Calculation of load capacity of the main metal truss of a railway bridge

Abstract

This paper presents calculations for mixed train schemes based on a mathematical model of moving units. Calculations of operating time were carried out considering the number of passing freight and passenger trains, the structure of freight traffic, information about the types of locomotives and loading of cars over the entire history of the bridge’s operation. The methodology is based on a comparison of the durability distribution functions of elements of superstructures of real bridges and laboratory samples, tests of which were carried out at NIIZhT. Based on the test data, equations of fatigue curves and characteristics of the scatter of durability of samples were obtained, which made it possible to calculate accumulated fatigue damage and compare their results with failure cases of real elements of span structures. The main purpose of calculating the load-carrying capacity of the main metal truss of a railway bridge is the results of calculations of the classes of truss elements determined with the main and additional combination of loads.