| Large displacement, lateral stability limit small-span and mid-span suspension bridge development. To solving these problems, people present stable type suspension bridgefor enhancing common suspension bridge lateral stability in structure. Anchor is one of the key composition bridge, it must bearing great pulling force that transmit from the main cabe, and should pass them to founction through the anchor system ; and main function of the pier that is to bear press of the bridge tower and pulling force of the reverse tense cable , then passing on the base, their regular running to make the bridge work in good condition.Numerical simulation and designation of the anchor and pier of stable type suspension bridge is the background of this thesis, the main works of this thesis are as follows:1. The development course of native and abroad Suspension bridge is overviewed, at the same time .designation and construction of the basic situation of the anchor is also overviewed; the difference and the relation are introduced in this thesis about the stable suspension bridge and the common suspension bridge.2. Chose a proper type , a credible anchor system and take a reasonable size is most important step for an anchor designation of the stable suspension bridge.3. In this thesis, the gravitational anchor is taken as main research object, the anchor system, especially the prestress anchor system: a popural anchor system that bear and pass pulling force of the main cable is discussed, it is believed that the angle of the main cabe and distance between the dispersion cabe saddle and the front anchor facet, between the front anchor facet and the back anchor facet are the key effect factor of the anchor system size. And narrating the size depends on the degree of the pulling force, a reasonable size should provide a sufficient work room for the anchor system.Designation of the pier that fixing reverse cable is mainly the designation of the anchor-pole, main designing works consist of work mechanism , load transmission and confirm bearing force of the anchor-pole.4. Afterwards, structural analysis is the next important step in the designation. As a solid structure, the analysis should be taken both on the whole stabitity andthe partial stress of the local space FEM.5. On the basis of the finite element theory, introduce the elasto-plastic theory of the basic rock; To the finite element theory of the anchor great bulk RC: The damage norm of the concrete, native forms choosing, native forms of the reinforceing steel bar are discussed and analysised in the thesis.The entire style finite element model is choosed to analyze the anchor; To the finite element analysis of the pier, this thesis takes the entire model and the separate model to calculate and analyze, the separate model is adopted to erect model of the anchor-pole, and the entire model is adopted to erect other parts of the pier.For testifying the rationality and validity of the the entire model, the thesis gives two simple example about RC beam, make use of the equality of the entire model and the separate model, the entire analysis method that is applied to analyze the anchor system in the thesis testified is right.6. In analyzing the partial stress of the local space FEM, the thesis relying on ANSYS software successfully establish the FEM model of the anchor and pier structure.When the results are analyzed, to the partial space stress and displacement of the anchor and the pier having reverse cable and having not reverse cable are calculated and analysed with deferent loading conditions.At last , according those result put forward some advice that is expected to provide reference for designing and constructing similar anchor-system in future... |
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