Steel and Composite Structures

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Efficient cross-sectional profiling of built up CFS beams for improved flexural performance

  • Dar, M. Adil (Department of Civil Engineering, Indian Institute of Technology Delhi) ;
  • Subramanian, N. ;
  • Atif, Mir (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Dar, A.R. (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Anbarasu, M. (Department of Civil Engineering, Government College of Engineering Salem) ;
  • Lim, James B.P. (Department of Civil & Environmental Engineering, University of Auckland)
  • Received : 2019.03.28
  • Accepted : 2019.12.20
  • Published : 2020.02.25
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Abstract

In the past, many efficient profiles have been developed for cold-formed steel (CFS) members by judicious intermediate stiffening of the cross-sections, and they have shown improved structural performance over conventional CFS sections. Most of this research work was based on numerical modelling, thus lacking any experimental evidence of the efficiency of these sections. To fulfill this requirement, experimental studies were conducted in this study, on efficient intermediately stiffened CFS sections in flexure, which will result in easy and simple fabrication. Two series of built-up sections, open sections (OS) and box sections (BS), were fabricated and tested under four-point loading with same cross-sectional area. Test strengths, modes of failure, deformed shapes, load vs. mid-span displacements and geometric imperfections were measured and reported. The design strengths were quantified using North American Standards and Indian Standards for cold-formed steel structures. This study confirmed that efficient profiling of CFS sections can improve both the strength and stiffness performance by up to 90%. Closed sections showed better strength performance whereas open sections showed better stiffness performance.

