Steel and Composite Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Numerical study of concrete-encased CFST under preload followed by sustained service load

  • Li, Gen (School of Civil Engineering, The University of Sydney) ;
  • Hou, Chao (Department of Ocean Science and Engineering, Southern University of Science and Technology) ;
  • Han, Lin-Hai (Department of Civil Engineering, Tsinghua University) ;
  • Shen, Luming (School of Civil Engineering, The University of Sydney)
  • Received : 2020.01.15
  • Accepted : 2020.02.22
  • Published : 2020.04.10
⟨ Previous Next ⟩

Abstract

Developed from conventional concrete filled steel tubular (CFST) members, concrete-encased CFST has attracted growing attention in building and bridge practices. In actual construction, the inner CFST is erected prior to the casting of the outer reinforced concrete part to support the construction preload, after which the whole composite member is under sustained service load. The complex loading sequence leads to highly nonlinear material interaction and consequently complicated structural performance. This paper studies the full-range behaviour of concrete-encased CFST columns with initial preload on inner CFST followed by sustained service load over the whole composite section. Validated against the reported data obtained from specifically designed tests, a finite element analysis model is developed to investigate the detailed structural behaviour in terms of ultimate strength, load distribution, material interaction and strain development. Parametric analysis is then carried out to evaluate the impact of significant factors on the structural behaviour of the composite columns. Finally, a simplified design method for estimating the sectional capacity of concrete-encased CFST is proposed, with the combined influences of construction preload and sustained service load being taken into account. The feasibility of the developed method is validated against both the test data and the simulation results.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China (NSFC)

The current research is part of the Project 51678341 supported by the National Natural Science Foundation of China (NSFC). The financial support is highly appreciated.

