Train-bridge Coupling Vibration Analysis Of The High Speed Railway Under The Action Of Earthquake

As a high-tech products in the social progress, high speed railway is an advancedtraffic tools owing to its high speed, large capacity, low pollution, safety and reliability. Itshortens the journey time, creates great social benefits, saves a lot of energy, and reducesthe pollution of the environment. Constructing high speed railway has very importantsignificance for the development of national economy and the improvement of people’sliving standard, ensuring the operation safety is also an important issue.In order to study the operation safety of the high speed railway under the influence ofseismic load,the author of this paper establishes the two-dimensional train-bridge systemmodel, deduces the kinematic equation of the train-bridge system, inputs the seismic loadinto the train-bridge system by using the Large Mass Method(LMM),analyzes thecoupling characteristics of the kinematic equation, presents the specific methods and stepsto solve the kinematic equation of train-bridge system by displacement iterative method,writes programs to solve the kinematic equation of the train-bridge system and verifies thecorrectness of the program.On the basis of above, analyze the dynamic response of the train-bridge system underthe influence of seismic load with different train speed, different bearing stiffness,different incentive way and different structural forms, draw the following conclusion: theinfluence of earthquake to the train-bridge system dynamic response changes withdifferent train speed, but there is no obvious law between the degree of influence and thetrain speed; the maximum vertical acceleration of the bridge system decreases with thevertical stiffness of bearing increasing, the maximum longitudinal acceleration of thebridge system increases with the vertical stiffness of bearing increasing, the maximumvertical acceleration of the car body is less influenced by the vertical stiffness of bearing;the influence of multipoint incentive to vertical displacement and vertical acceleration of the bridge system has a great relationship with seismic phase difference, the influence ofmultipoint incentive to vertical acceleration of the car body is greater than that ofsingle-point incentive; the influence of earthquake to vertical displacement, longitudinaldisplacement, vertical acceleration of the continuous beam is greater than that of thecontinuous rigid frame, the influence of earthquake to longitudinal acceleration, pier toplongitudinal displacement of the continuous beam is less than that of the continuous rigidframe, and the influence of earthquake to vertical acceleration of the car body is less thanthat of the continuous rigid frame.