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The paper is aimed at stochastic calculation of nodal joints of cylindrical steel silos body, formed by using bolts. The research focuses on analyzing the reliability of a multi-bolt connection as a system of parallel elements. In particular, it is found that for homogeneous joint, when all the fastening elements belong to the same sample, the connection reliability is determined exceptionally by the statistical characteristics of the strength of one bolt, the number of bolts and stochastic characteristics of the load. For quasi-homogeneous joints, neglect for the failure order of individual bolts leads to a significant reassessment of their reliability. The formula for determining the random value of critical connection factor is obtained, and the following calculations are made. The density distribution of the maximum load probabilities was assumed in accordance with Gumbel double exponential law. The calculation results are presented graphically on a critical probability scale for different combinations of coefficients of the effort variations in each bolt. The graphical representation of changes in the system reliability rate is carried out, and the factors influencing on this process are determined. |
