DOI QR코드

DOI QR Code

An approach for partial strengthening of circular RC columns using outer steel tube

  • Hwang, Ju-young (Department of Civil Engineering, Dong-Eui University) ;
  • Kwak, Hyo-Gyoung (Department of Civil and Environmental Engineering, Korea Advanced Institute for Science and Technology)
  • 투고 : 2020.06.17
  • 심사 : 2021.01.28
  • 발행 : 2021.03.25

초록

This paper introduces an improved design equation to evaluate the resisting capacity of circular reinforced concrete (RC) columns partially strengthened with outer steel tube. When RC column members are required to be strengthened according to the change in the loadings considered and/or the deterioration progress in columns, wrapping up RC column with steel circular tube, which takes the form of concrete filled steel tube (CFST), has been popularly considered because of its structural advantage induced from the confinement effect. However, the relatively high construction cost of steel tube is restricting its use to the required region, while deriving the shape of a partial CFST column. To evaluate the resisting capacity of a partial CFST column, numerical analyses need to be performed, and a numerical model proposed in the previous study for the numerical analysis of full CFST columns is used to conduct parametric studies for the introduction of a design equation. The bond-slip effect developed along the interface between the in-filled concrete and the exterior steel tube is taken into consideration and the validity of the numerical model has been established through correlation studies between experimental data and numerical results for partial CFST circular columns. Moreover, parametric studies make it possible to introduce a design equation for determining the optimum length of outer steel tube which produces partial CFST circular columns.

