Abstract
Fire accidents are one of the most important problems of a society with advanced technology. Moreover, it is more related to advanced countries that have rich experience and knowledge of safety and new building materials. Various man-made factors contribute to the development of dynamic loads that affect the design of buildings and structures. The article discusses the frequency forms of natural oscillations of a multi-storey reinforced concrete frame building before and after the fire impact. The scenario of the fire impact of a multi-storey frame building on floors 2, 12 and 21 is considered, and then an analysis of 100 forms of natural frequencies is carried out. Based on the data obtained, the mathematical analysis in the Ansys software package, it was revealed that after the fire impact the frequency of natural oscillations forms up to 157 %. The average percentage change in the shape of the frequency of natural oscillations of a building makes up to 5,4 %. Changing of oscillation frequency depends on the level of fire exposure. A change in the natural vibration frequencies contributes to reducing the resistance to dynamic load, bringing the frequency in turn of the natural vibration forms closer to the frequency of the base oscillation, which can cause a resonant state.
Highlights
Various man-made factors contribute to the development of dynamic loads that affect the design of buildings and structures
The article discusses the frequency forms of natural oscillations of a multistorey reinforced concrete frame building before and after the fire impact
Based on the data obtained, the mathematical analysis in the Ansys software package, it was revealed that after the fire impact the frequency of natural oscillations forms up to 157 %
Summary
На основании полученных данных можно форм колебаний в момент времени до и после сделать вывод, об обеспеченности огнестойкости приложения пожарной нагрузки. Результаты расчета 100 форм частот собных несущих элементов здания находятся в нор- ственных колебаний в момент времени до и домативных пределах. Для анализа собственных частот колебаний щей температурной нагрузки в уровне привездания проведен модальный анализ с учетом 100 дены в табличной форме Для анализа собственных частот колебаний щей температурной нагрузки в уровне привездания проведен модальный анализ с учетом 100 дены в табличной форме (см. табл. 2)
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