On the issue of ensuring reliability of reinforced concrete structures of “northern execution”

The work is devoted to the design justification of the required resource of bearing capacity of bent reinforced concrete elements of “northern execution” based on ensuring the required reliability at the time of exhaustion of the frost resistance of concrete. The dynamic model of functioning of structure in severe climatic conditions is considered as a set of static tests at individual stages of cyclic temperature and humidity effects (FTC) formed on the basis of corresponding experimental samples of strength and deformability of concrete. For the criterion for reliability of structure, it is taken the value of strength and deformability of concrete, at which its bearing capacity over a normal section has a probability of at least 99.7%. Using graphic-analytical modeling, limit (failure) values were established and correction of the normative dependency by introducing a differentiating coefficient of reliability, accounting for the level of reinforcement and design negative air temperature, was proposed. The technical and economic unreasonableness of excessive, more than 80% of the boundary, reinforcement of normal sections of bent reinforced concrete elements of “northern execution” is established.