DEGRADATION PROCESSES AND RESIDUAL RESOURCE DURABILITY OF BRIDGE ELEMENTS
Abstract
The article considers the impact of degradation processes on the load capacity of load-bearing bridge structures in order to assess the residual life of their durability. The nature and rates of corrosion and fatigue wear of structures, as well as the impact of increasing operational vehicle loads on the reduction of load capacity stocks are studied. A probabilistic distribution of the effects of operational automobile loads on bridges is constructed, approximated by the normal law (Gauss distribution). The concept of non-exceedance probability of the limit state is introduced, as the value of exceeding the load capacity of the average operating loads, calculated in average square deviations. The standard value of the non-exceedance probability of the first limit state is selected as a criterion for limiting corrosion wear for the entire life of the bridge. The moment when the actual non-exceedance probability is reduced to the standard level determines the durability resource of the structure. Durability due to fatigue wear is estimated based on the linear theory of fatigue damage accumulation
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