- DEPARTMENT "TESTING STRUCTURES" of NRU MGSU - 60 YEARS
- Microstructural Monitoring As A Risk Management Factor In The Operation Of Metal Structures
- UDC 691.714.122/.124
doi: 10.33622/0869-7019.2023.03.36-41
Anna V. KORNILOVA, kornilovaav@mgsu.ru
Moscow State University of Civil Engineering (National Research University), Yaroslavskoe shosse, 26, Moscow 129337, Russian Federation
Abstract. The article is of an experimental and analytical nature and is devoted to substantiating the need for microstructural monitoring of critical building structures. A classification of the parameters of building steels according to the degree of their suitability for microstructural monitoring has been carried out. All parameters of building steels are divided into metal structures that do not change during operation (the degree of deoxidation and segregation of harmful impurities) and parameters that are considered unchanged during stationary loading of the structure, but change when non-stationary loads are applied (chemical, phase composition and grain size). Conducting microstructural monitoring for building structures will make it possible to reduce the risks during their operation by reducing the likelihood of an accident. In the experimental part of the work, modeling of the fire effect on metal structures during a fire and the temperature effect during operation under thermal cycling conditions (shops of metallurgical enterprises) was carried out. It is shown that the transformation of lamellar perlite into granular during thermal cycling reduces the strength and bearing capacity and should be monitored by microstructural monitoring. A patent-protected method for determining the temperature effect on a metal structure has been developed, linking the most structure-sensitive characteristic - the coercive force and hardness of the surface layer with the magnitude of the temperature effect.
Keywords: metal structures, micro-structural monitoring; phase composition; grain size; segregation, fire impact in case of fire; thermal cycling - REFERENCES
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