Static Stability Analysis Of Six-span Cable-stayed Bridge

The thesis are mainly divided into two parts.The development situation and the stability analysis were introduced in the first part,together with implement methods of the stability analysis in the finite element programs.In the second part,based on Jiashao Bridge,the first kind of stability was analyzed by MIDAS and ANSYS,and the second kind of stability considering geometric nonlinearity and material nonlinearity are analyzed by ANSYS.The stability of several typical construction stage were analyzed in the thesis,and conclusions were drawed as followed:(1) the elastic stability factors and nonlinear stability factors all conform with the code requirments in every construction stage.(2) the elastic stability factors are the biggest,and the nonlinear stability factorsconsidering geometric nonlinearity changed a little.While he nonlinear stability factors considering both geometric nonlinearity and material nonlinearity reduced significantly.Thus the influence of material nonlinearity is larger for the cable-stayed bridge whose span is not particularly large.(3) the stability of the structure was changging continuously in the whole process of construction and the process of one constructon stage.The stability was relatively poorer especially in the later stage of the girder construction,the closure stages and secondary dead load stage.The results of the caculation and analysis of the thesis can provide certain reference to the study of static stability of more multispan cable-stayed bridges.