Towards predicting dynamic reliability of bridge spans

Abstract

In conditions of increasing impact of temporary live load, a premature wear of bridge superstructures occurs, operational strength and durability decrease. The paper discusses the dynamic reliability of the load-bearing elements of superstructures within the frame of ensuring the structure safety during operation, with regard to defects and overloads. Reliability is considered within the framework of random events and processes based on the possible superstructure exit beyond its serviceability based on the statistical dynamic properties. The par ametric and structural reliability is considered. Based on the mathematical statistics and random numbers theories, the dynamic reliability theory is characterized by the quality deployed in time. The effect of load variation for a long time is considered. The possibility is predicted for changing resources and structure failure. The dynamic reliability conditions are approximated based on the Gauss and Weibull distribution curves. Mathematical expressions are given to the structure indestructibility. The superstructure failure is considered with respect to possible overload using the principle of accidental release.