| Since the main cable of self-anchored suspension bridge is anchored to the ends of the stiffening beam,which eliminating the need for large anchorage.It has the advantages of novel structure,economy and aesthetics,good adaptability to terrain and geological condition and so on.Thence,it is well favored by bridge designers,and has been rapid development in recent decades.Nevertheless,due to the characteristics of self-anchored suspension bridge,it is necessary to ensure the main beam has a large enough stiffness so that the main cable can be properly anchored,which results in the self-anchored suspension bridge being more complex than other bridge types,particularly,the three-dimensional stress of main cable anchorage zone is extremely complicated,accordingly,it is of great significance to analyze the detailed force and fully understand the mechanical behavior of large-span self-anchored suspension bridge.Firstly,the development of suspension bridge and self-anchored suspension bridge are summarized,then,the previous research content and research status on the basic theory and mechanical behavior of the bridge are summed up,finally,on this basis,taking a large-span self-anchored suspension bridge with space main cable and concrete main girder as an engineering example,the overall static mechanical behavior and key parts local stress are simulated and analyzed.The main contents in this thesis are as follows:1.Based on the theory of suspension bridge and finite element knowledge,a three-dimensional finite element model of the bridge is established.The key point is to simulate the force situation of the bridge accurately and to ensure the analysis results reliably and accurately.2.The static mechanical behavior of the bridge is analyzed and studied detailly,which lay the foundation for the study of the key parts local stress analysis.3.Combined with the characteristics of the bridge,the key parts detailed local stress analysis are carried out. |
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