The article discusses a problem of the crack length influence on the reliability (safety) of reinforced concrete beams under conditions of limited statistical information about controlled parameters in the design mathematical models of limit state. Numerical examples revealed the possibility of practical application of the reliability analysis methods for inspections and determining the category of the technical condition of buildings and structures. The article offers the methods for reliability (probability of non-failure) analysis and the residual resource of reinforced concrete beams according to the criterion of the normal crack length in the tensile zone of reinforced concrete beams. The methods of reliability analysis constructed on the basis of possibility theory and fuzzy set theory. The algorithms of reliability analysis of reinforced concrete beams are presented on numerical examples of reliability analysis.
Abstract. The article describes the general problem of safe operation of buildings and structures with the dynamics of permafrost in Russia and other countries. The global warming on Earth will lead to global disasters such as failures of buildings and structures. The main reason of these failures will be a reduction of bearing capacity and the reliability of foundations. It is necessary to organize the observations (monitoring) for the process of reducing the bearing capacity of foundations to prevent such accidents and reduce negative consequences, to development of preventive measures and operational methods for the piles reliability analysis. The main loadbearing elements of the foundation are reinforced concrete piles and frozen ground. Reinforced concrete piles have a tendency to decrease the bearing capacity and reliability of the upper (aerial) part and the part in the soil. The article discusses the problem of reliability analysis of existing reinforced concrete piles in upper part in permafrost regions by the reason of pile degradation in the contact zone of seasonal thawing and freezing soil. The evaluation of the probability of failure is important in itself, but also it important for the reliability of foundation: consisting of piles and frozen soil. Authors offers the methods for reliability analysis of upper part of reinforced concrete piles in the contact zone with seasonally thawed soil under different number of random variables (fuzzy variables) in the design mathematical model of a limit state by the strength criterion.Keywords: permafrost; foundation; reinforced concrete piles; compression; theory of possibility; evidence theory; buildings; construction
РАСЧЕТ НАДЕЖНОСТИ ЖЕЛЕЗОБЕТОННЫХ СВАЙ НА СТАДИИ ЭКСПЛУАТАЦИИ В УСЛОВИЯХ ВЕЧНОЙ МЕРЗЛОТЫ
В.С. Уткин, Л.А. СушевВологодский государственный университет, г. Вологда, РОССИЯ Аннотация. Рассматривается общая проблема безопасности эксплуатации зданий и сооружений в усло-виях динамики вечной мерзлоты применительно к Российской Федерации и другим странам. Глобальное потепление на Земле приведет к глобальным катастрофам в виде разрушений зданий и сооружений. Ос-новной причиной разрушений будет снижение несущей способности и соответственно надежности осно-ваний фундаментов. Для предупреждения таких аварий и снижения негативных последствий необходима организация наблюдений (мониторинг) за процессом снижения несущей способности оснований фунда-ментов, разработка предупредительных мероприятий и оперативная оценка надежности (безопасности) свайных оснований. Основными несущими элементами основания являются железобетонные сваи и мерз-лый грунт. Сваи имеют тенденцию к снижению несущей способности и надежности верхней (надземной) части и части находящейся в грунте. В работе рассматривается проблема расчета надежности верхней ча-сти железобетонных свай на стадии эксплуатации зданий и сооружений в условиях вечной мерзлоты в связи с их снижением несущей способности в зоне контакта сезонного оттаивания и замерзания грунта. Оценка их вероятности безотказной работы ...
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