Abstract
The concrete-filled steel tubes (CFST) are used in the construction of various buildings, bridges and other high-rise structures. CFST structures are considered efficient and reliable, as they can improve the strength of the structure significantly and provide high resistance to compression in concrete and resistance to tension in steel structures. The steel tube will withstand partial axial load while providing confinement to the infill concrete under axial compression. The steel tube confinement provides a substantial part of the CFST columns' high axial strength capacity. In this study, CFST specimens with a concrete core of M15 and M20 mix are tested under axial compressive load. Load on the CFST samples is applied in two ways; when the load is applied on the whole and when it is applied only on the concrete portion. Three samples of CFST are tested in each case; thus, overall, 24 specimens of CFST stub columns are cast. These stub columns are tested against the cylindrical concrete specimen. The size of the cylindrical concrete specimen is 150 mm in diameter and 300 mm in height. The size of the steel tube used has an inner diameter of 150 mm, the thickness of the tube is 2 mm, and the height of the specimen is 300 mm. Overall, 12 specimens of concrete and 24 specimens of CFST are cast. Half of the samples are tested at 14 days, and the other half is tested at 28 days. The properties of steel tubes are tested through the tensile coupon test. The results of the axial compressive test are noted, and average values are used. The models were then numerically analyzed in ABAQUS and ANSYS to compare the behaviors simulated by both finite element software.
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Acknowledgments
We want to thank all the teachers and laboratory assistants in ADGITM, Guru Gobind Singh Indraprastha University, for helping and providing all necessary types of equipment required in the successful completion of the study.
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Conceptualization, HB, and AS; methodology, HB, and AS; software, AG and RM; validation, AG and RM; writing–original draft preparation, HB, AS, AG and RM; Writing—review and editing, HB, RM and AG.
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Appendix
Appendix
A1. Data of concrete mix
In IS10262-2009 the concrete mix is generally defined in ratios as Cement: Fine Aggregate: Coarse Aggregate. M15 is one the lowest grades of the mixes used in constructions written in Indian Standard Codes, followed by M20, which is more in used for constructional purposes. The M15 and M20 ratios are 1:2:4 and 1:1.5:3, respectively. The “M” stands for mix, and the corresponding number depicts the compressive strength in N/mm2 that a standard cube of 15 cm sides will achieve after a period of 28 days. The table given below show the contents used in the mix considering the moderate conditions.
Table A1. Mix design details | ||||
|---|---|---|---|---|
Properties | Cement content (kg/m3) | Water cement ratio (W/C) | Weight of aggregates | Weight of fine aggregates |
M15 | 240 | 0.5 | 1250 | 950 |
M20 | 380 | 0.45 | 1110 | 830 |
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Gupta, A., Mohan, R., Bisht, H. et al. Experimental testing and numerical modelling of CFST columns under axial compressive load. Asian J Civ Eng 23, 415–424 (2022). https://doi.org/10.1007/s42107-022-00432-0
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DOI: https://doi.org/10.1007/s42107-022-00432-0