FINITE ELEMENT ANALYSIS OF LOCAL BUCKLING OF STEEL AND COMPOSITE COLUMNS UTILISING HIGH AND ULTRA-HIGH STRENGTH STEEL
Zhichao Huang 1*, Yifan Zhou 1, Brian Uy 1, Huu-Tai Thai 2, Dongxu Li 1 and Chao Hou 1
1 School of Civil Engineering, the University of Sydney, Sydney, NSW 2006, Australia
2 School of Engineering and Mathematical Sciences, La Trobe University, Bundoora, VIC 3086, Australia
The utilisation of ultra-high strength steel can significantly improve the resisting strength and efficiency of steel and composite structures, it thus is a potential solution for modern high-rise construction. However, an in-depth understanding of the local buckling behaviour of ultra-high strength steels is still needed due to the lack of specific design standards. In this paper, a series of finite element analysis for local and post-local buckling behaviours of hollow and composite stub columns incorporating high and ultra-high strength steel was presented. The steels used in the analysis have nominal yield stresses of 690 and 960 MPa. A finite element model was developed by using the commercial finite element program ABAQUS and validated against existing experimental results. Effects of initial imperfections and residual stresses of high and ultra-high strength steels were taken into consideration in the finite element models. Parametric studies of sectional slenderness (width-to-thickness ratio) was conducted. The predicted ultimate strengths were evaluated through the simulation. The slenderness limits for both steel and composite columns were also identified based on the analysis. Besides, the prediction of compressive capacity for the hollow and composite columns was compared with existing codes of practice AS/NZS 2327.
Composite structure, Ultra-high strength steel, Local buckling, Slenderness limit