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Concrete-filled steel tube, as a new type of composite building material, has been widely used in civil engineering in recent years. In the past 10 odd years since 1990, nearly 100 concrete-filled tubular arch bridges have been built throughout the countrv, and there are many concrete-filled tubular arch bridges under construction or planning. However, it must be realized that there is an uneven development betvveen the present design theory and the practice, that concrete-filled tube. as a new type of composite building material, has not been yet adopted in bridge design codes, and also, that there no railway concrete-filled steel tubular arch bridges at present. In this thesis, on the basis of the existing successful designs. taking the railway concrete-filled steel tubular X-arch bridge, the first of its kind. in the Jiuqu River in the artery running from Beijing to Shanghai, as an example, the author made a summary of main parameters necessary to design of these bridges, made a comparison between existing calculation three models and performed the internal force calculation, carried out the stability analysis of the bridge under and after construction, discussed the effects of the numbers and positions of the lateral braces on the stability, and also, in the last part, gave out part dynamic analysis result.
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