Steel and Composite Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Behavior of hybrid CFST with FRP-confined UHPC core under axial compression

  • Tao, Yi (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Gu, Jin-Ben (College of Civil Engineering, Tongji University) ;
  • Chen, Jian-Fei (Department of Ocean Science and Engineering, Southern University of Science and Technology) ;
  • Feng, Peng (Department of Civil Engineering, Tsinghua University)
  • Received : 2019.09.10
  • Accepted : 2021.06.17
  • Published : 2021.07.10
⟨ Previous Next ⟩

Abstract

A fiber-reinforced polymer (FRP)-confined concrete core that provides high strength and ductility under axial compression can act as strength enhancement in a hybrid column. In the present study, ordinary concrete was replaced with ultra-high-performance concrete (UHPC) to form an FRP-confined UHPC core (FCUC). The FCUC was embedded in square concrete-filled steel tube (CFST) columns to form a high-performance hybrid column (SCF-UHPC column for short). The axial compressive behavior of the SCF-UHPC was experimentally investigated using 12 SCF-UHPC columns and two ordinary CFST columns for comparison. The advantages of the SCF-UHPC include excellent axial load-bearing capacity, good ductility, and stable residual load-bearing capacity. The results show that failure of an SCF-UHPC column was caused by FRP rupture of FCUC, which occurred after steel tube buckling that results in the degraded stiffness. It was also shown that the load-displacement behavior of the SCF-UHPC composite column was determined by the UHPC core diameter and the corresponding confinement provided by the outer steel tube and inner FRP jacket. A hardening effect could be achieved when the confinement demand of the UHPC core was satisfied, whereas a plateau effect appeared if the confinement was insufficient. Furthermore, the load-bearing capacity and ductility of the SCF-UHPC columns improved with increased thickness of the steel tube and the FRP.

Keywords

Acknowledgement

The research presented in this paper was supported by the National Key R&D Program of China (2017YFC0703004), the National Natural Science Foundation of China (51978567) and ShaanXi Natural Science Foundation (2018JM5074).

