Steel and Composite Structures

  • 제30권4호
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  • Pages.393-403
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  • 2019
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Structural efficiency of various strengthening schemes for cold-formed steel beams: Effect of global imperfections

  • Dar, M. Adil (Department of Civil Engineering, Indian Institute Technology Delhi) ;
  • Subramanian, N. (Consulting Engineer) ;
  • Dar, A.R. (Department of Civil Engineering, National Institute Technology Srinagar) ;
  • Majid, Muheeb (Department of Civil Engineering, National Institute Technology Srinagar) ;
  • Haseeb, Mohd (Department of Civil Engineering, National Institute Technology Srinagar) ;
  • Tahoor, Mugees (Department of Civil Engineering, National Institute Technology Srinagar)
  • 투고 : 2018.10.22
  • 심사 : 2019.02.25
  • 발행 : 2019.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Cold-formed steel (CFS) has a great potential to meet the global challenge of fast-track and durable construction. CFS members undergo large buckling instabilities due to their small wall thickness. CFS beams with corrugated webs have shown great resistance towards web buckling under flexure, when compared to the conventional I-sections. However, the magnitude of global imperfections significantly affects the performance of CFS members. This paper presents the first attempt made to experimentally study the effect of global imperfections on the structural efficiency of various strengthening schemes implemented in CFS beams with corrugated webs. Different strengthening schemes were adopted for two types of beams, one with large global imperfections and the other with small imperfections. Strength and stiffness characteristics of the beams were used to evaluate the structural efficiency of the various strengthening schemes adopted. Six tests were performed with simply supported end conditions, under four-point loading conditions. The load vs. mid-span displacement response, failure loads and modes of failure of the test specimens were investigated. The test results would compensate the lack of experimental data in this area of research and would help in developing numerical models for extensive studies for the development of necessary guidelines on the same. Strengthening schemes assisted in enhancing the member performance significantly, both in terms of strength and stiffness. Hence, providing an economic and time saving solution to such practical structural engineering problems.

키워드

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피인용 문헌

  1. Flexural Strength of cold-formed steel built-up composite beams with rectangular compression flanges vol.34, pp.2, 2019, https://doi.org/10.12989/scs.2020.34.2.171
  2. Efficient cross-sectional profiling of built up CFS beams for improved flexural performance vol.34, pp.3, 2019, https://doi.org/10.12989/scs.2020.34.3.333
  3. An innovative technique of anchoring lacing bars with CFS sections for shear strengthening of RC beams vol.7, pp.1, 2019, https://doi.org/10.1007/s41062-021-00722-7