Ecological Safety of Construction and Municipal Economy
DOI: http://www.dx.doi.org/10.24866/2227-6858/2019-4-17
Smirnova E.
ELENA SMIRNOVA, Candidate of Engineering Sciences,Associate Professor, AuthorID: 438628, SPIN: 6365-0860, e-mail: esmirnovae@yandex.ru
Department of Technosphere Safety,
Faculty of Engineering Ecology and Municipal Facilities
Saint Petersburg State University of Architecture and Civil Engineering
4 Vtoraja Krasnoarmejskaja st., St. Petersburg, Russia, 190005
Non-destructive testing methods as part
of an environmental monitoring system
in the restoration
of historic buildings and structures
Abstract: The author assessed the residual life of the Naval Cathedral of St. Nicholas in Kronstadt. A non-destructive method (the method of free vibrations) was used to examine the historical monument. Recently well-known among specialists, this approach is associated with assessing the residual life of a building by changing the periods of natural vibrations and is an effective tool for characterizing the properties of an object and identifying its defects. A comparison of vibration measurements in the framework of environmental monitoring in 2009 and 2018, in which the author participated, showed that the actual dynamic characteristics of the system of load-bearing structures in the diagnosis by pulsed effects of low intensity indicate a change in the rigidity of the surveyed structure. Studies a question about the impact on the cathedral of its bells have also been conducted. The vibration impact of the heavy 16-ton bells does not cause a negative effect on the supporting structures of the building. A fixed level of vibration in the frequency range that is dangerous for the supporting structures of the bell tower when the bells are in normal operation does not create the threat for the structures. The scientific basis and reliability of the results of dynamic tests in order to detect possible damage and a long-term predicted resource for the operation of the building are based on the parameters of the actual bearing capacity of individual nodes. The author re-examines the method of free vibrations, defining it as an environmental environment-forming factor that forms a safe human environment.Keywords: environmental safety, environmental monitoring, technosphere safety, non-destructive testing method, oscillations, dynamic parameters, historical monument.
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