude of 3500 m above sea level is 10,42 kPa at 2 % availability and 11,16 kPa at 1 % availability
IX International Scientific Conference «Problems and Methods of computer modeling of structures and structures» («Zolotov Readings»)
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(August 25-26, 2021, Moscow)
OUR MEMORY
In memory of Rogozhin Evgeny Alexandrovich
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In memory of Lazareva Irina Vladimirovna
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In memory of Tyapin Alexander Georgievich
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