Train-Bridge System Coupling Vibration And Program Design In High-Speed Railway

Recent years, the unceasing speed increasing of the existed line, the continual developing of high speed railway and the buildings of a large number of urban rail transit make people fully realized the necessity and importance of the research of vehicle-bridge interaction. According to the more and more rapid of the rail speed, more and more density of trains, and, more and more heavy of axle load, the vehicle-bridge dynamic interaction becomes a crucial factor day by day which involves in vehicle safety operation and bridge normal use. On the one hand, bridge structures subject to moving vehicle loads produce vibration, which directly affects the bridge's working state and service life. On the other hand, bridge vibration reversely contributes to the vibration of vehicles, which has influenced on the vehicle's stationarity and safety. So vehicle-bridge interaction vibration becomes an essential factor in evaluating the rationality of structural dynamic parameters, and vehicle-bridge dynamic analysis has been paid more and more attention by bridge researchers.In this thesis, the motion equations of vehicle with 23 DOFs(degree of freedom) are derived using the D'Alembert principle and Lagrange Equation. The motion equation of bridge is established by the finite element method. Subsequently, the element mass matrices and the element stiffness matrices of spatial beam element have been discussed. And also, the eigenvalue of structural vibration is solved using subspace iteration method in this thesis, the solving process of wheel/rail contact geometric and derivation of wheel track normal contact force is presented. By the same token, the contact areas of wheel/rail are determined adopting Hertz theory firstly in this thesis, and then the wheel/rail tangential creep force is calculated using Kalker's linear creep theory. The vehicle-bridge relationship and track irregularity are introduced. The vehicle-bridge dynamic equations are served using Newmark-βmethod. At last, this thesis discusses the vehicle motion safety and property of vehicle motion and their assessment index, such as derailment coefficient, reduction ratio of wheel load, Sperling index, etc.Based on the above theories, a relatively consummate frame of the vehicle-bridge interaction analysis system has been constructed adopting UML (Unified Modeling Language), and this system has been taken to implementation based on MFC (Microsoft Foundation Class Library) platform. Then a good vehicle-bridge interaction analysis system has been developed possessing human-computer interaction interface in this thesis. This system has fine reliability, reusability, and extensibility. Eventually, the 32m standard full span simple support box girder of qin-shen dedicated passenger line is analyzed using this system and getting a good result well anatomized the test result, so the reliability of the above theories and this analysis program has been validated.