Reliability theory application for building structures reliability determination

Nowadays the determination of building structures and their components reliability in the variable mode is an important task. These tests are as follows: the batch of products intended for test are first tested in the first mode, and then in the second mode. A certain moment of time for mode switching is selected randomly by a specified law. The product is tested in the variable two-stage mode. During testing, moments of time of product operation in the first and second modes are registered. Two experimentation programs that differ in the way of mode switching are proposed: program tests and dynamic tests. Examples of the methodology application to the determination of the product failure rate were discussed. Besides, the approximate calculation method of the reliability characteristics in the second mode was discussed