Mechanical Performance Analysis On Main Cable Anchorage Of Self Anchored Suspension Bridge

These years, the self-anchored suspension bridge has earned more and more attentions because of its beautiful appearance, strong adaptability and economical features etc, and a large number of self-anchored suspension bridges have been built both here and abroad. The best characteristic of self-anchored suspension bridge is that the main cable is fixed on the stiffening girder, so there is no need to build a large amount of anchors, and it will not be affected by landform, what is more, its shape is elegant. As for the large span self-anchored suspension bridge span, cable tension is relatively large, so the stiffening girder has to bear not only larger bending moment, but also larger axial force of the main cable, which leads to a complicated main cable anchorage structure. The main cable force of the anchorage zone transfers the load to the stiffening girder, and the stress distribution of anchorage zone is complex, in order to ensure the anchorage structure which can transfer the cable force smoothly and symmetrically to the stiffening girder, at the same time guarantee stiffness, joint strength and reliability of the main cable and stiffening girder, so the domestic and foreign scholars began to study on the different forms of anchorage.Anchorage structure of main cable is not only the key part of the design of self-anchored suspension bridge, but also a difficult point of design, and this step is also very important in the construction. The main cable force is transmitted to the stiffening girder by anchor structure, so that the force of the anchorage zone is relatively complex. Therefore, people pay more and more attention to the self-anchored suspension bridge's mechanical performance of the anchorage zone of the main cable, but the related literature is still relatively limited. At present, there are two methods to analyze the stress performance of the anchorage area, model test analysis method and the finite element analysis method. The result of the model test analysis method is more suitable to the actual situation, but the result of the finite element analysis can be used to guide the experiment, as long as make up for the deficiency of test by varying the parameters to investigate parameters.This paper will take the landscape bridge of Shenyang hun river as the background, using the finite element analysis method to analyze the main cable anchorage structure. It mainly introduces the history, the development and present searching stage of self-anchored suspension bridge, and makes a detailed summary the structural characteristics and stress characteristics of self-anchored suspension bridge. It summarizes the domestic and foreign typical self-anchored suspension bridge's construction, and introduces the types of anchorage structure and the related tests made by domestic scholars. It also discusses the experimental results, and summarizes the experience and laws learned form the test, pointing out the existing problems and the development trend. In the basic knowledge of the basic theory of finite element, it establishes the bridge model of the main cable anchorage zone segment by using the finite element software MIDAS/FEA, and dose space linear finite element analysis in details on the deformation and distribution condition of the anchorage in cable force and stress.Using the finite element software MIDAS/FEA to analyze ultimate capacity of the anchor box structure's elasticity and plasticity. It investigates the ultimate bearing capacity of anchor structure, and dose the optimization process of the stress concentration phenomenon in the most unfavorable cable forces situation, considering the geometric nonlinearity and material nonlinearity.Through calculation and analysis HunHe landscape bridge anchorage zone stress performance good, meet the design requirements, safety sotorage.Through this the efforts of this theses, I hope to provide the theoretical basis for the design of similar main cable anchorage structures.