DOI QR코드

DOI QR Code

Residual bond behavior of high strength concrete-filled square steel tube after elevated temperatures

  • Chen, Zongping (College of Civil Engineering and Architecture, Guangxi University) ;
  • Liu, Xiang (College of Civil Engineering and Architecture, Guangxi University) ;
  • Zhou, Wenxiang (College of Civil Engineering and Architecture, Guangxi University)
  • 투고 : 2017.01.16
  • 심사 : 2018.03.24
  • 발행 : 2018.05.25

초록

This paper presents experimental results on the residual bond-slip behavior of high strength concrete-filled square steel tube (HSCFST) after elevated temperatures. Three parameters were considered in this test: (a) temperature (i.e., $20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$, $800^{\circ}C$); (b) concrete strength (i.e., C60, C70, C80); (c) anchorage length (i.e., 250 mm, 400 mm). A total of 17 HSCFST specimens were designed for push-out test after elevated temperatures. The load-slip curves at the loading end and free end were obtained, in addition, the distribution of steel tube strain and the bond stress along the anchorage length were analyzed. Test results show that the shape of load-slip curves at loading ends and free ends are similar. With the temperature constantly increasing, the bond strength of HSCFST increases first and then decreases; furthermore, the bond strength of HSCFCT proportionally increases with the anchoring length growing. Additionally, the higher the temperature is, the smaller and lower the bond damage develops. The energy dissipation capacity enhances with the concrete strength rasing, while, decreases with the temperature growing. What is more, the strain and stress of steel tubes are exponentially distributed, and decrease from the free end to loading end. According to experimental findings, constitutive formula of the bond slip of HSCFST experienced elevated temperatures is proposed, which fills well with test data.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. AIJ (1997), Recommendations for design and construction of concrete filled steel tubular structure; Architectural Institute of Japan, Tokyo, Japan.
  2. Aslani, F., Uy, B. and Tao, Z. (2015), "Predicting the axial load capacity of high-strength concrete filled steel tubular columns", Steel Compos. Struct., Int. J., 19(4), 967-993. https://doi.org/10.12989/scs.2015.19.4.967
  3. BS 540025 (2005), Steel concrete and composite bridges: Part 5: Code of Practice for the Design of Composite Bridges; British Standard Institute, London, Britain.
  4. BS EN 1994-1-1 (2004), Eurocode 4: Design of composite steel and concrete structures: Part1.1, General rules and rules for buildings; British Standards Institution, London, Britain.
  5. Chiang, C.H. and Tsai, C.L. (2003), "Time-temperature analysis of bond strength of a rebar after fire exposure", J. Cement Concrete Res., 33(10), 1651-1654. https://doi.org/10.1016/S0008-8846(03)00139-X
  6. Dong, C.X., Kwan, A.K.H. and Ho, J.C.M. (2015), "A constitutive model for predicting the lateral strain of confined concrete", Eng. Struct., 91, 155-166. https://doi.org/10.1016/j.engstruct.2015.02.014
  7. El-Hawary, M.M. and Hamoush, S.A. (1996), "Bond shear modulus of reinforced concrete at high temperatures", Eng. Fract. Mech., 55(6), 991-999. https://doi.org/10.1016/S0013-7944(96)00049-5
  8. Guler, S., Copur, A. and Aydogan, M. (2014), "A comparative study on square and circular high strength concrete-filled steel tube columns", Adv. Steel Constr., 10(2), 234-247.
  9. Haddad, R.H. and Shannis, L.G. (2004), "Post-fire behavior of bond between high strength pozzolanic concrete and reinforcing steel", Constr. Build. Mater., 18(6), 425-435. https://doi.org/10.1016/j.conbuildmat.2004.03.006
  10. Kwan, A.K.H., Dong, C.X. and Ho, J.C.M. (2015), "Axial and lateral stress-strain model for FRP confined concrete", Eng. Struct., 99, 285-295. https://doi.org/10.1016/j.engstruct.2015.04.046
  11. Lai, M.H. and Ho, J.C.M. (2014), "Experimental and theoretical studies of confined HSCFST columns under uni-axial compression", Earthq. Struct., Int. J., 7(4), 527-552. https://doi.org/10.12989/eas.2014.7.4.527
