Mechanical Analysis And Research Of Five-span Continuous Steel Box Girder Cable-stayed Bridge With Antisymmetric Steel Towers

With aesthetics research and development of the cable-stayed bridge, The structural types of cable-stayed bridge are gradual diversification, in recent years, some cities are emerging some special-shaped cable-stayed bridge coordinating with the urban environment based on the characteristics of the shaped cable-stayed bridge, the thesis study the force characteristics and construction control of the antisymmetric double towered cable-stayed bridge, designed to provide a reference value for the simulation and construction control of the same typed bridge. The main works involved in this research are as follows:The thesis summarizes the characteristics of the structure of the special-shaped cable-stayed bridge, the contents and the methods of analysis are reviewed. For the big ratio of width and span bridge, using grillage method or shell element method can be simulated, and getting the whole structure of work performance.In order to investigate the feasibility and accuracy of grillage analogy method to the wide box grider, the single grider model,the grillage model as well as the shell element model are established, and the stress,displacement,shearing force,bending moment,torquemoment results from the three models are compared, The analytical results show that comparring with the single grider method, the results form the grillage analogy method are in good agreement with he shell element method and suitable for precisely describing the mechanical properties of the wide box grider, and the normal results from grillage analogy method are acceptable from an engineering design standpoint.The thesis building up the integrated finite element model of The Qinglin Bay bridge by the grillage simulation, considering the bridge structure, loading conditions, boundary conditions, etc.According to the construction process, studying and analyzing the deformation and force characteristics of the various components in the construction stage, and were checking into a bridge state. Operational stage combined live load is also analyzed under The effect of the structure, validating the stress and displacement of this bridge to the standard in the limit state.The thesis uses the finite element analytical software ANSYS to build up the finite element integrated model including entity unit and plate-shell unit of the steel tower, analyzes the stress of the key position of the steel tower, and gets that stress are allowed in.Combined with the construction process, discussing the characteristic and difficulty of construction control, confirming the construction control method, determining the theoretical calculation methods of linear control to the steel towers and the steel grider,and the beginning tension of cable. And highlights the control theory and simulation methods of the whole girder falling. The controlled results were compared to verify the simulation and control theory of the bridge are reasonable and feasible.