Structural Forcing And Stability Analysis For Through Tied-Arch Bridge Of High-Speed Railway

With the advantage of concrete-filled steel tublar being realized completely, such a structura is applied widely and get a rapid development. Especially the tied-arch bridge of through concrete-filled steel tube, it becomes a important bridge type in the high-speed railway bridge. Take a80m span bidge for example, the whole bridge static calculation the static force analysis of local arch foot and stability analysis are investigated in the thesis, The main research works follow as:1. In this thesis, the background of this topic is told about, and the need of the topics is highliged and emphasized, this topic will have a practical significance; at the same time, the development and classification of concrete filled steel tubular arch bridge are also reviewed, and its unique advantages are described.2. Taking a80m tied arch bridge for example, the general situation of the project is provided, and a finite element software of MIDAS/CIVIL is selected for the calculation of the whole bridge static force. Then it can be found that the results can fully meet the design requirements.On the other hand, the strength and crack resistance of the main girder also had been checked in this thesis.3. From the forcing aspect, the arch foot is the key part of the structure, a more precise and detailed analysis is needed, so a three-dimensional numerical model specially for the arch bridge foot with ANSYS is created, In this process, a new method is used in order to more accurately simulate the deformation and tendon retraction.4. A full-bridge stability analysis is gived in this thesis, and some main impact factors to the stability are dissertated and the different concepts of the two kinds of stabilities are discussed. The second kind of stability is considered, namely, the geometric nonlinearity and material nonlinearity are taked into account at the same time, the calculation results are compared with the elastic allowed value of the first kind stability.Finally, the research results of this thesis are summarized, besides, the further research orientations are indicated.