Compressive Behaviour of Square CFDST Short Columns with Double Inner Steel Tubes

Abstract:

This study focuses on the experimental analysis of concrete-filled double-skin tubular (CFDST) short columns with double circular inner steel tubes under concentric axial loading. This cross-section layout promises to increase the ductile behavior of the compressive element and its energy absorption capacity, not to mention its ultimate axial strength. This research analyses main twofold variables: (i) Hollow ratio and (ii) eccentricity ratio (i.e., distance ratio between the inner tube’s separation and the sandwiched concrete width). As a result, load Vs. Axial deformation, load Vs. Axial strain curves, ductility index, strength index, energy absorption capacity, and ultimate axial capacity formulae for square CFDST columns with double circular inner tubes are reported. Key findings of this study show that (a) ductility is an intrinsic property of these types of sections; (b) the variation effect of hollow ratio influence inversely in the confined concrete strength of the element, (c) Eccentricity ratio has proved to be the least ultimate strength capacity influencer. However, its impact increases when it is jointly analyzed with the hollow ratio values. (d) The formulae proposed for predicting the ultimate capacity of CFDST columns showed good agreement with the experimental results. Thus, these expressions could be extended to the design of composite CFDST elements, provided a resistance factor based on a reliability analysis is incorporated.

• Periodical: Key Engineering Materials (Volume 920)
• Pages: 211-221
• DOI: https://doi.org/10.4028/p-j1w791
• Online since: May 2022
• Authors: Fernando Palacios Galarza*, Joaquín H. Aquino Rocha
• Keywords: CFDST Columns, Concentrically Axial Loading, Double Inner Sections, Eccentricity Ratio, Experimental Testing, Short Columns

References

[1] Y. Xiao, W. He, K.K. Choi, Confined concrete-filled tubular columns, J. Struct. Eng. 131(2005), 488-497.

DOI: 10.1061/(asce)0733-9445(2005)131:3(488)

[2] H. Shakir-Khalil, Composite shell columns, ETH – Bibliotek, Zurich, (1990).

[3] L.H. Han, Y.J. Li, F.Y. Liao, Concrete-filled double skin steel tubular (CFDST) columns subjected to long-term sustained loading, Thin-Walled Struct. 49(2011), 1534-1543.

DOI: 10.1016/j.tws.2011.08.001

[4] H.D. Wright, T.O.S. Oduyemi, H.R. Evans, The design of double skin composite elements, J. Constr. Steel Res. 19(1991) 111-132.

DOI: 10.1016/0143-974x(91)90037-2

[5] Q.Q. Liang, Analysis and design of steel and composite structures, CRC Press, (2018).

[6] M. Elchalakani, X.L. Zhao, R. Grzebieta, Tests on concrete filled double-skin (CHS outer and SHS inner) composite short columns under axial compression, Thin-Walled Struct. 40(2002) 415-441.

DOI: 10.1016/s0263-8231(02)00009-5

[7] W. Li, Q.X. Ren, L.H. Han, X.L. Zhao, Behaviour of tapered concrete-filled double skin steel tubular (CFDST) stub columns, Thin-Walled Struct. 57(2012) 37-48.

DOI: 10.1016/j.tws.2012.03.019

[8] S. Wei, S.T. Mau, C. Vipulanandan, S.K. Mantrala, Performance of new sandwich tube under axial loading: experiment, J. Struct. Eng. 121(1995) 1806-1814.

DOI: 10.1061/(asce)0733-9445(1995)121:12(1806)

[9] X.L. Zhao, R. Grzebieta, Strength and ductility of concrete filled double skin (SHS inner and SHS outer) tubes, Thin-Walled Struct. 40(2002) 199-213.

DOI: 10.1016/s0263-8231(01)00060-x

[10] L.H. Han, Z. Tao, H. Huang, X.L. Zhao, Concrete-filled double skin (SHS outer and CHS inner) steel tubular beam-columns, Thin-Walled Struct. 42(2004), 1329-1355.

DOI: 10.1016/j.tws.2004.03.017

[11] Z. Tao, L.H. Han, Behaviour of concrete-filled double skin rectangular steel tubular beam–columns, J. Constr. Steel Res. 62(2006) 631-646.

DOI: 10.1016/j.jcsr.2005.11.008

[12] H. Huang, L.H. Han, Z. Tao, X.L. Zhao, Analytical behaviour of concrete-filled double skin steel tubular (CFDST) stub columns, J. Constr. Steel Res. 66(2010) 542-555.

DOI: 10.1016/j.jcsr.2009.09.014

[13] Y.F. Yang, L.H. Han, B.H. Sun, Experimental behaviour of partially loaded concrete filled double-skin steel tube (CFDST) sections, J. Constr. Steel Res. 71(2012) 63-73.

DOI: 10.1016/j.jcsr.2011.11.005

[14] U.M. Sulthana, S.A. Jayachandran, Axial compression behaviour of long concrete filled double skinned steel tubular columns, Structures 9(2017) 157-164).

DOI: 10.1016/j.istruc.2016.12.002

[15] Z. Guo, Y. Chen, Y. Wang, M. Jiang, Experimental study on square concrete-filled double skin steel tubular short columns, Thin-Walled Struct. 156(2020) 107017.

DOI: 10.1016/j.tws.2020.107017

[16] X. Gu, X. Jin, Y. Zhou, Basic principles of concrete structures. Springer, Berlin, (2016).

[17] Chinese Standard, GB/T 228.1-2010, Metallic materials - Tensile testing - Part 1: Method of test at room temperature, (2010).

[18] Chinese Standard, GB/T 50081-2002, Standard for test method of mechanical properties on ordinary concrete, (2002).

[19] L. Han, Concrete Filled Steel Tubular Structures-Theory and Practice, China Science Press, Beijing, (2016).

[20] Y.F. Yang, L.H. Han, B.H. Sun, Experimental behaviour of partially loaded concrete filled double-skin steel tube (CFDST) sections, J. Constr. Steel Res. 71(2012) 63-73.

DOI: 10.1016/j.jcsr.2011.11.005

[21] T. Pi, Y. Chen, K. He, S. Han, J. Wan, Study on circular CFST stub columns with double inner square steel tubes, Thin-Walled Struct. 140(2019), 195-208.

DOI: 10.1016/j.tws.2019.03.028

[22] M.L. Lin, K.C. Tsai Mechanical behavior of double-skinned composite steel tubular columns. In Proceedings of the Joint NCREE-JRC Conference, (2003).

[23] R.F. Hassan, N.H. Al-Salim, N.S. Mohammed, H.H. Hussein, Experimental Study on Performance of Steel Fiber-Reinforced Concrete V-Shaped Columns, Buildings, 11(2021), 648.

DOI: 10.3390/buildings11120648

[24] X.L. Zhao, L.W. Tong, X.Y. Wang, CFDST stub columns subjected to large deformation axial loading, Eng. Struct. 32(2010), 692-703.

DOI: 10.1016/j.engstruct.2009.11.015

[25] L.H. Han, D. Lam, D.A. Nethercot, Design guide for concrete-filled double skin steel tubular structures, CRC Press, Boca Ratón, (2018).

DOI: 10.1201/9780429440410