Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Modeling of slender RC columns strengthened by steel angles and strips

  • Shallan, Osman (Department of Structural Engineering, University of Zagazig) ;
  • Sakr, Thrwat (Department of Structural Engineering, University of Zagazig) ;
  • Khater, Mahmoud (Department of Structural Engineering, University of Zagazig) ;
  • Ismail, Ahmed (Department of Structural Engineering, University of Zagazig)
  • Received : 2020.03.22
  • Accepted : 2021.09.16
  • Published : 2021.10.25
⟨ Previous Next ⟩

Abstract

This paper presents a numerical model to simulate the behavior of the slender RC column strengthened by a steel jacket using angles and strips. The proposed strengthening technique has been verified using experimental results of slender column tests performed by previous research. Both load-deformation relationships and failure modes are investigated. The results of the numerical models are in good agreement with the values from the experimental work used in verification. The results also show that the strengthening technique using steel angles and strips is effective for increasing the ultimate load of the slender column by up to 50% and also increases column stiffness and ductility. It's found that the capacity of the strengthened column increases with steel angles and strips sizes and decreases with increasing slenderness ratio (λ).

Keywords

References

  1. Aykac, S., Kalkan, I., Aykac, B., Karahan, S. and Kayar, S. (2013), "Strengthening and repair of reinforced concrete beams using external steel plates", J. Struct. Eng., 139(6), 929-939. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000714.
  2. Campione, G. (2012), "Strength and ductility of RC columns strengthened with steel angles and battens", Constr. Build. Mater., 35, 800-807. https://doi.org/10.1016/j.conbuildmat.2012.04.090.
  3. Eshghi, S. and Zanjanizadeh, V. (2008), "Retrofit of slender square reinforced concrete columns with glass fiber-reinforced polymer for seismic resistance", Iran. J. Sci. Tech., 32, 437-450.
  4. Fouche, P., Bruneau, M. and Chiarito, V.P. (2016), "Modified steel-jacketed columns for combined blast and seismic retrofit of existing bridge columns", J. Bridge Eng., 21(7), 04016035. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000882.
  5. Gajdosova, K. and Bilcik, J. (2013), "Full-scale testing of CFRP-strengthened slender reinforced concrete columns", J. Compos. Constr., 17(2), 239-248. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000329.
  6. Garzon-Roca, J., Ruiz-Pinilla, J., Adam, J.M. and Calderon, P.A. (2011), "An experimental study on steel-caged RC columns subjected to axial force and bending moment", Eng. Struct., 33(2), 580-590. https://doi.org/10.1016/j.engstruct.2010.11.016.
  7. 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.
  8. He, A., Cai, J., Chen, Q.J., Liu, X., Xue, H. and Yu, C. (2017), "Axial compressive behaviour of steel-jacket retrofitted RC columns with recycled aggregate concrete", Constr. Build. Mater., 141, 501-516. https://doi.org/10.1016/j.conbuildmat.2017.03.013.
  9. Hung, C.C. and Hu, F.Y. (2018), "Behavior of high-strength concrete slender columns strengthened with steel fibers under concentric axial loading", Constr. Build. Mater., 175, 422-433. https://doi.org/10.1016/j.conbuildmat.2018.04.201.
  10. Huang, Y., Xiao, J. and Zhang, C. (2012), "Theoretical study on mechanical behavior of steel confined recycled aggregate concrete", J. Constr. Steel Res., 76, 100-111. https://doi.org/10.1016/j.jcsr.2012.03.020.
  11. Jiang, T. and Teng, J.G. (2012), "Theoretical model for slender FRP-confined circular RC columns", Constr. Build. Mater., 32, 66-76. https://doi.org/10.1016/j.conbuildmat.2010.11.109.
  12. Li, W., Liang, H., Lu, Y., Xue, J. and Liu, Z. (2019), "Axial behavior of slender RC square columns strengthened with circular steel tube and sandwiched concrete jackets", Eng. Struct., 179, 423-437. https://doi.org/10.1016/j.engstruct.2018.11.018.
  13. Lu, Y.Y., Liang, H.J., Li, S. and Li, N. (2015), "Axial behavior of RC columns strengthened with SCC filled square steel tubes", Steel Compos. Struct., 18(3), 623-639. https://doi.org/10.12989/scs.2015.18.3.623.
  14. Makki, R.F. and Nimnim, S.T. (2015) "Rehabilitation of structural columns by using steel angles", Int. J. Sci. Eng. Res., 1(6), 981-987.
  15. Montuori, R. and Piluso, V. (2009), "Reinforced concrete columns strengthened with angles and battens subjected to eccentric load", Eng. Struct., 31(2), 539-550. https://doi.org/10.1016/j.engstruct.2008.10.005.
  16. Nimnim, H.T. and Al-Bahadli, H.A. (2018), "Structural behavior of slender high-strength RC columns strengthened by steel angles", Pract. Period. Struct. Des. Constr., 23(4), 04018026. https://doi.org/10.1061/(ASCE)SC.1943-5576.0000393.
  17. Rodrigues, E.A., Manzoli, O.L., Bitencourt Jr, L.A., dos Prazeres, P.G. and Bittencourt, T.N. (2015), "Failure behavior modeling of slender reinforced concrete columns subjected to eccentric load", Latin Am. J. Solid. Struct., 12(3), 520-541. https://doi.org/10.1590/1679-78251224.
  18. Sadeghian, P. and Fam, A. (2015), "Strengthening slender reinforced concrete columns using high-modulus bonded longitudinal reinforcement for buckling control", J. Struct. Eng., 141(4), 04014127. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001066.
  19. Su, R.K.L. and Wang, L. (2012), "Axial strengthening of preloaded rectangular concrete columns by precambered steel plates", Eng. Struct., 38, 42-52. https://doi.org/10.1016/j.engstruct.2012.01.003.
  20. Tarabia, A.M. and Albakry, H.F. (2014), "Strengthening of RC columns by steel angles and strips", Alex. Eng. J., 53(3), 615-626. https://doi.org/10.1016/j.aej.2014.04.005.
  21. Wang, M.H. (2011), "Experimental study on axial-compression reinforced concrete column strengthened by circular steel tube", Appl. Mech. Mater., 94, 1261-1270. https://doi.org/10.4028/www.scientific.net/AMM.94-96.1261.
  22. Zadeh, V.Z. and Eshghi, S. (2018), "Nonlinear finite element modeling of gfrp-strengthened slender rectangular RC columns with confinement deficiency in plastic hinge zone", Jordan J. Civil Eng., 12(2).