Aerodynamic Simulation Of The Long-span Suspension Bridge

The development of modern materials , construction methods and design theories has resulted in a new generation of light weight that are flexible and low in damping. Such structures are generally more susceptible to the action of wind. Suspension bridges and cable-stayed bridges are typical structures susceptible to wind-induced problem. In recent years,many long-span suspension bridges have been built in our countris. These bridges are longer then those early builted. Wind effects on the structrues has come to our attention. In pursuit of economical and safe designs, wind can not be ignored and it is the one of most impotant factors of design. For flexible long-span bridges are vulnerable to wind ,it is essential to develop realistic analysis procedures for predicting their behavior under aerodynamic excitation. The characteristics of wind have been studied in details in this paper. Simulation of wind load has been studied too. Based on finite element software, a numerical solution to investigate flutter instability and buffeting response of long-span suspension bridges under turbulent wind excitation is developed. The following is a list of my works.Firstly, in this paper the author has tried to outline the history of investigation of wind-induced problems and the main trends in the field.Secondly, this paper presents a general discussion of the basic wind characteristics and the disaster induced by wind. Based on the spectral density function, an efficient and practical method of wind loading simulation is presented. For the simulation, Multidimensional Auto Regressive Models(MARM) is used, and BIC Rule is used for confirming the rank of MARM.The subject of the third part is devoted to the response of engineering structures to wind loading. The results of Scanlan R. H.'s research have been used. Based on the results and finite element formulation, the flutter force has been considered as equivalent aerodynamic stiffness matrix and equivalent aerodynamic damping matrix. And presents a numerical solution of a model that had been used by Thiele. Lastly,a real project of long-span suspension bridge has been discussed.The bridge isEast Sea-route suspension bridge of Xiamen Haicang Bridge.