Design of Dynamic Parameters for Simple Beam Bridges on High-Speed Railways

International Multi-Conference on Industrial Engineering and Modern technologies

Diachenko, L.^1 ; Benin, A.^1 ; Diachenko, A.^1

Emperor Alexander i Petersburg State Transport University, 9 Moskovsky ave., St. Petersburg

190031, Russia^1

关键词: Constructive parameters;    Design parameters;    Dynamic calculations;    Dynamic parameters;    High;    speed railways;    High speed train (HST);    Maximum acceleration;    Vertical accelerations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/463/2/022048/pdf
DOI  :  10.1088/1757-899X/463/2/022048

来源: IOP

【 摘 要 】

The article describes a technique of determining the maximum accelerations of beam span structures arising from vibrations of the action of high-speed trains. The reliability of the proposed methodology is confirmed by the results of numerical modelling of the passage of high-speed trains on spans with different speeds. The proposed dynamic calculation algorithm is based on the connection between the maximum acceleration of a span, its stiffness and inertial characteristics, the length of the span and the parameters of a high-speed train. As a result of the research, requirements were received to limit the minimum mass of spans with the condition that the permissible vertical acceleration of the span is not exceeded (3.5 and 5.0 m / s2 for ballast and ballastless bridges). Based on the presented results, recommendations were developed for limiting the lower limit of the natural frequencies of oscillations of simple span structures, that are different from the recommendations of the International Union of Railways (UIC), designed for speeds less than 250 km/h and given in the Eurocode. The presented limitations of the lower limit of the natural frequencies of the oscillations of the span structures (10 to 30 m in length) make it possible to assign the main design parameters at the initial design stage in such a way as to minimize the dynamic impact of the mobile load at train speeds of up to 400 km/h. The proposed recommendations on the assignment of a minimum mass of span structures and the limitation of the lower limit of the natural frequencies of oscillations of simple span structures are of great importance and can be used in determining the main constructive parameters. Accounting for these recommendations significantly cuts the labor costs for de-sign and reduces the likelihood of possible adjustments after performing dynamic calculations.