Numerical Study on the Various Profile Sections of Concrete Filled Steel Tubular Columns Under Compression

Axial load carrying capacity for wide range of short concrete filled steel tubular (CFST) members with different cross-sectional profiles has been evaluated in the presented manuscript. Numerical studies are carried out through Finite-Element based demonstration and it has been accomplished in ABAQUS 6.13 package for relevancy of analytically predicted axial load carrying capacity by Unified Formula. To validate the results from the Unified Formula with the experimentally available literature, finite element-based models have been generated for hollow and solid sections of CFST columns. These sections are circular, octagonal, and square in profiles. A total of 31 hollow and 24 solid circular columns, 9 hollow and 9 solid octagonal columns and in last 9 hollow and 38 solid square CFST columns are examined for the persistence of the results. Obtained results through simulated models has been evaluated and validated with the existing results of different researchers. Through close inspection it is found that the proposed Unified formula predicts satisfactory results when compared with the result of established models. Further it is concluded that displacement in the direction of applied load is not uniform throughout the length of CFST columns. Therefore, using ring confinement technique for those regions, applied forces may be distributed more uniformly throughout the length of the members.