Finite Element Numerical Analysis Of Vehicle-line-bridge Coupling Vibration System

With the development of high-speed railway construction, the lines put forward higher requirements for its regularity, stability and economy. More and more theoretical design and practical engineering problems need to be solved. As earthquakes occur frequently all over the word, especially in recent years, many high magnitude earthquakes result in heavy casualties and huge economic losses. This paper worked on the basis of previous studies, carried out the following research work by the surport of The National Natural Science Fund "Dynamic interaction theory and the experimental research of pier-pile-soft soil foundation system under High-speed train load "(No.:50808177):1.Based on the basic theories on vehicle engineering, bridge engineering, structural dynamics, wheel-rail contact analysis and earthquake engineering, vibration foundations of vehicle-bridge-pier-pile-soil-coupled system are established, and its resolution is discussed.2.The rails, piers and piles are established by beam elements, the box girder is established by shell elements, and the soil is established by solid elements. The relationship between wheel and rail is simulated by contact element, and the impact of semi-infinite soil on structure is simulated by three-dimensional viscoelastic boundary.3.Finite element model is established and the modal analysis of the bridge is conducted. Analysis and comparison of the coupling of vehicle-bridge system traffic in four different conditions:1) different simplified vehicle models;2) FEM models use different types of elements;3) different bridge system model;4) different position of train running and single or double lines of trains.4.Excited by the vertical acceleration of EL-centro seismic wave. Under seismic load, analyze the impact of train speed and site soil type.