THE INFLUENCE OF SECTION ASPECT RATIO ON THE MECHANICAL PERFORMANCE OF PARTIALLY ENCASED COMPOSITE COLUMNS
Jie Liu1*, Yiyi Chen1
1 State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China
At present, the research on partially encased composite (PEC) columns mainly focuses on square section, few studies on the columns with different section aspect ratio. However, in resident buildings, the requirement to conceal column into walls ask variety of aspect ratio of column section. The different aspect ratio will lead to different constraint of steel flange on the concrete, and when the aspect ratio is different, the load proportion that concrete bear will be different, so the mechanical properties of the column will be different. At the same time, the width-thickness ratio of flange, the spacing of links will affect the confinement of concrete, and then affect the mechanical behaviour of the PEC columns. In this paper, the finite element model with dynamic explicit method was developed and it was validated by test results in both capacity and deformability of the PEC columns. Then it was used to explore the influence of section aspect ratio, width-thickness of flange and link spacing on the distribution of concrete confinement zones and mechanics performance of PEC columns.
Partially encased composite column; Aspect ratio; Finite element method; Confinement of concrete