| China is constructing railway line for passenger traffic and the high-speed railroad massively at present, while the Chinese railroad development welcomes the new climax. 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.This paper, denpending on finite element method based on the detailed study of various, model used to compute the jointless switch's temperature stress and the displacement established, which was based on summarizing all kinds of computation theory in and out; then, nonlinear equation groups which was established according to energy variation principle and 'set-in-right-position' rule is calculated by matlab programming language; comparing computed result in this paper to correlation experiment result, thus the validity and accuracy of the model is proofed in this paper.The sensitivity of each jointless switch design parameter is analyzed based on the model. The results show that fastening resisitance is of importance to the force and displacement of jointless switch but the influence of ballast resistance is not important, which is useful to guide the structural design and maintenance of jointless switch.Aiming to ballestless-switch in railway line for passenger traffic and the high-speed railroad, the additional temperature force is calculated. The calcution result is compared with that of jointless switch with ballast. The result is useful to engineering construction.The resistance parameter of spacer is a key parameter of jointless switch design. Based on the model, the value of spacer resistance is analyzed and a practical method is provided. It provides a new way to analysis the design parameter of jointless switch. |
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