Aerostatic Stability Of Xihoumen Bridge During Erection And Strength Analysis Of Temporary Connection

Nowadays in the engineering, aerostatic stability problems for long-span bridge are not still researched enough, but 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 under strong wind load. Therefore, it is necessary to study on the problems of aerostatic stability of long-span bridges in the article.On the basis of the project of Xihoumen suspension bridge, using FEM program ANSYS, referring to the existing documents, aerostatic stability of the suspension bridge construction phase is studied in this paper. In the suspension bridge construction phase, the connection between the stiffening girders is adopted temporarily scissor, and structural rigidity is changing correspondingly with the structure system changed, so the effects of geometric nonlinearity should not be neglected. The analysis of finite element simulation to every construction process of suspension bridge is studied from the finite element method based on finite displacement theory and nonlinear theory, considering the reduction of the girder stiffness based on the method of equivalent stiffness and the aerostatic load nonlinearity. In order to give a valuable reference to wind resistance design for long-span suspension bridge construction, utilizing the method of increment and iteration combine together, the aerostatic effect during the stiffening girder erection is non-linearly analyzed, and the regularity of critical wind velocity of aerostatic buckling and the side aerostatic structure response which are varying with accomplishment ratio of stiffening girder erection and the initial attack angle of wind velocity is studied. Then the paper analyzed the stress of the temporary connection, considering the material plasticity.