Research On Longitudinal Force Cumputation Theory And Experiment Of Welded Turnout On Bridge

Along with the passenger dedicated special line, the fast railway and the urban track transportation construction and the development, as a result of the environmental protection request or the terrain limit, more and more welded turnout laid on the bridge, the super major bridge or the elevated structure. Laying on the welded turnout on the bridge, is a significant technical topic which in CWR development meets. Longitudinal force computation theory of welded turnout on bridge was researched in this paper, the longitudinal force computation model and computation program of welded turnout on bridge were established, the stress and distortion rule of turnout on bridge was analyzed, the design principle and the design method of turnout on bridge was proposed. The prime work in this paper is as follows:(1)The constitutive relation of turnout-bridge longitudinal affects is foundation and the key to solve the longitudinal force transmission question, in the systems analysis domestic and foreign welded turnout structure foundation, each kind of resistance parameter mechanics characteristic which affected the longitudinal force transmission of the welded turnout on bridge was analyzed, constitutive relation expression of each kind of resistance parameter was proposed. According to the characteristic of longitudinal reciprocity to the welded turnout on bridge, the reciprocity mechanism of the turnout and the bridge was proposed for the first time.(2) According to the reciprocity mechanism of the turnout and the bridge, in line with principle that the model can reflect the longitudinal force transmission characteristic of welded turnout on the bridge, simultaneously consider the computation conveniences and the reliable, and associate with the development of calculates mechanics at present, the "turnout-bridge-pier" integration model of longitudinal force of welded turnout on bridge to ballast and non-ballast was proposed. Using the non-linear finite element method to solve the model, the analysis program was established, and this program may analyze each kind of turnout on bridge.(3) Using the computational program, the longitudinal forces of welded turnout on bridge were analyzed, such as the expansion force, the bending force, the braking force, the rail-broke force and combination load, etc. the influence combination load to welded turnout on bridge was studied. In contrasts on the domestic and foreign design method and theoretical research of CWR on bridge, the design and calculate method of the welded turnout on bridge were proposed initially. (4) The primary influencing factors on longitudinal force transmission rail of turnout and bridge were analysis, which is core part of this paper. The stress and the distortion rule of welded turnouts, including single turnout, crossover and turnout group, on the simple beam and continuous beam bridges has analyzed. Some parameters influencing the longitudinal force and displacement of the welded turnout on bridge were analyzed, such as the longitudinal displacement resistance parameters, the connection way of turnouts, the stiffness of pier, the bridge span, the bridge style, the position of turnouts and bridges, and so on. The longitudinal force transmission rule of welded turnout on bridge was known well, the conclusions of parameter value, turnout and bridge stress and design were reached.(5) The stress and the distortion rule of welded turnout on the ballast and non-ballast track bridge were analyzed. From the longitudinal interaction point of view, the design principle of welded turnout on bridge wan proposed. The layout of turnouts and bridges on the typical rail station was proposed, which provides the basis for design of welded turnout on bridge.(6) The site test of longitudinal force and displacement of welded turnout on bridge on Meichi No.1 bridge in Zhejiang and Jiangxi railway. The resistance of track bed, the temperature force and displacement of welded turnout on bridge was measured; the site test proves that the calculation theory of welded turnout on bridge was correct.The author established comparatively prefect longitudinal force of welded turnout on bridge theory system. The calculating model, method and program are correct, and the results of welded turnout on bridge are credible. The laying, site test and operating of welded turnout on simple beam bridge in Zhejiang and Jiangxi railway show that the thesis works have important guiding significance to design and maintenance of welded turnout on bridge.