Аңдатпа
The paper presents some results of measurements of relative strains and stresses in the middle section of reinforced concrete spans of the railway overpass from the impact of static loads, obtained with the use of hardware-software complex TENZO, which implements the interpretation and processing of digital records of primary transducers. The dependences of the stress-strain state of the girder spans of the railway overpass under static application of the test load consisting of the cohesion of three TEM-18 diesel locomotives and two loaded gondola cars (up to 25 tones per axle) were obtained. The purpose of this study was to ensure reliable and safe operation of artificial structures, and bring them into compliance with the requirements of the Rules of Technical Operation of Railways of the Republic of Kazakhstan. Periodic measurements of deformations of the span structure during 3–5 years allowed to forecast changes in its condition over time and determine the residual life in terms of load-bearing capacity and load carrying capacity. The differences in the numerical values of stresses in the elements of the railway overpass (right and left block) are a consequence of uneven wear of structures due to climatic factors. The results of the study are recommended to be used for inspections and tests of typical girder bridge spans, as well as in case of monitoring their technical condition under increasing operational loads. The safety of transport infrastructure facilities depends on the application of progressive technologies and scientific methods of monitoring to solve technical issues at all stages of operation. The use of digital hardware and software complexes in testing of bridge girders will significantly reduce the cost of current maintenance of artificial structures.