Study On Style And Mechanism Of Aerostatic Stability For Long Span Bridge

With the span of bridges becoming longer and longer, the static and dynamic problems of the bridge structure induced by wind are more and more serious. According to the results of the wind tunnel model tests domestic and abroad, the critical wind speed of the aerostatic stability of long span bridge may be less than that of the aerodynamic stability. In addition, the effects of geometric nonlinearity and the aerostatic load nonlinearity of long-span bridges under strong wind load shouldn' t be neglected.Therefore, considering the effects of geometric nonlinearity and the aerostatic load nonlinearity, aerostatic load increment and double iterations(geometric nonlinearity iteration and aerodynamic force coefficient interation)were combined to analyze the aerostatic stability of the long span bridge. MSC.MARC and PYTHON scripts were used to develop the controlling procedure. Also, linear and nonlinear methods of the aerostatic stability were compared in this thesis. Some examples such as a cable-stayed bridge and a suspension bridge were used to illustrate style and mechanics of the aerostatic stability.Satisfactory results were shown using this method to analyze the aerostatic stability of large span bridges is reliable, and it is worth recommending.