Abstract
This study reports the experimental results on the behaviors and modes of failure of the circular concrete specimens preconfined with steel jackets. A total of 30 specimens were tested in this study. The dimensions of the specimens were 150 mm in diameters and 300 mm in height. The main variables were the ultimate compressive strength of concrete, the thickness of steel jacket and the preconfining pressure. From the tests, it was found that the compressive strength and ductility of the tubed concrete specimens are increased significantly compared to the reference concrete specimens, depending on the variables used in this study. The tubed concrete specimens have a linear elastic behavior up to the ultimate compressive strength of the reference specimens or 50-70% of their first maximum compressive load. Then, the behavior of the specimens is nonlinear in the form of strain softening with very large deformation before failure.
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