PROBABILITY REGULARITIES OF CONSTRUCTION FLOW FAILURE OCCURRENCE
The analysis of construction processes implementation shows that at random times dead time periods occur. In the course of their elimination for rather a long period of time a flow of failures occurs. For a construction flow the condition of stationary occurrence of dead time periods is not always met. Thus, probability of dead time period occurrence for a specific flow can change for various reasons within a certain time period. It would appear reasonable that at the beginning of the shift dead time periods of a certain flow are probable, namely, because of the late arrival of workers to the construction site due to waiting for construction structures and materials delivery, other difficulties of equipment conditioning and due to other reasons. The most important data of the process of dead time period occurrence (flow of failures) are process intensity and its parameters. Under a flow of failures in the reliability theory a succession of failures occurring one by one in random periods of time is meant. The failure flow type defines system properties and reliability criteria as well as reliability calculation methods and analysis. Therefore, studies of flow of failures play an important role while investigating system’s reliability, including those of a construction flow. Probability of failure occurrence during a certain period of time does not depend on the number of failures and their distribution before this period, i.e. failures are accidental and independent occurrences. Stationarity of a random process of time of failure occurrence means that at any time period probability of failure occurrence depends only on the time period but does not change due to the time axes shift. In the reliability theory several types of failure flows are distinguished. The correspondence of process of dead time periods for some flows to the Poisson failure flow is analyzed in the article.