References

  1. Attard, M. and Setunge, S. (1996), "Stress-strain relationship of confined and unconfined concrete", ACI Mater. J., 93(5), 432-442. https://doi.org/10.1016/j.engstruct.2012.03.027.
  2. ABAQUS (2016), ABAQUS Standard User's Manual, version 6.16. Providence, RI, (USA): Dassault Systemes Corp.
  3. Campian, C., Nagy, Z. and Pop, M. (2015), "Behavior of fully encased steel-concrete composite columns subjected to monotonic and cyclic loading", Procedia Eng., 117, 439-451. https://doi.org/10.1016/j.proeng.2015.08.193.
  4. CECS 188:2005 (2005), Technical specification for steel tube-reinforced concrete column structure, China Association for Engineering Construction Standardization; Beijing, China.
  5. Chen, Z.Y., Zhao, G.F., Yi, W.J. and Lin, L.Y. (2002), "Experimental research on behavior of high strength concrete column reinforced with concrete-filled steel tube under axial compression", J. Dalian Univ. Technol., 45(5), 687-691. [in Chinese] https://doi.org/10.3321/j.issn:1000-8608.2005.05.014
  6. Chu, K.H. and Carreira, D.J. (1986), "Time-dependent cyclic deflection in R/C beams", J. Struct. Eng., 112(5), 943-959. https://doi.org/10.1061/(ASCE)0733-9445(1986)112:5(943).
  7. DBJ/T13-51-2010 (2010), Technical specification for concrete-filled steel tubular structures, The Construction Department of Fujian Province; Fuzhou, China. [in Chinese]
  8. Eurocode 2 (2004), Design of concrete structures-part 1-1: general rules and rules for buildings, European Committee for Standardization; Brussels, Belgium.
  9. Han, L.H., Li, W. and Bjorhovde, R. (2014), "Developments and advanced applications of concrete-filled steel tubular (CFST) structures: Members", J. Constr. Steel Res., 100, 211-228. https://doi.org/10.1016/j.jcsr.2014.04.016.
  10. Han, L.H. and An, Y.F. (2014), "Performance of concrete-encased CFST stub columns under axial compression", J. Constr. Steel Res., 93, 62-76. https://doi.org/10.1016/j.jcsr.2013.10.019.
  11. Han, L.H., Wang, Z.B., Xu, W. and Tao, Z. (2016), "Behaviour of concrete-encased CFST members under axial tension", J. Struct. Eng. - ASCE, 142(2). https://doi.org/10.1061/(ASCE)ST.1943-541X.0001422.
  12. Han, L.H. and Yao, G.H. (2003), "Behaviour of concrete-filled hollow structural steel (HSS) columns with pre-load on the steel tubes", J. Constr. Steel Res., 59(12), 1455-1475. https://doi.org/10.1016/S0143-974X(03)00102-0.
  13. Han, L.H., Li, Y.J. and Liao, F.Y. (2011), "Concrete-filled double skin steel tubular (CFDST) columns subjected to long-term sustained loading". Thin-Wall. Struct., 49(12), 1534-1543. https://doi.org/10.1016/j.tws.2011.08.001.
  14. Han, L.H., Yao, G.H. and Tao, Z. (2007), "Performance of concrete-filled thin-walled steel tubes under pure torsion". Thin-Wall. Struct., 45(1), 24-36. https://doi.org/10.1016/j.tws.2007.01.008.
  15. Han, L.H., Tao, Z. and Liu, W. (2004), "Effects of sustained load on concrete-filled hollow structural steel columns", J. Struct. Eng., 130(9), 1392-1404. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:9(1392).
  16. Hillerborg, A., Modeer, M. and Petersson, P.E. (1976), "Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements", Cement Concrete Res., 6(6), 773-782. https://doi.org/10.1016/0008-8846(76)90007-7.
  17. Ichinose, L.H., Watanabe, E. and Nakai, H. (2001), "An experimental study on creep of concrete filled steel pipes". J. Constr. Steel Res., 57(4), 453-466. https://doi.org/10.1016/S0143-974X(00)00021-3.
  18. Kang, L., Leon, R.T. and Lu, X.L. (2015), "Shear strength analyses of internal diaphragm connections to CFT columns", Steel Compos. Struct., 18(5), 1083-1101. https://doi.org/10.12989/scs.2015.18.5.1083.
  19. Lam, D. and Williams, C.A. (2004), "Experimental study on concrete filled square hollow sections", Steel Compos. Struct., 4(2), 95-112. https://doi.org/10.12989/scs.2004.4.2.095.
  20. Li, S., Han, L.H. and Hou, C. (2018), "Concrete-encased CFST columns under combined compression and torsion: Analytical behaviour", J. Constr. Steel Res., 144, 236-252. https://doi.org/10.1016/j.jcsr.2018.01.020.
  21. Li, Y.J., Li, G., Hou, C. and Zhang, W.J. (2019), "Long-term experimental behaviour of concrete-encased CFST with preload on the inner CFST", J. Constr. Steel Res., 155, 355-369. https://doi.org/10.1016/j.jcsr.2019.01.001.
  22. Li, W., Han, L.H. and Zhao, X.L. (2015), "Behavior of CFDST stub columns under preload, sustained load and chloride corrosion", J. Constr. Steel Res., 107, 12-23. https://doi.org/10.1016/j.jcsr.2014.12.023.
  23. Li, W., Han, L.H. and Zhao, X.L. (2012), "Axial strength of concrete-filled double skin steel tubular (CFDST) columns with preload on steel tubes", Thin-Wall. Struct., 56, 9-20. https://doi.org/10.1016/j.tws.2012.03.004.
  24. Liew, J.Y.R. and Xiong, D.X. (2009), "Effect of preload on the axial capacity of concrete-filled composite columns", J. Constr. Steel Res., 65(3), 709-722. https://doi.org/10.1016/j.jcsr.2008.03.023.
  25. Ma, D.Y., Han, L.H. and Zhao, X.L. (2019), "Seismic performance of concrete-encased CFST column to RC beam joint: Experiment", J. Constr. Steel Res., 154, 134-148. https://doi.org/10.1016/j.jcsr.2018.11.030.
  26. Ma, D.Y., Han, L.H., Li, W. and Zhao, X.L. (2018a), "Seismic performance of concrete-encased CFST piers: analysis", J. Bridge Eng., 23(1), 04017119. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001157.
  27. Ma, D.Y., Han, L.H., Li, W., Hou, C. and Mu, T.M. (2018b), "Behaviour of concrete-encased CFST stub columns subjected to long-term sustained loading", J. Constr. Steel Res., 151, 58-69. https://doi.org/10.1016/j.jcsr.2018.09.016.
  28. Roeder, C.W., Cameron, B. and Brown, C.B. (1999), "Composite action in concrete filled tubes", J. Struct. Eng., 125(5), 477-484. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:5(477).
  29. Uy, B. and Das, S. (1997), "Wet concrete loading of thin-walled steel box columns during the construction of a tall building"., J. Constr. Steel Res., 42, 95-119. https://doi.org/10.1016/S0143-974X(97)00022-9.
  30. Varma, A.H., Ricles, J.M., Sause, R. and Lu, L.W. (2002), "Experimental behavior of high strength square concrete-filled steel tube beam-columns", J. Struct. Eng. - ASCE, 128(3), 309-318. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:3(309).
  31. Wu, X.G., Zhao, X.Y. and Han, S.M. (2012), "Structural analysis of circular UHPCC form for hybrid pier under construction loads", Steel Compos. Struct., 12(2), 167-181. https://doi.org/10.12989/scs.2012.12.2.167.
  32. Yang, M.G., Cai, C.S. and Chen, Y. (2015), "Creep performance of concrete-filled steel tubular (CFST) columns and applications to a CFST arch bridge", Steel Compos. Struct., 19(1), 111-129. https://doi.org/10.12989/scs.2015.19.1.111.
  33. Zhang, Y.Y., Pei, J.N., Hunag, Y., Lei, K., Song, J. and Zhang, Q.L. (2018), "Seismic behaviors of ring beams joints of steel tube-reinforced concrete column structure", Steel Compos. Struct., 27(4), 417-426. https://doi.org/10.12989/scs.2018.27.4.417.
  34. Zhou, K. and Han, L.H. (2018), "Experimental performance of concrete-encased CFST columns subjected to full-range fire including heating and cooling", Eng. Struct., 165, 331-348. https://doi.org/10.1016/j.engstruct.2018.03.042.

Cited by

  1. Analytical behavior of built-up square concrete-filled steel tubular columns under combined preload and axial compression vol.38, pp.6, 2020, https://doi.org/10.12989/scs.2021.38.6.617