Abstract
Purpose. The scientific work provides a comparison of the results of the movement of a high-speed passenger train across the bridge, obtained as a result of finite element modeling in the SAP2000 software package, and real tests of a double-span concrete railway bridge. Analysis of the rigid characteristics of flying structures. Methodology.The numerical method presented in this study shows valid results concerning the dynamic analysis of the behavior of bridges in conditions of high-speed train traffic. The factors influencing the dynamic behavior of bridges under moving loads, the influence of design parameters and rolling stock, as well as the interaction of the train and spans are determined. The system was used in the form of moving concentrated forces simulating the axes of the train. Findings. Maximum movements and accelerations were obtained as a result of the dynamic calculation for different speeds of the train and compared with practical tests. The correctness of the model of a span structure with regard to continuous ferroconcrete spans was verified. Originality. Within the framework of the work, the latest test results were used, including those with speeds calculated on the prospect of rail passenger traffic. For these tests, a model of a span structure was developed. Practical value. The results of the research can be used to plan the introduction of high-speed train traffic on existing and planned flying structures of reinforced concrete bridges. An approach to the design of span structures that will be effective when passing high-speed passenger trains is implemented.
Highlights
Grain is one of the main export goods of Ukraine
Taking into account the bridges of the Korean high-speed train (KHST), as trains will run at speed of 350 km/h, vibration analysis of bridges shall acquire more and more importance
In the case of the KHST running at high-speed, risk of resonance occurrence is larger than classical trains, and verification of vibration problems in the highspeed railway bridge is required during its design to guarantee the safety of the crossing train, which one is subordinated to strict crossing conditions
Summary
Grain is one of the main export goods of Ukraine. Over the period from 2006 to 2016, the share of its value in the total value of goods exported from Ukraine increased from 3.5 to 16.5%. In 2015/2016 marketing year among grain exporters, Ukraine, with an indicator of 38.7 million tons, took the third place, behind the United States (78.5 million tons) and the European Union (52.2 million tons). For Ukraine, this task is especially important, as the share of logistics costs in the cost of domestic grain is about 35%; for comparison, the share of logistics costs in the grain cost in the European Union is 12–16%, the United States – 9% [2]. Increasing the efficiency of grain cargo transporting by rail and water transportation is one of the key tasks that must be addressed to reduce logistics costs. The need to develop logistic schemes for the grain delivery to ports with the participation of rail transport is conditioned by the need to increase Ukraine's energy independence. When axle loads are repetitively applied at regular interval, as it is the case for trains, frequencies of the applied wheel load and of the bridge may coincide, favoring occurrence of resonance vibration in the bridge
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