Study on behavior of concrete encased composite columns under axial load

Abstract

A Concrete encased steel (CES) composite column is an alternative to pure steel reinforced column. The application of such columns can be found in basement construction and metro railway stations. In this study, structural behavior of both partially encased composite (PEC) column and fully encased composite column (FEC) were investigated. A total of 12 specimens of partially encased steel composite column and fully encased composite column were analyzed. Analysis of columns was done in Ansys workbench. Steel profile used in the columns is H-section and cruciform section. The effects of some key parameters such as steel contribution ratio, end condition, and thickness of steel profiles on the performance of proposed column sections were investigated in terms of load-deformation relationship and strain behavior. Partially encased composite columns are found to be most efficient compared to fully encased composite columns. Flange thickness has a greater influence on load carrying capacity of the composite columns.