Experimental Study of Octagonal Steel Columns Filled with Plain and Fiber Concrete under the Influence of Compressive Axial Load with Eccentricity

Document Type : Regular Paper

Authors

1 Department of Civil Engineering, Ferdowsi University of Mashhad, mashhad, iran

2 Ferdowsi University of Mashad

Abstract

In recent years, Concrete Filled Tube (CFT) columns have been very much taken into consideration due to the many advantages of the instrument. In experimental studies, the focus has been on compressive loading. Although in many cases the eccentric loading (the presence of a bending moment) has also been investigated, further research is needed in this regard. Therefore, in this study, the steel columns filled with concrete with a regular octagonal cross section were studied under the influence of pressure axial load with eccentricity. The parameters studied in this study include bearing capacity, coefficient of ductility and energy absorption. To test and compare the stated parameters, specimens of 150 cm height, which were filled with plain concrete and fiber reinforced concrete were tested. The compressive axial load has been applied to the specimens by the eccentricity of 50, 100 and 150 mm. The results show that at pure compressive loading, the increase in concrete core capacity increases the load bearing capacity of the specimens so that by increasing the concrete compressive strength by 50%, the bearing capacity of the cross section increases by about 15%. Also, based on the results, the average ductility coefficient for specimens was 7.4, and it seems that this value is independent of the type of loading. The use of concrete with intermediate grade resistance can increase the energy absorbed. However, according to the results, it seems that by increasing the bending moment the positive effects of the concrete core are greatly reduced.