키워드

참고문헌

  1. ABAQUS (2017), Abaqus Analysis User's Manual version 6.17., Dassault Systemes Simulia Corp.
  2. Al-Allaf, M.H.F., Weekes, L. and Augusthus Nelson, L. (2019), "Shear behaviour of lightweight concrete beams strengthened with CFRP composite", Mag. Concrete Res., 71(18), 949-964. https://doi.org/10.1680/jmacr.17.00488.
  3. American Association of State Highway and Transportation Officials (AASHTO) (2011), AASHTO Guide Specification for LRFD Seismic Bridge Design, Washington, D.C..
  4. American Institute of Steel Construction (AISC) (2010), Specifications for structural steel buildings, Chicago.
  5. Campione, G., Cavaleri, L., Di Trapani, F. and Ferrotto, M.F. (2017), "Frictional effects in structural behavior of no-end-connected steel-jacketed RC columns: experimental results and new approaches to model numerical and analytical response", J. Struct. Eng., 143(8), 04017070. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001796.
  6. Chou, C.C., Lee, C.S., Wu, K.Y. and Chin, V.L. (2018), "Development and validation of a FRP-wrapped spiral corrugated tube for seismic performance of circular concrete columns", Constr. Building Mater., 170, 498-511. https://doi.org/10.1016/j.conbuildmat.2018.03.047
  7. Eurocode 4 - European Committee for Standardisation (2004), EN 1994-1-1, Design of Composite Steel and Concrete Structures, Part 1.1 General Rules and Rules for Buildings, European Union.
  8. Goto, Y., Kumar, G.P. and Kawanishi, N. (2010), "Nonlinear Finite-Element Analysis for Hysteretic Behavior of Thin-Walled Circular Steel Columns with In-Filled Concrete", J. Struct. Eng. - ASCE, 136, 1413-1422. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000240.
  9. He, A., Cai, J., Chen, Q.J., Liu, X. and Xu, J. (2016), "Behaviour of steel-jacket retrofitted RC columns with preload effects", Thin-Wall. Struct., 109, 25-39. https://doi.org/10.1016/j.tws.2016.09.013.
  10. Hua, Y.X., Han, L.H. and Hou, C. (2019), "Behaviour of square CFST beam-columns under combined sustained load and corrosion: FEA modelling and analysis", J. Constr. Steel Res., 157, 245-259. https://doi.org/10.1016/j.jcsr.2019.01.027.
  11. Hwang, J.Y. and Kwak, H.G. (2018a), "FE analysis of circular CFT columns considering bond-slip effect: A numerical formulation", Mech. Sci., 9(2), 245-257. https://doi.org/10.5194/ms-9-245-2018.
  12. Hwang, J.Y. and Kwak, H.G. (2018b), "FE analysis of circular CFT columns considering bond-slip effect: Evaluation of ultimate strength", J. Constr. Steel Res., 145, 266-276. https://doi.org/10.1016/j.jcsr.2018.02.033.
  13. Kwak, H.G. and Kim, S.P. (2010), "Simplified monotonic moment-curvature relation considering fixed-end rotation and axial force effect", Eng. Struct., 32(1), 69-79. https://doi.org/10.1016/j.engstruct.2009.08.017.
  14. Kwon, S.H., Kim, Y.Y. and Kim, J.K. (2005), "Long-term behaviour under axial service loads of circular columns made from concrete filled steel tubes", Mag. Concrete Res., 57(2), 87-99. https://doi.org/10.1680/macr.2005.57.2.87.
  15. Lai, M.H. and Ho, J.C. (2016), "Confining and hoop stresses in ring-confined thin-walled concrete-filled steel tube columns", Mag. Concrete Res., 68(18), 916-935. https://doi.org/10.1680/jmacr.15.00225.
  16. Lee, Y.W., Seo, J., Kim, S., Kang, Y.J. and Won, D. (2018), "Cyclic Lateral Performance Evaluation of Precast Double-Skinned Composite Tubular Columns", Int. J. Steel Struct., 18(1), 97-113. https://doi.org/10.1007/s13296-018-0308-3.
  17. Ma, D.Y., Han, L.H., Li, W., Hou, C. and Mu, T.M. (2018), "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.
  18. Moon J. and Lee H.E. (2014), "Experimental evaluation of flexural behavior of partially embedded circular CFST pier-to-coping connection", J. Railway Conference 2014, 1387-1392.
  19. Pimanmas, A., Hussain, Q., Panyasirikhunawut, A. and Rattanapitikon, W. (2019), "Axial strength and deformability of concrete confined with natural fibre-reinforced polymers", Mag. Concrete Res., 71(2), 55-70. https://doi.org/10.1680/jmacr.17.00312.
  20. Ren, Q.X., Han, L.H., Hou, C., Tao, Z. and Li, S. (2017), "Concrete-encased CFST columns under combined compression and torsion: experimental investigation", J. Constr. Steel Res., 138, 729-741. https://doi.org/10.1016/j.jcsr.2017.08.016.
  21. Shen, Q., Wang, J., Wang, J. and Ding, Z. (2019), "Axial compressive performance of circular CFST columns partially wrapped by carbon FRP", J. Constr. Steel Res., 155, 90-106. https://doi.org/10.1016/j.jcsr.2018.12.017.
  22. Tian, T., Qiu, W.L. and Zhang, Z. (2018), "Behaviour of steel tube reinforced-concrete short bridge columns under cyclic loading", Mag. Concrete Res., 70(22), 1157-1174. https://doi.org/10.1680/jmacr.17.00332.
  23. Villar-Salinas, S., Guzman, A. and Carrillo, J. (2020), "Performance evaluation of structures with reinforced concrete columns retrofitted with steel jacketing", J. Build. Eng., 101510.
  24. Yin, X. and Lu, X. (2010), "Study on push-out test and bond stress-slip relationship of circular concrete filled steel tube", Steel Compos. Struct., 10(4), 317-329. https://doi.org/10.12989/scs.2010.10.4.317.
  25. Yu, T., Hu, Y.M. and Teng, J.G. (2016), "Cyclic lateral response of FRP-confined circular concrete-filled steel tubular columns", J. Constr. Steel Res., 124, 12-22. https://doi.org/10.1016/j.jcsr.2016.05.006.
  26. Zhou, X.H., Gan, D., Liu, J.P. and Chen, Y. F. (2018), "Composite effect of stub square steel tubed columns under axial compression", Adv. Steel Constr., 14(2), 274-290.