Numerical Analysis on Overall Stability Behavior of Prestressed Stayed Column

The finite element model of prestressed stayed column was established by the software of finite element analysis ANSYS, which was based on the correctdefinitions of element type, real constant and boundary conditionsin this paper. And two types of buckling modes of single-crossarmprestressed stayed columns in the plan were numerically analyzed. Firstly, the elastic buckling of prestressed stayed column and common column were analyzed by ANSYS and their results were compared with the results calculated in the literature to verify the correctness of finite element model. Then, extended parameter analysis was carried out for prestressed stayed column, and the influence of the length and diameter of single-crossarm and prestress on the elastic buckling loads was analyzed. Researches showed that when the symmetric buckling mode of prestressed stayed column occur, the elastic buckling loads Ncr increased with theincreasementof length of single-crossarm, but the diameter of single-arm had no influence on the elastic buckling loads Ncr. When the anti-symmetric buckling mode of prestressed stayed column occur, the elastic buckling loads Ncr increased with the increasement of diameter of single-crossarm, but the length of single-arm had a little influence on the elastic buckling loads Ncr. In addition, the elastic buckling loads increased with the increasement of prestress, but when the prestress reach to the optimal value T_opt, the elastic buckling load decreased with the increasement of the prestressed.