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References

[1] S.R. Gopal, P.D. Manoharan, Experimental behaviour of eccentrically loaded slender circular hollow steel columns in-filled with fibre reinforced concrete, Journal of Constructional Steel Research, 62(5) (2006) 513-520.
[2] M.L. Yaghin, M. Ziyaeioun, Analytical Study of concrete-filled double skin steel tubular columns under interaction of bending moment and axial load, journal of modeling in emgeerning, 10(31) (2013) 15-23.
[3] S. Tokgoz, Tests on plain and steel fiber concrete-filled stainless steel tubular columns, Journal of Constructional Steel Research, 114 (2015) 129-135.
[4] S. Tokgoz, C. Dundar, Experimental study on steel tubular columns in-filled with plain and steel fiber reinforced concrete, Thin-Walled Structures, 48(6) (2010) 414-422.
[5] X. Chang, Y.-Y. Wei, Y.-C. Yun, Analysis of steel-reinforced concrete-filled-steel tubular (SRCFST) columns under cyclic loading, Construction Building Materials, 28(1) (2012) 88-95.
[6] A. Kheyroddin, H. Naderpour, M. Ahmadi, Compressive strength of confined concrete in CCFST columns, Journal of Rehabilitation in Civil Engineering, 2(1) (2014) 106-113.
[7] N. Jamaluddin, D. Lam, X. Dai, J. Ye, An experimental study on elliptical concrete filled columns under axial compression, Journal of Constructional Steel Research, 87 (2013) 6-16.
[8] Y. Lu, N. Li, S. Li, H. Liang, Behavior of steel fiber reinforced concrete-filled steel tube columns under axial compression, Construction and Building Materials, 95 (2015) 74-85.
[9] F.-x. Ding, J. Liu, X.-m. Liu, Z.-w. Yu, D.-w. Li, Mechanical behavior of circular and square concrete filled steel tube stub columns under local compression, Thin-Walled Structures, 94 (2015) 155-166.
[10] Y.-L. Long, J. Wan, J. Cai, Theoretical study on local buckling of rectangular CFT columns under eccentric compression, Journal of Constructional Steel Research, 120 (2016) 70-80.
[11] M. Elchalakani, A. Karrech, M. Hassanein, B. Yang, Plastic and yield slenderness limits for circular concrete filled tubes subjected to static pure bending, Thin-Walled Structures, 109 (2016) 50-64.
[12] M. Mahgub, A. Ashour, D. Lam, X. Dai, Tests of self-compacting concrete filled elliptical steel tube columns, Thin-Walled Structures, 110 (2017) 27-34.
[13] Y.-T. Wang, J. Cai, Y.-L. Long, Hysteretic behavior of square CFT columns with binding bars, Journal of Constructional Steel Research, 131 (2017) 162-175.
[14] M. Ahmadi, H. Naderpour, A. Kheyroddin, A Proposed Model for Axial Strength Estimation of Non-compact and Slender Square CFT Columns, 43(1) (2019) 131-147.
[15] S. Lin, Y.-G. Zhao, Numerical study of the behaviors of axially loaded large-diameter CFT stub columns, Journal of Constructional Steel Research, 160 (2019) 54-66.
[16] Y. Wei, C. Jiang, Y.-F. Wu, Confinement effectiveness of circular concrete-filled steel tubular columns under axial compression, Journal of Constructional Steel Research, 158 (2019) 15-27.
[17] H. Naderpour, K. Nagai, P. Fakharian, M. Haji, Innovative models for prediction of compressive strength of FRP-confined circular reinforced concrete columns using soft computing methods, Composite Structures, 215 (2019) 69-84.
[18] M. Haji, H. Naderpour, A. Kheyroddin, Experimental study on influence of proposed FRP-strengthening techniques on RC circular short columns considering different types of damage index, Composite Structures, 209 (2019) 112-128.
[19] J. Cai, Z.-Q. He, Axial load behavior of square CFT stub column with binding bars, Journal of Constructional Steel Research, 62(5) (2006) 472-483.
[20] S.-H. Lee, B. Uy, S.-H. Kim, Y.-H. Choi, S.-M. Choi, Behavior of high-strength circular concrete-filled steel tubular (CFST) column under eccentric loading, Journal of Constructional Steel Research, 67(1) (2011) 1-13.
[21] S.-W. Liu, T.-M. Chan, S.-L. Chan, D.K.-L. So, Direct analysis of high-strength concrete-filled-tubular columns with circular & octagonal sections, Journal of Constructional Steel Research, 129 (2017) 301-314.
[22] X. Mao, Y. Xiao, Seismic behavior of confined square CFT columns, Engineering structures, 28(10) (2006) 1378-1386.
[23] X. Qu, Z. Chen, G. Sun, Experimental study of rectangular CFST columns subjected to eccentric loading, Thin-Walled Structures, 64 (2013) 83-93.
[24] F.-x. Ding, Z. Li, S. Cheng, Z.-w. Yu, Composite action of hexagonal concrete-filled steel tubular stub columns under axial loading, Thin-Walled Structures, 107 (2016) 502-513.
[25] F.-x. Ding, Z. Li, S. Cheng, Z.-w. Yu, Composite action of octagonal concrete-filled steel tubular stub columns under axial loading, Thin-Walled Structures, 107 (2016) 453-461.
[26] J. Gao, W. Sun, K. Morino, Mechanical properties of steel fiber-reinforced, high-strength, lightweight concrete, Cement Concrete Composites, 19(4) (1997) 307-313.
[27] A. Standard, E8. Standard test method for tension testing of metallic materials, West Conshohocken : ASTM, (2004).
[28] A.S.f.T. Materials, Standard test methods for tension testing of metallic materials, ASTM international, 2016.
[29] T.C. Codification, Instruction for Seismic Rehabilitation of Existing Buildings Office of Deputy for Technical Affairs Technical Criteria Codification & Earthquake Risk Reduction Affairs Bureau ,Islamic Republic of Iran Management and Planning Organization, Tehran 2007.
[30] The tenth chapter of the national building regulations: Design and Construction of Steel Structures, Tehran, 2013.

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History

  • Receive Date: 07 June 2019
  • Revise Date: 22 March 2020
  • Accept Date: 07 April 2020

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