Experimental research of the stress-strain state of the railway track metal corrugated structures https://doi.org/10.33108/visnyk_tntu2017.04.067
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n the paper the scientific principles of a new device for the measurement and evaluation of the stress-strain state of transportation facilities under changing temperatures and loads have been developed. The technical problem solved by this paper deals with the making evidence-based decisions on the need for renewal of the element, control of the gradual reduction of the bearing capacity of the structural elements, determination of their real technical condition and residual life according to the transport facilities monitoring. In the heart of the new device is measuring of strain using analog-to-digital converter (ADC) and analog measuring bridge - tenzometer. The advantage of the proposed device is that the accuracy of measurements made by it does not depend on the length of the connecting conductors and supply voltage. The deformations caused by the temperature effects on transport facilities can be estimated and taken into account too. The problems of adapting of foreign regulations on the design of metal corrugated structures at the Ukraine railways and motor roads were analyzed. The results of experimental and theoretical calculations of bearing capacity of metal corrugated structures were presented. During dynamic experimental testing it was found: maximum relative vertical deformation of the pipe was registered for a freight train and equals 2.74 mm. In this case, residual deformation was 0.21 mm; relative horizontal deformation for a freight train equals 0.77 mm, here residual deformation being 0.038 mm. The maximum fibre stresses under the dynamic loading at the top of the pipe in specified points equal 10.7 MPa.
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