Estimation of seismic resistanceof an industrial building: probabilistic approach
This article represents the results of the research of general approaches and methods of risk evaluation for further exploitation of industrial buildings under seismic loads. Algorithms, developed or adopted by the authors of the article are designed for evaluating strength and stability of an industrial building, considered as a three-dimensional two-mass system, where the calculation points are located at the nodes of intersection of columns and brake structures of frames and the longitudinal axis of coating.Solving the problem of integral reliability and durability of buildings and structures as well as well-balanced design and strength under extreme conditions means to perform quantitative assessment of risk and to minimize it. Most existing analysis and risk evaluation methods are qualitative and estimate the probability of an emergency situation.Algorithm, offered by the authors of this article, includes assessment of seismic vulnerability risk of a construction in case of an earthquake of certain intensity. Problems, arising due to the complexity of probabilistic calculations, are solved by using automated control systems.Using classic methods of statistic dynamics and reliability theory, the authors offer a probability calculation, including the following:• Cop has aland quarter phase spectraldensity components of seismic movements;• entrance and exit spectrums;• dispersion of generalized coordinatesfor each natural frequency of a building;• waveform factor matrix;• effective oscillation period of a con-struction under seismic load;• failure frequencies at significancevalue;• total dispersion for all waveforms;• conventional, external and full seismicrisk.The given method of evaluating resistance of buildings and constructions to seismic loads is a probabilistic method and can be used as a basis for algorithms to automatize corresponding calculations during engineering design and exploitation of buildings and constructions.