Analysis Of Continues Welded Track Stability Based On Finite Element Method

Continues welded track provides effective assurance for the development of railway undertaking in the direction of high-speed and overloading for its superiority of advanced smooth and limited maintenance. Prevent the continues welded track bulging and keep the stability of it are the most important questions of design, construction, maintenance working on continues welded track. Above all, it has important of theory and practical significance to research the influencing factors of stability and the law of losing stability of continues welded track.Aiming at the ballasted continues welded track and turnout structure on the normal embankment, stability analysis model of continues welded track is established by finite element method to avoid the disadvantages of traditional methods, compile the finite element analysis program and make comprehensive analysis on the lateral deformation and vibrational characteristics caused by temperature force of the continues welded track and turnout structure. The main contents are as follows:1. Discuss the difference of the two methods by comparing the finite element method and "Tongyigongshi", the effect of curve radius, ballast resistance, and fastener stiffness on the lateral deformation of the track caused by temperature force are analyzed, quantitative analysis that the effect of ballast resistance variation and different pieces of sleeper failing on stability have been done.2. Analyze the effect of rail temperature, initial misalignment, ballast resistance, fastener stiffness on the lateral vibrational frequency and harmonic response, compare the effects of different factors on lateral deformation and vibrational characteristic caused by temperature force, put forward some suggestions on improving dynamical stability and preventing resonance incentive.3. Establish the continues welded turnout stability analysis model, analyze the effect of ballast resistance on lateral deformation caused by temperature force, calculate the optimum scheme of rivets arrangement when the partial ballast resistance decline, analyze the effects of rail temperature, initial misalignment, ballast resistance on natural frequency and harmonic response, provide suggestion on train speed and misalignment wavelength control according to lateral natural frequency in different situation.