Experimental and Theoretical Analysis of Hollow Steel Columns Strengthening by CFRP

Amir Hamzeh Keykha, Masoud Nekooei, Reza Rahgozar




Abstract


The need for strengthening and retrofitting is well known and extensive research is progressing in this field. The reasons for strengthening and retrofitting are numerous: increased loads, changes in use, deterioration, and so on. In recent years, the use of carbon fiber reinforced polymer (CFRP) for strengthening has shown to be a competitive method, both regarding structural performance, and economical aspects. Extensive research has been carried out in this field. However, most of the research has been undertaken on concrete structures and for confinement, flexural, and shear strengthening. Limited research has been carried out on steel structures strengthened with CFRP. This paper presents axially loaded steel columns strengthened for increased load. The topic is studied theoretically and through laboratory tests. The theory covers analytical methods. Carbon fiber reinforced polymers has been used to strengthen the columns. The tests have been undertaken on full scale specimens, non-strengthened for reference, partially strengthened and fully strengthened


Keywords


CFRP; experimental; strengthened; steel column; theoretical analysis

References


  1. Finch, W.W., Chajes, M.J., Mertz, D.R., Kalia¬kin, V.N., and Faqiri, A., Bridge Rehabilitation using Composite Materials, Infrastructure: New Materials and Methods of Repair, Proc. Mate¬rials Engineering Conference, American Society of Civil Engineers, New York, NY, 1994, pp. 1140-1147.
  2. Demer, M. and Neale, K.W., Confinement of Reinforced Concrete Columns with Fibre Reinforced Composite Sheets, An Experimental Study, Canadian Journal of Civil Engineering, 26(2), 1999, pp. 226–241.[CrossRef]
  3. Hollaway, L., In Polymer Composites for Civil and Structural Engineering, 1st ed., Blackie Academic and Professional, Glasgow, 1993.[CrossRef]
  4. Zhao, X.L, Fernando, D., and Mahaidi, R.A., CFRP Strengthened RHS Subjected to Transverse End Bearing Force, Engineering Struc¬tures, 28, 2006, pp. 1555–1565.
  5. Silvestre, N., Young, B., and Camotim, D., Non-Linear Behavior and Load Carrying Capacity of CFRP Strengthened Lipped Channel Steel Columns, Engineering Structures, 30, 2008, pp. 2613–2630.[CrossRef]
  6. Teng, J.G. and Hu, Y.M., Behavior of FRP Jacketed Circular Steel Tubes and Cylindrical Shells under Compression, Journal of Construction and Building Material, 21, 2007, pp. 827–838.[CrossRef]
  7. Jiao, H. and Zhao, X.L., CFRP Strengthened Butt-Welded Very High Strength (VHS) Circular Steel Tubes, Thin-Walled Structures, 42(7), 2004, pp. 963–978.[CrossRef]
  8. Shaat, A. and Fam, A., Axial Loading Tests on CFRP-Retrofitted Short and Long HSS Steel Columns, Canadian Journal of Civil Engineering, 33(4), 2006, pp. 458–470.[CrossRef]
  9. Shaat, A. and Fam, A., Modeling of Axially Loaded HSS Slender Steel Columns Strengthened with CFRP Sheets, International Conference on Advances in Engineering Structures, Mechanics and Construction, 2006.[CrossRef]
  10. Zhao, Y.H, Gu, W., Xu, J., and Zhang, H.T., The Strength of Concrete-Filled CFRP Steel Tubes under Axial Compression, ISOPE Conference, JSC-313, 2005.
  11. Tao, Z., Han, L.H, and Zhuang, J.P., Experimental Behavior of CFRP Strengthened Concrete Filled Steel Tubular Stub Columns, Advances in Structures Engineering, 63, 2006, pp. 1116–1126.
  12. Kinoshita, K., Analyses of Steel Bridge Circular Columns using Fiber Model considering Local Buckling, Civil Engineering Dimension, 16(1), 2014, pp. 1-7.
  13. Bambach, M.R, Jama, H.H, and Elchalakani, M., Effect of Externally Bonded CFRP on The Local Buckling and Axial Capacity of Steel SHS, Fifth International Conference on Coupled Instabilities in Metal Structures, Sydney, Aus¬tralia, 2008, pp. 23–25.
  14. Gao, X.Y, Balendra, T., and Koh, C.G., Buckling Strength of Slender Circular Tubular Steel Braces Strengthened by CFRP, Engineering Structures, 46, 2013, pp. 547-556.[CrossRef]
  15. Sundarraja, M.C. and Sivasankar, S., Experimental Investigation on FRP Confined HSS Tubular Members under Compression, Journal of Structural Engineering, 40, 2013, pp. 298-304.
  16. Sundarraja, M.C. and Ganesh Prabhu, G., Experimental Study on CFST Members Strengthened by CFRP Composites under Compression, Journal of Constructional Steel Research, 72, 2012, pp. 75-83.[CrossRef]
  17. Chen, W.F. and Lui, E.M., Structural Stability. Elsevier Science Publishing Co., Inc., 1987


Full Text: PDF

Instructions for Preparing Papers for CED.docx
The Journal is published by The Institute of Research & Community Outreach - Petra Christian University.

©All right reserved 2016.Civil Engineering Dimension, ISSN: 1410-9530, e-ISSN: 1979-570X

 

View My Stats


Copyright © Research Center Web-Dev Team