Professor M. Streletsky about methods of calculating structures and buildings in accordance with the boundary states and the main directions of its development
Journal Title: Eminak - Year 2017, Vol 1, Issue 3
Abstract
The article highlights the contribution of Professor M. Streletsky in solving the problem of the stock factor, taking into account the variability of the main parameters for the proposed designs. Prior to calculations on the basis of a probabilistic approach in engineering practice it was usually assumed that the stock ratios are a special number endowed with nature by some exceptional properties. It was assumed that the exact observance of it ensures the reliability of structures, while even a slight decrease in it entails a danger to the construction. However, for the compiler of the norms of calculation, the stock factor has always remained a generalized reflection of precautionary measures that provide a generally satisfactory level of security. The choice of the value of the stock factor for buildings of different types became increasingly differentiated over time. For example, in a road bridge, the load distribution depends on the location of cars at different points along the width of the roadway, and in the railway bridge loads are distributed only in places where laid rails are laid. The expected load on the railway bridge is close to reality, since the train always moves along the line of account, which does not occur when driving on a highway bridge. Therefore, in calculating the design of a road bridge, the coefficient of the stock of strength is considerably greater than that of the railroad. At the same time, the calculation of structures for permissible stresses or on the limiting load deals with a single factor of the stock irrespective of the working conditions of the structural elements and almost regardless of the types of loads. Analyzing this question, Professor M. Streletsky in the 40 years of the twentieth century clearly formulated the idea of a separate analysis of the variability of loads and strength of materials and their separate consideration in the norms – an idea that was the basis of the method of calculating the boundary states.
Authors and Affiliations
Oksana Pidkoshanaya
Keywords
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