DOI QR코드

DOI QR Code

Axial behavior of CFRP wrapped RC columns of different shapes with constant slenderness ratio

  • Narule, Giridhar N. (Department of Structural Engineering, Veermata Jijabai Technological Institute) ;
  • Bambole, Abhay N. (Department of Structural Engineering, Veermata Jijabai Technological Institute)
  • 투고 : 2017.05.19
  • 심사 : 2018.01.10
  • 발행 : 2018.03.25

초록

In composite materials technology, the fiber-reinforced polymers (FRP) have opened up new horizons in infrastructural engineering field for strengthening existing structures and components of structure. The Carbon fiber reinforced polymer (CFRP) sheets are well suited for RC columns to this application because of their high strength to weight ratio, good fatigue properties and excellent resistance to corrosion. The main focus of present experimental work is to investigate effect of shapes on axial behavior of CFRP wrapped RC columns having same cross-sectional area and slenderness ratio. The CFRP volumetric ratio and percentage of steel are also adopted constant for all the test specimens. A total of 18 RC columns with slenderness ratio four were cast. Nine columns were control and the rest of nine columns were strengthened with one layer of CFRP wrap having 35 mm of corner radius. Columns confined with CFRP wrap were designed using IS: 456:2000 and ACI 440.2R.08 provisions. All the test specimens were loaded for axial compression up to failure and failure pattern for each shaped column was investigated. All the experimental results were compared with analytical values calculated as per the ACI-440.2R-08 code. The test results clearly demonstrated that the axial behavior of CFRP confined RC columns is affected with the change in shapes. The axial deformation is higher in CFRP wrapped RC circular column as compared to square and rectangular columns. Stress-strain behaviour revealed that the yield strength gained from CFRP confinement was significant for circular columns as compare to square and rectangular columns. This behaviour may be credited due to effect of shape on lateral deformation in case of CFRP wrapped circular columns at effective confinement action.

키워드

과제정보

연구 과제 주관 기관 : All India Council for Technical Education (AICTE)

참고문헌

  1. (ACI) 440.2R, (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, Farmington Hills, MI, U.S.A.
  2. Amir, M. (1998), "Effect of column parameters on FRP confined concrete", J. Compos. Constr., 2(4), 175-185. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:4(175)
  3. Benzaid, R., Chikh, N. and Mesbah, H. (2008), "Behavior of square concrete column confined with GFRP composite warp", J. Civil Eng. Manage., 14(2), 115-120. https://doi.org/10.3846/1392-3730.2008.14.6
  4. Chaallal, O.M., Shahawy, M. and Adnan, A.S. (2000), "Behavior of axially loaded short rectangular columns strengthened with CFRP composite wrapping", Technical report, FDOT Structures Research center, E. Paul Dirac Drive Tallahassee, FL 32310.
  5. Chikh, N., Gahmous, M. and Benzaid, R. (2012), "Structural performance of high strength concrete columns confined with CFRP sheets", Proceedings of World Congress on Engineering, London, U.K.
  6. Esfahani, R. and Kianosh, M.R. (2005), "Axial compressive strength of reinforced concrete columns wrapped with fiber reinforced polymers (FRP)", IJE Trans. B: Appl., 18(1), 9-19.
  7. IS 456 (2000), Plain and Reinforced Concrete-Code of Practice, Bureau of Indian Standards, India.
  8. Kabashi, N., Krasniqi, C. and Nushi, V. (2014), "Analysis and behaviour the concrete columns strengthening with the carbon polymer fibres", Civil Eng. Archit., 2(9), 317-322.
  9. Mirmiran, A. and Shahawy, M. (1997), "Behavior of concrete columns confined by fiber composites", J. Struct. Eng., 123(5), 583-590. https://doi.org/10.1061/(ASCE)0733-9445(1997)123:5(583)
  10. Ozbakkaloglu, T. and Lim, J.C. (2013), "Axial compressive behavior of FRP-confined concrete: Experimental test database and a new design-oriented model", Compos. Part B: Eng., 55, 607-634. https://doi.org/10.1016/j.compositesb.2013.07.025
  11. Pessiki, S., Harries, K., Kestner, J., Sause, R. and Ricles, J. (2001), "Axial behavior of reinforced concrete columns confined with FRP jackets", J. Compos. Constr., 5(4), 237-245. https://doi.org/10.1061/(ASCE)1090-0268(2001)5:4(237)
  12. Pham, T.M., Doan, L.V. and Hadi, M.N.S. (2011), "Strengthening square reinforced concrete columns by circularisation and FRP confinement", Constr. Build. Mater., 49, 490-499.
  13. Rahai, A.R., Sadeghian, P. and Ehsani, M.R. (2008), "Experimental behavior of concrete cylinder confined with CFRP composites", Proceedings of the 14th World Conference on Earthquake Engineering, China.
  14. Sadeghian, P. and Fam, A. (2014), "Rational approach toward strain efficiency factor of fiber reinforced polymer wrapped concrete columns", ACI Struct. J., 113-S13,135-144.
  15. Sezen, H. and Miller, E.A. (2011), "Experimental evaluation of axial behavior of strengthened circular reinforced-concrete columns", J. Brid. Eng., 16(2), 238-247. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000143
  16. Siddiqui, N.A., Alsayed, S.H., AlSalloum, Y.A., Iqbal, R.A. and Abba, H. (2014), "Experimental investigation of slender circular RC columns strengthened with FRP composites", Constr. Build. Mater., 69, 323-334.
  17. Song, X., Gu, X., Li, Y., Chen, T. and Zhang, W. (2013), "Mechanical behavior of FRP-strengthened concrete columns subjected to concentric and eccentric compression loading," J. Compos. Constr., 17(3), 336-346. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000351
  18. Toutanji, H.A., Meng, H. and Matthys, S. (2007), "Axial load behavior of rectangular concrete columns confined with FRP composites", FRPRCS-8 University of Patras, Greece.
  19. Widiarsa, I.B. and Hadi, M.N. (2013), "Performance of CFRP wrap square reinforced concrete column subjected to eccentric loading", Proc. Eng., 54, 365-376. https://doi.org/10.1016/j.proeng.2013.03.033
  20. Xiao, Y. and Wu, H. (2008), "Compressive behavior of concrete confined by carbon fiber composite jackets", J. Mater. Civil Eng., 12(2), 139-146. https://doi.org/10.1061/(ASCE)0899-1561(2000)12:2(139)

피인용 문헌

  1. Axial strengthening of RC columns by direct fastening of steel plates vol.77, pp.6, 2018, https://doi.org/10.12989/sem.2021.77.6.705