Analysis Of Buffeting Response For Long-span Airfoil Bridge And Research Of Wind Tunnel Test

In recent years, with a modern bridge continuously raise the level of technology, even large rivers across the Strait Bridge will continue to emerge, these long-span bridges must overcome nature of the role of the wind.Wind load on the current structure of distribution main site measurement, wind tunnel tests and numerical simulation of three methods, including wind tunnel tests at this stage is the primary means to study ways more mature. But wind-tunnel test long cycle, but also to consume a large amount of manpower and material. Measured at the scene only after the completion of the structure, but also spend more, but also by the season, venues, and many other factors. Computer technology for the development of wind load of numerical simulation study has provided new ways and means, it has since become a field of wind engineering research and development of hot spots, compared to traditional methods it has unique advantages. Using computer numerical simulation technology can easily flow around the structure to simulate wind, the wind speed and wind pressure, and so are the distribution of physical characteristics, as forecast in the planning and design of the merits of the programme and to improve the programme so that the design of more rational to improve Design quality and efficiency.This paper bridge Liulin Haihe River in Tianjin for the study, its wind-resistant properties, especially the wind-induced response has conducted in-depth study. Mainly to the following aspects of work:First of all, this paper bridge dynamic characteristics of finite element analysis of the theory and methods of computation and use of space beam structure of the finite element model of the Haihe River in Tianjin Liulin dynamic characteristics of the structure of the bridge were calculated. Get their basic mode and cycle.Second, the buffeting on the basic theory and based on the analysis of the frequency domain buffeting response of theoretical calculations and the use of Scanlan Zhunding often aerodynamic buffeting of the formula and self-force and to consider aerodynamic admittance, the finite element method CQC Solving the development of large-span arch bridge buffeting response of the finite element method.Finally, the Tianjin Haihe River Bridge Liulin a wind tunnel test model gas shells, split by a sharp increase rough yuan device simulation at the bridge site of the wind environment, testing a different angle to wind down, the bridge the main wing, the wing, the main beam Buffeting response.Through the analysis contrast, obtained something to have the theory significance and the use value conclusion, and to designed has provided in the experimental support confirmation.