Large Single Cable Plane With Big Cantilever Cable-stayed Bridge Nonlinear Stability Study

Cable-stayed bridge with strong spanning capacity, the appearance of beautiful, and many other advantages to become the most rapid development in modern bridge engineering and one of the most competitive bridge type. Stability of long-span cable-stayed bridge as a whole and partial components become the key of the cable-stayed bridge calculation, it is also one of the factors restricting the development of large span cable-stayed bridge.The paper is based on the bolshoy ussuriysky island WuSu cable-stayed bridge as the engineering background, and based on analysis of nonlinear theory and stability theory, through the study of the finite element simulation analysis of the bridge, and study large carry arm single cable plane steel box girder cable-stayed bridge nonlinear factors sensitivity and stability of the structure, the main contents include:1. Through establishing WuSu cable-stayed bridge finite element model, analyze phases of self-respect, second phase dead load and live load the geometric nonlinear influence factors on the influence of structural internal force and deformation. The results show that the nonlinear effects of cable is the most obvious under self-respect and second phase dead load. Large displacement effect becomes the most obvious parameters on cable-stayed bridge calculation results under live load.2. Through finite element calculation, analyze the bridge operation stages of the whole structure of Linear elastic and nonlinear stability problems, and compared with geometrical nonlinearity and material nonlinearity on the influence degree of the stability analysis results; In addition, this paper analyzes the different transverse dimensions of the main tower on the overall and local stability of the bridge tower. Through establishing detailed analysis of key parts components model, and study stability of beam on the cable tower anchorage zone and the local mechanical properties and the thin-walled box girder. The calculation results show that WuSu cable-stayed bridge minimum stability coefficient is 6.513, the overall and local stability is enough.3. Combining with the load test of WuSu cable-stayed bridge, summarizes the static, dynamic load under the condition of load test results. In the evaluation of bearing capacity and the actual state of bridge structure vibration characteristics at the same time, results measured data also reflect the correctness and rationality of the finite element numerical simulation data.