EXPERIMENTAL INVESTIGATION OF CFRP STRENGTHENED I-SHAPED COLD FORMED STEEL BEAMS
DOI:
https://doi.org/10.11113/jt.v79.10255Keywords:
Cold formed steel, built up beam, experimental, carbon fibre reinforced polymer, AISIAbstract
Cold formed steel differ from hot rolled steel by its lesser thickness and weight. The cold formed steel applicable in roof purlin, pipe racks and wall panels etc. Due its lesser wall thickness the cold formed steel member subjected to buckling. The enhancement of load carrying capacity of the cold formed steel member can be achieved by external strengthening of CFRP. In this study cold formed channel members connected back to back to form I shaped cross section using screws. These built up beam members were 300mm, 400mm and 500mm in length with 100mm screw spacing and edge distance of 50mm were chosen for testing. CFRP fabric cut according to length, width of built up beams and wrapped outer surface of beam using epoxy resin. Experiments were carried out in two sets firstly plain built up beams and secondly CFRP wrapped beams. The test results shows that increased load carrying capacity and reduction in deflection due to CFRP strengthening. Experimental results were compared with AISI standards which are in good agreement. Experimental results shows that CFRP strengthening is economic and reliable.
References
Macdonald, M., Heiyantuduwa, M.A. and Rhodes, J., 2008. Recent Developments In The Design Of Cold-Formed Steel Members And Structures. Thin-Walled Structures. 46(7): 1047-1053.
LaÃm, L., Rodrigues, J. P. C. and da Silva, L. S. 2013. Experimental And Numerical Analysis On The Structural Behaviour Of Cold-Formed Steel Beams. Thin-Walled Structures. 72: 1-13.
Yu W. 2010. Cold-Formed Steel Design. 4th ed. USA: John Wiley & Sons.
Silvestre, N., Young, B. and Camotim, D. 2008. Non-Linear Behaviour And Load-Carrying Capacity Of CFRP-Strengthened Lipped Channel Steel Columns. Engineering Structures. 30(10): 2613-2630.
Rondal, J. 2000. Cold Formed Steel Members And Structures: General Report. Journal Of Constructional Steel Research. 55(1): 155-158.
Teng, J. G., Yu, T. and Fernando, D. 2012. Strengthening Of Steel Structures With Fiber-Reinforced Polymer Composites. Journal of Constructional Steel Research. 78: 131-143.
Coifman, B., McCord, M., Mishalani, R. G., Iswalt, M., & Ji, Y. 2006. March. Roadway Traffic Monitoring from an Unmanned Aerial Vehicle. IEE Proceedings-Intelligent Transport Systems. 153(1): 11-20.
Haedir, J., Bambach, M. R., Zhao, X. L. and Grzebieta, R. H. 2009. Strength Of Circular Hollow Sections (CHS) Tubular Beams Externally Reinforced By Carbon FRP Sheets In Pure Bending. Thin-walled structures. 47(10): 1136-1147.
AISI (American Iron and Steel Institute). 2007. North American Specification for the Design of Cold-Formed Steel Structural Members. Iron and Steel Institute, Washington, DC.
Schafer, B. W. and Peköz, T. 1999. Laterally Braced Cold-Formed Steel Flexural Members With Edge Stiffened Flanges. Journal of Structural Engineering. 125(2): 118-127.
Haedir, J. and Zhao, X. L. 2011. Design Of Short CFRP-Reinforced Steel Tubular Columns. Journal of Constructional Steel Research. 67(3): 497-509.
Lee, Y. H., Lee, Y. L. and Tan, C. S. 2012. Experimental Investigation On Cold-Formed Steel Beams Under Pure Bending. Jurnal Teknologi. 58(1): 13-20.
Adeli, H. and Karim, A. 1997. Neural Network Model For Optimization Of Cold-Formed Steel Beams. Journal of Structural Engineering. 123(11): 1535-1543.
Yu, C. and Schafer, B. W. 2003. Local Buckling Tests On Cold-Formed Steel Beams. Journal of Structural Engineering. 129(12): 1596-1606.
Yu, C. and Schafer, B. W. 2007. Simulation Of Cold-Formed Steel Beams In Local And Distortional Buckling With Applications To The Direct Strength Method. Journal of Constructional Steel Research. 63(5): 581-590.
Santaputra, C., Parks, M. B. and Yu, W. W. 1989. Web Crippling Strength Of Cold-Formed Steel Beams. Journal of Structural Engineering. 115(10): 2511-2527.
Gotluru, B. P., Schafer, B. W. and Peköz, T. 2000. Torsion In Thin-Walled Cold-Formed Steel Beams. Thin-Walled Structures. 37(2): 127-145.
Ungureanu, V., Kotełko, M., Mania, R.J. and Dubina, D. 2010. Plastic Mechanisms Database For Thin-Walled Cold-Formed Steel Members In Compression And Bending. Thin-walled structures.48(10): 818-826.
Haidarali, M. R. and Nethercot, D. A. 2011. Finite Element Modelling Of Cold-Formed Steel Beams Under Local Buckling Or Combined Local/Distortional Buckling. Thin-Walled Structures. 49(12): 1554-1562.
Silvestre, N. and Camotim, D. 2003. Nonlinear Generalized Beam Theory For Cold-Formed Steel Members. International Journal of Structural Stability and Dynamics. 3(04): 461-490.
Kalavagunta, S., Naganathan, S. and Mustapha, K. N. B. 2013. Proposal For Design Rules Of Axially Loaded CFRP Strengthened Cold Formed Lipped Channel Steel Sections. Thin-Walled Structures. 72: 14-19.
ASTM Subcommittee D20. 10 on Mechanical Properties. 1996. Standard Test Method For Tensile Properties Of Plastics. American Society For Testing And Materials.
Downloads
Published
Issue
Section
License
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.
