Axial Compression Behavior of Concrete-Encased CFST Columns
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Composite construction known as concrete-encased CFST is an outer covering of concrete surrounding a steel tube filled with concrete. It is employed as a structural member in multi-story buildings, large structures, bridges, and underground subway systems. Most of the literature deals with steel tubes filled with core concrete or concrete-encased steel tubes filled with core concrete with main reinforcement, but in the present study, CFST is used as conventional reinforcement. Therefore, five concrete-encased CFST columns and one normal reinforced concrete column were loaded axially. Variables were effects of CFST, percentage of steel tubes, outer concrete compressive strength, compressive strength of steel tube concrete, and ratio of unfilled steel tubes. The experimental test result of the reference concrete-encased CFST ultimate axial compression strength showed 65.1% strength of a conventional column. An increase in the ratio of CFST from 6.8% to 10.2% enhanced ultimate axial compression by 19.2% compared to the reference concrete-encased CFST column. Furthermore, a rise in the outer compression strength of the outer concrete from 15 MPa to 20 MPa resulted in an increase of 14.94% in ultimate axially compression loads. An increase of concrete compression strength within the steel tubes from 35 MPa to 45 MPa resulted in a slight increase of 0.62% in the ultimate load. The 16.8% reduction in the ultimate load, however, was due to the presence of a hollow steel tube inside the concrete-filled CFST. The validated finite element model was therefore employed to examine the effect of different parameters that affect the concrete column using a parametric study.
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[1] Han, L. H., & An, Y. F. (2014). Performance of concrete-encased CFST stub columns under axial compression. Journal of Constructional Steel Research, 93, 62–76. doi:10.1016/j.jcsr.2013.10.019.
[2] An, Y. F., Han, L. H., & Zhao, X. L. (2014). Analytical behaviour of eccentrically loaded concrete encased CFST box columns. Magazine of Concrete Research, 66(15), 789–808. doi:10.1680/macr.13.00330.
[3] Ali, A. A., Abdul-Sahib, W. S., & Sadik, S. N. (2013). Experimental behavior of circular steel tubular columns filled with self-compacting concrete under concentric load. Engineering and Technology Journal, 31(14), 2760-2772.
[4] An, Y. F., & Han, L. H. (2014). Behaviour of concrete-encased CFST columns under combined compression and bending. Journal of Constructional Steel Research, 101, 314–330. doi:10.1016/j.jcsr.2014.06.002.
[5] Chen, J. Y., Li, W., Han, L. H., Wang, F. C., & Mu, T. M. (2019). Structural behaviour of concrete-encased CFST box stub columns under axial compression. Journal of Constructional Steel Research, 158, 248–262. doi:10.1016/j.jcsr.2019.03.021.
[6] Ali, A. A., & Abbas, N. J. (2021). Behavior of Box Concrete-Filled Steel Tube Columns Considering Confinement Effect. International Journal of Steel Structures, 21(3), 950–968. doi:10.1007/s13296-021-00483-0.
[7] Al-Abbas, B., Abdul Rasoul, Z. M. R., Hasan, D., & Rasheed, S. E. (2023). Experimental Study on Ultimate Strength of Steel Tube Column Filled with Reactive Powder Concrete. Civil Engineering Journal (Iran), 9(6), 1344–1355. doi:10.28991/CEJ-2023-09-06-04.
[8] Abdulkhudhur, R., Al-Quraishi, H., & Elwi, M. (2024). Numerical analysis of concrete-encased concrete filled steel tube beams. AIP Conference Proceedings, 3219(1), 0236329. doi:10.1063/5.0236329.
[9] Al-Khazaleh, M., Kumar, P. K., Qtiashat, D., & Alqatawna, A. (2024). Experimental Study on Strength and Performance of Foamed Concrete with Glass Powder and Zeolite. Civil Engineering Journal, 10(12), 3911-3925. doi:10.28991/CEJ-2024-010-12-06.
[10] Al-Quraishi, H., Kammash, K. N. A., & Abdul-Husain, Z. A. (2022). Bond Strength Behavior in Rubberized Concrete. International Journal of Sustainable Construction Engineering and Technology, 13(1), 130–136. doi:10.30880/ijscet.2022.13.01.012.
[11] Abdulkhudhur, R., Al-Quraishi, H., & Abdullah, O. H. (2020). Effect of steel fiber on the shear transfer strength across a crack in reactive powder concrete. IOP Conference Series: Materials Science and Engineering, 737(1), 012001. doi:10.1088/1757-899X/737/1/012001.
[12] EFNARC. (2002). Specification and Guidelines for Self-Compacting Concrete. Association House, Chicago, United States.
[13] BS EN, 12350-8. (2010). Testing fresh concrete - Part 8: Self-compacting concrete -Slump-flow test. British Standards Institute (BSI), London, United Kingdom.
[14] BS EN, 12350-10. (2010). Testing fresh concrete - Part 10: Self-compacting concrete – L box test. British Standards Institute (BSI), London, United Kingdom.
[15] BS EN, 12350-9. (2010). Testing fresh concrete - Part 9: Self-compacting concrete — V-funnel test. British Standards Institute (BSI), London, United Kingdom.
[16] Al-Quraishi, H., Al-Farttoosi, M., & Abdulkhudhur, R. (2019). Compression Splices of Reinforcing Bars in Reactive Powder Concrete. Civil Engineering Journal, 5(10), 2221–2232. doi:10.28991/cej-2019-03091406.
[17] Mawlood, D., & Rafiq, S. (2022). Nonlinear 3D Finite Element Model for Round Composite Columns under Various Eccentricity Loads. Engineering and Technology Journal, 40(11), 1605–1614. doi:10.30684/etj.2022.133106.1168.
[18] Lubliner, J., Oliver, J., Oller, S., & Oñate, E. (1989). A plastic-damage model for concrete. International Journal of Solids and Structures, 25(3), 299–326. doi:10.1016/0020-7683(89)90050-4.
[19] Abdulkhudhur, R., Lafta, M. J., & Al-Quraishi, H. (2024). Estimation the flexural-tensile strength of fiber reinforced concrete members. AIP Conference Proceedings, 2864(1), 50005. doi:10.1063/5.0186183.
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