Keywords

References

  1. Dar, M.A., Sahoo, D.R. and Jain, A.K. (2019a), "Axial compression behavior of laced cold-formed steel built-up columns with unstiffened angle sections", J. Constr. Steel Res., 162, DOI: 10.1016/j.jcsr.2019.105727.
  2. Dar, M.A., Subramanian, N., Dar, A.R., Anbarasu, M., Lim, J.B. and Mir, A. (2019b), "Behaviour of partly stiffened cold-formed steel built-up beams:Experimental investigation and numerical validation", Adv. Struct. Eng., 22(1), 172-186. https://doi.org/10.1177/1369433218782767.
  3. Dar, M.A., Subramanian, N., Dar, A.R., Majid, M., Haseeb, M. and Tahoor, M. (2019c), "Structural efficiency of various strengthening schemes for cold-formed steel beams: Effect of global imperfections", Steel Compos. Struct., 30(4), 393-403. https://doi.org/10.12989/scs.2019.30.4.393.
  4. Dar, M.A., Subramanian, N., Rather, A.I., Dar, A., Lim, J.B.P., Anbarasu, M. and Roy, K. (2019d), "Effect of angle stiffeners on the flexural strength and stiffness of cold-formed steel beams", Steel Compos. Struct., 33(2), 225-243. https://doi.org/10.12989/scs.2019.33.2.225.
  5. Dar, M.A., Subramanian, N., Dar, D.A., Dar, A.R., Anbarasu, M., Lim, J.B. and Mahajoubi, S. (2020), "Flexural strength of cold-formed steel built-up composite beams with rectangular compression flanges", Steel Compos. Struct., 34(2), 171-188. https://doi.org/10.12989/scs.2020.34.2.171.
  6. Dar M.A., Sahoo D.R., Pulikkal S. and Jain A.K. (2018a), "Behavior of laced built-up cold-formed steel columns: Experimental investigation and numerical validation", Thin-Wall. Struct., 132, 398-409. https://doi.org/10.1016/j.tws.2018.09.012.
  7. Dar, M. A., Subramanian, N., Dar, A.R., Anbarasu, M. and Lim, J.B.P. (2018b), "Structural performance of cold-formed steel composite beams", Steel Compos. Struct., 27(5), 545-554. https://doi.org/10.12989/scs.2018.27.5.545.
  8. Dar, M.A., Subramanian, N., Dar, A.R. and Raju, J. (2017), "Rehabilitation of a distressed steel roof truss - A study", Struct. Eng. Mech., 62(5), 567-576. https://doi.org/10.12989/sem.2017.62.5.567.
  9. Dar, M.A., Dar, A.R., Yusuf, M. and Raju, J. (2015a), "Experimental study on innovative cold-formed steel beams", Steel Compos. Struct., 19(6), 1599-1610. https://doi.org/10.12989/scs.2015.19.6.1599.
  10. Dar, M.A., Subramanian, N., Anbarasu, M., Dar, A.R. and Raju, J. (2015b), "Experimental investigations on the structural behaviour of a distressed bridge", Struct. Eng. Mech., 56(4), 695-705. https://doi.org/10.12989/sem.2015.56.4.695.
  11. Grenda M. and Paczos P. (2019), "Experimental and numerical study of local stability of non-standard thin-walled channel beams", J. Theor. Appl. Mech., 57(3), 549-562. DOI 10.15632/jtam-pl/109601.
  12. Hancock, G. (2016), "Cold-formed steel structures: Research review 2013-2014", Adv. Struct. Eng., 19(3), 393-408. https://doi.org/10.1177/1369433216630145.
  13. Hot rolled medium and high tensile structural steel - specification. (2011), New Delhi: Bureau of Indian Standards.
  14. Indian Standard- Metallic Testing-Tensile Testing at Ambient Temperature. (2005, May), New Delhi 110002: Bureau of Indian Standards.
  15. IS 801-Code of Practice for use of cold formed light gauge steel structural members in general building construction. (1975), New Delhi: Bureau of Indian Standards.
  16. Kumar, N. and Sahoo, D.R. (2016), "Optimization of lip length and aspect ratio of thin channel sections under minor axes bending", Thin-Wall. Struct., 100, 158-169. https://doi.org/10.1016/j.tws.2015.12.015.
  17. Laim, L., Rodrigues, J.P.C. and daSilva, L. (2013), "Experimental and numerical analysis on the structural behaviour of cold-formed steel beams", Thin-Wall. Struct., 72, 1-13. https://doi.org/10.1016/j.tws.2013.06.008.
  18. Magnucki, K. and Paczos, P. (2009), "Theoretical shape optimization of cold-formed thin-walled channel beams with drop flanges in pure bending", J. Constr. Steel Res., 65, 1731-1737. https://doi.org/10.1016/j.jcsr.2009.03.010.
  19. Magnucki, K., Paczos, P. and Kasprzak, J. (2010), "Elastic buckling of cold-formed thin-walled channel beams with drop flanges",: J. Struct. Eng. - ASCE, 136(7), 886-896. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000184.
  20. Manikandan, P., Sukumar, S. and Balaji, T. (2014), "Effective shaping of cold-formed thin-walled built-up beams in pure bending", Arabian J. Sci. Eng., 39, 6043-6054. https://doi.org/10.1007/s13369-014-1261-x.
  21. North American Specification for the design of cold formed steel Structural members. (2016), Americal Iron and Steel Institute.
  22. Obst, M., Rodak, M. and Paczos, P. (2016), "Limit load of cold formed thin-walled nonstandard channel beams", J. Theor. App. Mech., 54(4), 1369-1377. https://doi.org/10.15632/jtam-pl.54.4.1369
  23. Paczos, P. and Wasilewicz, P. (2009), "Experimental investigations of buckling of lipped, cold-formed thin-walled beams with I - section", Thin-Wall. Struct., 47(11), 1354-1362. https://doi.org/10.1016/j.tws.2009.03.009.
  24. Schafer, B. (2006), "Designing cold-formed steel using the direct strength method", Proceedings of the 18th International Specialty Conference on Cold-Formed Steel Structures. Orlando, Florida.
  25. Schafer, B. (2008), "Review: The Direct Strength Method of cold-formed steel member design", J. Constr. Steel Res., 64, 766-778. https://doi.org/10.1016/j.jcsr.2008.01.022
  26. Schafer, B.W. (2011), "Cold-formed steel structures around the world - A review of recent advances in applications, analysis and design", Steel Constr., 4(3) 141-149. https://doi.org/10.1002/stco.201110019.
  27. SudhirSastry, Y.B., Krishna, Y. and Budarapu Pattabhi, R. (2015), "Parametric studies on buckling of thin walled channel beams", Comput. Mater. Sci., 96, 416-424. https://doi.org/10.1016/j.commatsci.2014.07.058.
  28. Trahair, N.S. and Papangelis, J.P. (2018), "Lateral-distortional buckling of beams with hollow flanges and folded plate webs". Eng. Struct., 163, 71-76. ttps://doi.org/10.1016/j.engstruct.2018.02.001.
  29. Wang, L. and Young, B. (2014), "Design of cold-formed steel channels with stiffened webs subjected to bending", Thin-Wall. Struct., 85, 81-92. https://doi.org/10.1016/j.tws.2014.08.002.
  30. Ye, J., Becquea, J., Hajirasoulihaa, I., Mohammad Mojtabaeia, S. and Lim, J.B.P. (2018), "Development of optimum cold-formed steel sections for maximum energy dissipation in uniaxial bending", Eng. Struct., 161, 55-67. https://doi.org/10.1016/j.engstruct.2018.01.070.
  31. Ye, J., Hajirasouliha, I., Becque, J. and Pilakoutas, K. (2016), "Development of more efficient cold-formed steel channel sections in bending", Thin-Wall. Struct., 101, 1-13. https://doi.org/10.1016/j.tws.2015.12.021.
  32. Yu, C. and Schafer, B. (2006), "Distortional Buckling tests on cold-formed steel beams", J. Struct. Eng., 132(4), 515-528. https://doi.org/10.1061/(ASCE)0733-9445(2006)132:4(515).
  33. Yu, J., Becquea, J., Hajirasoulihaa, I., Mojtabaei, S.M. and Lim, J.B.P. (2018), "Development of optimum cold-formed steel sections for maximum energy dissipation in uniaxial bending", Eng. Struct., 161, 55-67. https://doi.org/10.1016/j.engstruct.2018.01.070

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