References

  1. Cheng, S., Feng, P., Bai, Y. and Ye, L.P. (2016), "Load-Strain Model for Steel-Concrete-FRP-Concrete Columns in Axial Compression", J. Compos. Constr., 20(5), 04016017. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000664.
  2. Feng, P., Cheng, S., Bai, Y. and Ye, L.P. (2015), "Mechanical behavior of concrete-filled square steel tube with FRP-confined concrete core subjected to axial compression", Compos. Struct., 123, 312-324. https://doi.org/10.1016/j.compstruct.2014.12.053.
  3. Ghazijahani, T.G., Jiao, H. and Holloway, D. (2015a), "Rectangular steel tubes with timber infill and CFRP confinement under compression: Experiments", J. Constr. Steel Res., 114, 196-203. https://doi.org/10.1016/j.jcsr.2015.07.015.
  4. Ghazijahani, T.G., Jiao, H. and Holloway, D. (2015b), "Timber filled CFRP jacketed circular steel tubes under axial compression", Constr. Build. Mater., 94, 791-799. https://doi.org/10.1016/j.conbuildmat.2015.07.151.
  5. Gholampour, A. and Ozbakkaloglu, T. (2018), "Behavior of steel fiber-reinforced concrete-filled FRP tube columns: Experimental results and a finite element model", Compos. Struct., 194, 252-262. https://doi.org/10.1016/j.compstruct.2018.03.094.
  6. Kim, J.K., Kwak, H.G. and Kwak, J.H. (2013), "Behavior of Hybrid Double Skin Concrete Filled Circular Steel Tube Columns", Steel Compos. Struct., 14(2), 191-204. https://doi.org/10.12989/scs.2013.14.2.191.
  7. Lam, L. and Teng, J.G. (2003), "Design-oriented stress-strain model for FRP-confined concrete", Constr. Build. Mater., 17(6), 471-489. https://doi.org/10.1016/S0950-0618(03)00045-X.
  8. Liew, J.Y.R. and Xiong, D.X. (2012), "Ultra-High Strength Concrete Filled Composite Columns for Multi-Storey Building Construction", Adv. Struct. Eng., 15(9), 1487-1503. https://doi.org/10.1260/1369-4332.15.9.1487.
  9. Lim, J.C. and Ozbakkaloglu, T. (2014), "Confinement Model for FRP-Confined High-Strength Concrete", J. Compos. Constr., 18(4), 2537-2547. https://doi.org/10.1061/(ASCE)CC.19435614.0000376.
  10. Louk Fanggi, B.A. and Ozbakkaloglu, T. (2015a), "Behavior of Hollow and Concrete-Filled FRP-HSC and FRP-HSC-Steel Composite Columns Subjected to Concentric Compression", Adv. Struct. Eng., 18(5), 715-738. https://doi.org/10.1260/1369-4332.18.5.715.
  11. Louk Fanggi, B.A. and Ozbakkaloglu, T. (2015b), "Square FRP-HSC-steel composite columns: Behavior under axial compression", Eng. Struct., 92, 156-171. https://doi.org/10.1016/j.engstruct.2015.03.005.
  12. Ozbakkaloglu, T. (2015), "A novel FRP-dual-grade concrete-steel composite column system", Thin-Wall. Struct., 96, 295-306. https://doi.org/10.1016/j.tws.2015.08.016.
  13. Ozbakkaloglu, T. and Louk Fanggi, B.A. (2015), "FRP-HSC-steel composite columns: behavior under monotonic and cyclic axial compression", Mater. Struct., 48(4), 1075-1093. https://doi.org/10.1617/s11527-013-0216-0.
  14. Portoles, J.M., Serra, E. and Romero, M.L. (2013), "Influence of ultra-high strength infill in slender concrete-filled steel tubular columns", J. Constr. Steel Res., 86, 107-114. https://doi.org/10.1016/j.jcsr.2013.03.016.
  15. Shekastehband, B., Mohammadbagheri, S. and Taromi, A. (2018), "Seismic behavior of stiffened concrete-filled double-skin tubular columns", Steel Compos. Struct., 27(5), 577-598. https://doi.org/10.12989/scs.2018.27.5.577.
  16. Shi, C.J., Wu, Z.M., Xiao, J.F., Wang, D.H., Huang, Z.Y. and Fang, Z. (2015), "A review on ultra high performance concrete: Part I. Raw materials and mixture design", Constr. Build. Mater., 101, 741-751. https://doi.org/10.1016/j.conbuildmat.2015.10.088.
  17. Teng, J.G., Yu, T., Wong, Y.L. and Dong, S.L. (2007), "Hybrid FRP-concrete-steel tubular columns: Concept and behavior", Constr. Build. Mater., 21(4), 846-854. https://doi.org/10.1016/j.conbuildmat.2006.06.017.
  18. Wang, D.H., Shi, C.J., Wu, Z.M., Xiao, J.F., Huang, Z.Y. and Fang, Z. (2015a), "A review on ultra high performance concrete: Part II. Hydration, microstructure and properties", Constr. Build. Mater., 96, 368-377. https://doi.org/10.1016/j.conbuildmat.2015.08.095.
  19. Wang, J., Liu, W.Q., Zhou, D., Zhu, L. and Fang, H. (2014), "Mechanical behaviour of concrete filled double skin steel tubular stub columns confined by FRP under axial compression", Steel Compos. Struct., 17(4), 431-452. https://doi.org/10.12989/scs.2014.17.4.431.
  20. Wang, R., Han, L.H. and Tao, Z. (2015b), "Behavior of FRP-concrete-steel double skin tubular members under lateral impact: Experimental study", Thin-Wall. Struct., 95, 363-373. https://doi.org/10.1016/j.tws.2015.06.022.
  21. Wasiutynski, Z. and Brandt, A. (1963), "The present state of knowledge in the field optimum design of structures", Appl. Mech. Revs, 16(5), 341-350.
  22. Xia, H., Zhang, N. and Guo, W. (2018), Dynamic Interaction of Train-Bridge Systems in High-Speed Railways. Theory and Applications, Beijing Jiaotong University Press and Springer-Verlag GmbH Germany. https://doi.org/10.1007/978-3-662-54871-4
  23. Xiong, M.X., Xiong, D.X. and Liew, J. (2017), "Axial performance of short concrete filled steel tubes with high- and ultra-high- strength materials", Eng. Struct., 136, 494-510. https://doi.org/10.1016/j.engstruct.2017.01.037.
  24. Yu, T. and Teng, J.G. (2013), "Behavior of Hybrid FRP-Concrete-Steel Double-Skin Tubular Columns with a Square Outer Tube and a Circular Inner Tube Subjected to Axial Compression", J. Compos. Constr., 17(2), 271-279. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000331.
  25. Yu, T., Teng, J.G. and Wong, Y.L. (2010a), "Stress-Strain Behavior of Concrete in Hybrid FRP-Concrete-Steel Double-Skin Tubular Columns", J. Struct. Eng., 136(4), 379-389. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000121.
  26. Yu, T., Wong, Y.L. and Teng, J.G. (2010b), "Behavior of Hybrid FRP-Concrete-Steel Double-Skin Tubular Columns Subjected to Eccentric Compression", Adv. Struct. Eng., 13(5), 961-974. https://doi.org/10.1260/1369-4332.13.5.961.
  27. Yu, T., Zhang, S.S., Huang, L. and Chan, C. (2017), "Compressive behavior of hybrid double-skin tubular columns with a large rupture strain FRP tube", Compos. Struct., 171, 10-18. https://doi.org/10.1016/j.compstruct.2017.03.013.
  28. Zhang, Y. and Zhang, Z. (2016), "Study on equivalent confinement coefficient of composite CFST column based on unified theory", Mecha. Adv. Mater. Struct., 23(1), 22-27. https://doi.org/10.1080/15376494.2014.922650.
  29. Zohrevand, P. and Mirmiran, A. (2012), "Cyclic Behavior of Hybrid Columns Made of Ultra High Performance Concrete and Fiber Reinforced Polymers", J. Compos. Constr., 16(1), 91-99. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000234.