الفهرس 
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Abstract
Concrete-filled steel tubular (CFST) columns have been widely used in building industry, like the building of bridges, multi-story building, transmission tower and storerooms etc. Shapes of CFST columns were circular, rectangular, square, hexagonal, octagonal and elliptical hollow sections. The main advantages of using CFST columns were the economical, higher strength, higher stiffness, higher energy absorption capacity, fire resistance of structures, and reduced construction time and cost. Prior research focused on studying the behavior of short CFST columns, and very limited studies investigated the CFST long columns with oval, circular, and square cross-sections. On the other hand, no experimental or theoretical examinations of the conduct of CFST long columns for hexagonal cross-sections were found except only one research.Recently, only one research has appeared examining long columns of hexagonal cross-section subjected to eccentric compression. Therefore, study would complete the study of the behavior of short and long columns with a hexagonal cross - section using practical experiments exposed to an axial load. At the end of the experiment study, the program ABAQUS was used for developing the FE model, and the results from the experiments and earlier results for short and long columns available in the literature were compared with the FE model. Then, this proposed FE model was used in the parametric study, which studied the influence of column height (H), the steel cross-section’s thickness, fc, fy and the slenderness ratio (λ) on the behavior of HCFST long columns. The results of the experimental and FE models are compared with AISC, EN 1994-1-1 (EC4) and ECP 205 under preparation codes. Finally, design equations for the hexagonal concrete-filled steel long columns were proposed.