DOI QR코드

DOI QR Code

Axial loading tests and load capacity prediction of slender SHS stub columns strengthened with carbon fiber reinforced polymers

  • Park, Jai-Woo (Gayoon Construction. Co. Ltd.) ;
  • Yoo, Jung-Han (School of Architecture, Seoul National University of Science & Technology)
  • 투고 : 2012.08.27
  • 심사 : 2013.06.04
  • 발행 : 2013.08.25

초록

This paper presents the experimental results of axially loaded stub columns of slender steel hollow square section (SHS) strengthened with carbon fiber reinforced polymers (CFRP) sheets. 9 specimens were fabricated and the main parameters were: width-thickness ratio (b/t), the number of CFRP ply, and the CFRP sheet orientation. From the tests, it was observed that two sides would typically buckle outward and the other two sides would buckle inward. A maximum increase of 33% was achieved in axial-load capacity when 3 layers of CFRP were used to wrap HSS columns of b/t = 100 transversely. Also, stiffness and ductility index (DI) were compared between un-retrofitted specimens and retrofitted specimens. Finally, it was shown that the application of CFRP to slender sections delays local buckling and subsequently results in significant increases in elastic buckling stress. In the last section, a prediction formula of the ultimate strength developed using the experimental results is presented.

키워드

참고문헌

  1. AISC (2005), Steel Construction Manual, Vol. 2, (13th Ed.) American Institute of Steel Construction.
  2. AISI Standard (2001), Supplement to the North American Specification for the Design of Cold-Formed Steel Structural Members, American Iron and Steel Institute.
  3. Akesson, B. (2007), Plate Buckling in Bridges and Other Structures, Taylor & Francis, UK, 14-17.
  4. El-Tawil, S., Ekiz, E., Goel, S. and Chao, S.H. (2011), "Retraining local and global buckling behavior of steel plastic hinges using CFRP", J. Construct. Steel Res., 67(3), 261-269. https://doi.org/10.1016/j.jcsr.2010.11.007
  5. Fam, A., Macfougall, C. and Shaat, A. (2009), "Upgrading steel-concrete composite girders and repair of damaged steel Beams using bonded CFRP laminates", Thin-Walled. Struct., 47(10), 1122-1135. https://doi.org/10.1016/j.tws.2008.10.014
  6. Harries, K.A., Peck, A.J. and Abraham, E.J. (2009), "Enhancing stability of structural steel sections using FRP", Thin-Walled. Struct., 47(10), 1092-1101. https://doi.org/10.1016/j.tws.2008.10.007
  7. Hu, Y.M. (2010), "Behavior and modeling of FRP confined hollow and concrete-filled steel tubular columns", Ph.D. Thesis, Hong Kong Polytechnic University, 35.
  8. Miller, T.C., Chajes, M.J., Mertz, D.R. and Hastings, J.N. (2001), "Strengthening of a steel bridge girder using CFRP plates", ASCE, J. Bridge. Eng., 6(6), 514-522. https://doi.org/10.1061/(ASCE)1084-0702(2001)6:6(514)
  9. Narmashri, K., Jumaat, M.Z. and Sulong, N.H.R. (2010), "Shear strengthening of steel I-beams by using CFRP strips", Scientif. Res. Essays., 5(16), 2155-2168.
  10. Sallam, H.E.M., Badawy, A.A.M., Saba, A.M. and Mikhail, F.A. (2010), "Flexural behavior of strengthened steel-concrete composite beams by various plating methods", J. Const. Steel Res., 66(8-9), 1081-1087. https://doi.org/10.1016/j.jcsr.2010.03.005
  11. Schneider, S.P. (1998), "Axially loaded concrete-filled steel tubes", ASCE, J. Struct. Eng., 124(10), 1125-1138. https://doi.org/10.1061/(ASCE)0733-9445(1998)124:10(1125)
  12. Shaat, A. and Fam, A.Z. (2006), "Axial loading tests on short and long hollow structural steel columns retrofitted using carbon fibre reinforced polymers", Can. J. Civil Eng., 33(4), 458-470. https://doi.org/10.1139/l05-042
  13. Shaat, A. and Fam, A.Z. (2009), "Slender steel columns strengthened using high-modulus CFRP plates for buckling control", ASCE, J. Compos. Const., 13(1), 2-12. https://doi.org/10.1061/(ASCE)1090-0268(2009)13:1(2)
  14. Tao, Z., Han, L.H. and Zhung, J.P. (2007), "Axial Load Behavior of CFRP Strengthened Concrete-Filled Steel Tubular Stub Columns", Adv. Struct. Eng., 10(1), 37-46. https://doi.org/10.1260/136943307780150814
  15. Teng, J.G. and Hu, Y.M. (2007), "Behavior of FRP-Jacked Circular Steel Tubes and Cylindrical Shells under Axial Compression", Const. Build. Mater., 21(4), 827-838. https://doi.org/10.1016/j.conbuildmat.2006.06.016

피인용 문헌

  1. Experimental investigation of reinforced concrete columns retrofitted with polyester sheet vol.6, pp.3, 2014, https://doi.org/10.12989/eas.2014.6.3.237
  2. Finite element and micromechanical modeling for investigating effective material properties of polymer–matrix nanocomposites with microfiber, reinforced by CNT arrays vol.8, pp.3, 2016, https://doi.org/10.1007/s40091-016-0132-y
  3. CFRP strengthening of steel columns subjected to eccentric compression loading vol.23, pp.1, 2013, https://doi.org/10.12989/scs.2017.23.1.087
  4. Experimental and numerical investigation of strengthened deficient steel SHS columns under axial compressive loads vol.67, pp.2, 2013, https://doi.org/10.12989/sem.2018.67.2.207
  5. Direct strength method for high strength steel welded section columns vol.29, pp.4, 2013, https://doi.org/10.12989/scs.2018.29.4.509
  6. Strengthening of deficient steel SHS columns under axial compressive loads using CFRP vol.30, pp.1, 2013, https://doi.org/10.12989/scs.2019.30.1.069
  7. Investigating loading rate and fibre densities influence on SRG - concrete bond behaviour vol.34, pp.6, 2020, https://doi.org/10.12989/scs.2020.34.6.877