Concrete-filled thin-walled steel tubular slender columns are studied in this paper to evaluate their stiffness. The slender columns have various steel tube thicknesses, length/diameter (width) ratios, and concrete compressive strengths. The columns are loaded by axial and eccentric loads. Two experimental tests of the slender and stub columns are described. Also, the finite element software ABAQUS is utilised to simulate and analyse the columns. The tested columns are simulated taking into account all their features in the tests to verify the simulation of the columns. The simulation results are compared with the tests results which reveal that good agreements exist between them. Thus, the proposed simulation method of the columns is verified. In order to assess the stiffness of the columns under different conditions, various load eccentricities (0 mm, 25 mm, and 50 mm), cross-sectional configurations (circular, rectangular, and square), and steel tube thicknesses (2 mm, 3.35 mm, and 5 mm) are adopted for the developed columns. The columns are simulated and analysed based on the verified simulation method considering the mentioned conditions. As a conclusion, the stiffness of the columns is generally reduced by the increase of the load eccentricity from 0 mm to 25 mm and 50 mm. Further, more uniform distribution of the stiffness is witnessed for the columns with lower eccentricities. In addition, the enhancement of the load eccentricity increased the reduction slope of the stiffness graph for the columns. Although the initial stiffness of the circular column is slightly lower than the rectangular and square columns, the stiffness has more uniform distribution which is preferred. Larger stiffness is achieved for the columns by increasing the steel tube thickness from 2 mm to 3.35 mm and 5 mm.
The present paper examines the energy absorption capacity of concrete-filled steel tube slender (CFTS) columns having different aspect ratios. The CFTS columns are nonlinearly analysed employing the finite element software ABAQUS. In order to validate the simulation of the columns, an experimentally tested CFTS column is simulated and its achieved result is compared with that of the tested column. Since it is concluded that there is a good agreement between the obtained results from the simulation and experimental test, the validation of the simulation is then established. The simulated columns are thereafter developed using different aspect ratios of 6, 10, and 13 and also considering the following parameters: load eccentricities, cross-sectional shapes, and steel tube thicknesses. The columns are nonlinearly analysed and the results are achieved from the analyses. The effects of the above-mentioned parameters on the energy absorption capacity of the CFTS columns are evaluated. From the results, it can be concluded that the energy absorption capacity of the columns is decreased by the increase of the load eccentricity or aspect ratio. Further, the energy absorption capacity of the circular CFTS column is greater than that of the rectangular and square CFTS columns. However, higher energy absorption capacity is accomplished for the rectangular column than the square column. Additionally, increasing the steel tube thickness leads to greater energy absorption capacity of the columns. Typical failure modes of the columns are assessed.
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