BUCKLING BEHAVIOR AND OPTIMISATION ANALYSIS OF PRESTRESSED STAYED STEEL COLUMN
Pengcheng Li 1, 2*, Bin Jia 1,2,3 and Hao Wang 4
1 Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China
2 School of Civil Engineering, Chongqing University, Chongqing 400045, China
3 Sichuan Institute of Building Research, Chengdu, Sichuan 610081, China
4 Department of Structural Engineering, Tongji University, Shanghai 200092, China
A prestressed stayed steel column, which comprises a main column and prestressed stays, has been proved to be an efficient way to enhance the buckling behaviour of steel columns. In the past, much emphasis was placed on investigating the buckling of this structural type, and it has been demonstrated that the crossarm length is a crucial factor affecting the buckling behaviours. To determine the optimal crossarm length, it is essential to conduct large amounts of numerical analysis in previous. This current work proposes an optimization method to determine the optimal crossarm length based on linear buckling theory. The optimization results were validated by numerical results obtained from ABAQUS, and it has been confirmed that this optimization method proposed in this study is accurate enough to determine the optimal crossram length. In addition, nonlinear buckling analysis has also been conducted to investigate the post-buckling behaviour of prestressed stayed steel column, and to examine whether the optimal crossarm length correspond to the actual buckling strength of the stayed steel columns.
Prestress; Optimisation; Stability behaviour; Numerical analysis; Buckling strength