Experimental investigation on hexagonal steel tubular columns filled with plain and fiber reinforced concrete under eccentric compression load

Document Type : Research Article

Authors

1 Civil Structural Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

2 Faculty member and Secretary of Construction Management / Ferdowsi University of Mashhad

Abstract

Due to the advantages of Concrete Filled Tube columns (CFT), their attention is increasingly on the rise. Despite the great research done in these sections, in some cases, as in the case of less frequent sections or using different types of concrete, the need for research to complete the design criteria and guidelines seems necessary. The present study was conducted with an experimental approach to study the behavior of CFT columns under eccentric load. In this study, 8 CFT columns with a hexagonal cross-section of 150 cm in length were tested. Concrete used as the core of the samples was simple concrete and fiber concrete. The displacements in two directions of the longitudinal and lateral has been recorded and the force-displacement diagram for all samples in both directions has been drawn. Parameters such as bearing capacity, ductility index, energy dissipation and effective hardness have been analyzed and compared. Based on the comparison of the results, it was found that in columns that are only under axial load, the increase in concrete core strength significantly increases the bearing capacity of the specimens, so that an increase of about 50% of the concrete core strength causes an increase of about 20% of the loaded capacity of the specimen; However, by increasing the bending moment, the effect of concrete core resistance is greatly reduced. Also, it was found that specimens filled with fiber concrete have a greater ability to maintain effective hardness. It also seems that the presence of fibers in concrete affects the ductility and energy dissipation parameters.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 6
September 2020
Pages 1379-1404

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