Special Conditions Seamless Turnout Finite Element Analysis

China is constructing railway line for high-speed railroad and the passenger traffic massively at present. Jointless switch, as one of the key technologies on cross station line, presently comes to the hotspot and nodus on track structure research. Many experts in the world proposed all kinds of different jointless switch computation theory and the method, and have carried out the related experimental study. But so far, mature and unified method has not been agreed by the most engineers.This paper, depending on finite element method of the jointless switch's temperature stress and the displacement established, which based on summarizing all kinds of computation theory in and out. Then, nonlinear equation groups which was established according to energy principle and "set-in-right-position" rule is calculated by MATLAB programming language.The sentivity of each jointless switch design parameter is analyzed based on the modle. The results show that the temperature appreciation and fastening resisitance is of importance to the force and displacement of jointless switch, which is useful to guide the pavement and maintenance of jointless switch.Based on the finite element principle, analyse the influences of familiar five engineers on the longitudinal force and the rail displacement of continous welded turnout, such as the ballestless turnout, the half-welded turnout, the rigid frogs turnout, the different algebraic of the stress-free temperature and the rail creep forces. The results is useful to engineering construction.