CHANGE IN NATURAL OSCILATON FREQUENCIES OF BUILDINGS AND STRUCTURES DEPENDING ON EXTERNAL FACTORS
V.S. Seleznev1, A.V. Liseikin1, I.V. Kokovkin1, V.M. Soloviev2
1Seismological Branch of Geophysical Survey of the Russian Academy of Sciences, Novosibirsk, Russia
2Altai-Sayan Branch of Geophysical Survey of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Seismic monitoring, building monitoring, natural frequencies, remote monitoring, temperature influence, buildings and constructions
Abstract
This work is devoted to the development of the engineering seismic monitoring method created in Geophysical Survey of the Russian Academy of Sciences (GS RAS). In previous years, the “method of standing waves” was created and put into practice. It helps to separate natural oscillation modes of buildings and other engineering structures. The natural oscillations of hundreds of various objects (buildings, bridges, dams, etc.) had been studied and identified. We assumed that the physical condition of studied constructions could be controlled during exploitation by measuring the changes of natural oscillation frequencies. That would help to identify the appearance of defects in constructions, to prevent the risk of their destruction. However, it turned out that not everything is that simple: changes in frequency values are logically affected by changes in the environment around the studied objects. This article provides examples of these relations, influence of changes in environmental temperature, mass of objects and precipitation on the frequencies of natural oscillations.
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