| Steel truss cable-stayed bridge in the current construction of railway bridges is using more and more. In recent years because of high-strength steel cables and the rapid development of new cable-stayed, long-span bridges have made great development. With the cable force calculation of a new Yangtze Bridge (81m+135m+432 m+135m+81 m), it mainly inquiry into a few following problems:(1) First of all, it introduces the commonly used methods of cable tension optimization. It calculates the bridge cable force with using the least bending energy method, rigid support continuous beam method and influence matrix method. Also it analyzes and compares the advantages and disadvantages of three methods. Preliminary summary of the cable-stayed bridge of completed status of the bridge transfer cable into the calculation process:the results of other methods as the basis for the target parameters matrix method to calculate the final completed status of the bridge cable tension.(2) Second, the thesis introduces the methods of the analysis on the cable-stayed bridge construction stage. It uses the influence matrix in forward analysis method and not closed-up matching force method. Because of its multiple fitting results and the deformation generated during the various stages that were considered, it can be very good considering the lingering effects of the construction phase.(3) The ballast in the cable-stayed bridge and live load is discussed. The ballast to control alignment that is not much affected, and for bearing the pressure of reserves, the pressure has great influences. You can not only use the cable of pier which is at the end and ancillary changes to reduce the pressure of the cable weight. By calculating the influences of the live load, we come to a conclusion of the internal force state of the cable-stayed bridge. Also it analyzes the influences of the bridge internal force state and loading of live load by different choices of cable-stayed bridge model. |
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