CALCULATION AND THEORETICAL ANALYSIS OF THE WORK OF ARCHED BRIDGE STRUCTURE FROM METAL CORRUGATED STRUCTURES

Abstract

The question of the peculiarities of the operation of an arched bridge structure made of corrugated metal under the load from the soil mass of the road embankment and temporary moving load, taking into account the elastic and elastic-plastic stage, is considered. According to the calculation and theoretical analysis, it is shown how the stress-deformed state of the arch structure changes with the appearance and increase of plastic deformations and with the appearance of plastic hinges. The nature and degree of dependence of the arch deflection on the vertical load in the conditions of its operation outside the soil of the embankment, i.e. as freely deformed, is also shown. Using a specific numerical example, it is proved that the limit state of an arch structure is formed based on its strength and bearing capacity without taking into account the lateral elasticresistance of the embankment soil to the deformations of the arch and taking it into account. The main provisions of the methodology of preliminary approximate practical calculations of a bridge structure in the form of a semicircular arch made of metal corrugated structures are proposed on the basis of the deformation criterion for assessing the bearing capacity and serviceability of an arched bridge structure as a "structure-soil" system.