  12. Ma, Y.S. and Wang, Y.F. (2012), "Creep of high strength concrete filled steel tube columns", Thin-Wall. Struct., 53(2), 91-98. https://doi.org/10.1016/j.tws.2011.12.012
  13. Moliner, V., Espinos, A. and Romero, M.L. (2013), "Fire behavior of eccentrically loaded slender high strength concrete-filled tubular columns", J. Constr. Steel Res., 83, 137-146. https://doi.org/10.1016/j.jcsr.2013.01.011
  14. Patel, V.I., Liang, Q.Q. and Hadi, M.N.S. (2014), "Numerical analysis of high-strength concrete-filled steel tubular slender beam-columns under cyclic loading", J. Constr. Steel Res., 92(1), 183-194. https://doi.org/10.1016/j.jcsr.2013.09.008
  15. Qu, X., Chen, Z. and Nethercot, D.A. (2014), "Push-out tests and bond strength of rectangular CFST columns", Steel Compos. Struct., Int. J., 19(1), 21-41.
  16. Romero, M.L., Espinos, A. and Portoles, J.M. (2015), "Slender double-tube ultra-high strength concrete-filled tubular columns under ambient temperature and fire", Eng. Struct., 99, 536-545. https://doi.org/10.1016/j.engstruct.2015.05.026
  17. Schaumann, P., Kodur, V. and Bahr, O. (2009), "Fire behaviour of hollow structural section steel columns filled with high strength concrete", J. Constr. Steel Constr., 65(8-9), 1794-1802. https://doi.org/10.1016/j.jcsr.2009.04.013
  18. Schaumann, P and Kleibomer, I. (2017), "Experimental and numerical investigations of the composite behaviour in concrete-filled tubular columns with massive steel core at high temperatures", J. Struct. Fire Eng., 9(2), 147-160.
  19. Shakir-Khalil, H. (1993), "Push out strength of concrete-filled steel hollow sections", Struct. Engr., 71, 230-233.
  20. Song, T.Y., Tao, Z. and Han, L.H. (2017), "Bond behavior of concrete-filled steel tubes at elevated temperatures", J. Struct. Eng., 143(11), 04017147 https://doi.org/10.1061/(ASCE)ST.1943-541X.0001890
  21. Su, Q.T., Yang, G.T. and Bradford, M.A. (2014), "Static behaviour of multi-row stud shear connectors in high- strength concrete", Steel Compos. Struct., Int. J., 17(6), 967-980. https://doi.org/10.12989/scs.2014.17.6.967
  22. Tao, Z., Han, L.H. and Uy, B. (2011), "Post-fire bond between the steel tube and concrete in concrete-filled steel tubular columns", J. Constr. Steel Res., 67(3), 484-496. https://doi.org/10.1016/j.jcsr.2010.09.006
  23. Tao, Z., Song, T.Y. and Uy, B. (2016), "Bond behavior in concretefilled steel tubes", J. Constr. Steel Res., 120, 81-93. https://doi.org/10.1016/j.jcsr.2015.12.030
  24. Wang, Y.B. and Liew, J.Y.R. (2016), "Constitutive model for confined ultra-high strength concrete in steel tube", Constr. Build. Mater., 126, 812-822. https://doi.org/10.1016/j.conbuildmat.2016.09.079
  25. Xiong, M.X. and Liew, J.Y.R. (2016), "Mechanical behavior of ultra-high strength concrete at elevated temperatures and fire resistance of ultra-high strength concrete filled steel tubes", Mater. Des., 104, 414-427. https://doi.org/10.1016/j.matdes.2016.05.050
  26. Xu, C., Huang, C.K. and Jiang, D.C. (2009), "Push-out test of prestressing concrete filled circular steel tube columns by means of expansive cement", Constr. Build. Mater., 23(1), 491-497. https://doi.org/10.1016/j.conbuildmat.2007.10.021
  27. Xu, J.J., Chen, Z.P. and Xue, J.Y. (2013), "Failure mechanism of interface bond behavior between circular steel tube and recycled aggregate concrete by push-out test", J. Build. Struct., 34(7), 148-156. [In Chinese]
  28. Yang, Z., Li, G. and Lang, Y. (2017), "Flexural behavior of high strength concrete filled square steel tube with inner CFRP circular tube", Ksce J. Civil Eng., 21(7), 2728-2737. https://doi.org/10.1007/s12205-017-0579-9

피인용 문헌

  1. Residual Bond Behavior of Steel Reinforced Recycled Aggregate Concrete After Exposure to Elevated Temperatures vol.7, pp.None, 2018, https://doi.org/10.3389/fmats.2020.00142
  2. Residual Properties and Axial Bearing Capacity of Steel Reinforced Recycled Aggregate Concrete Column Exposed to Elevated Temperatures vol.7, pp.None, 2018, https://doi.org/10.3389/fmats.2020.00187
  3. Experimental and numerical investigation on post-earthquake fire behaviour of the circular concrete-filled steel tube columns vol.38, pp.1, 2018, https://doi.org/10.12989/scs.2021.38.1.017