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Steel and Composite Structures Volume 42, Number 4, February25 2022 , pages 447-458 DOI: https://doi.org/10.12989/scs.2022.42.4.447 |
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Stiffening schemes for CFS built-up I-beams with large global imperfections: Capacity and behaviour |
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M. Adil Dar, M. Anbarasu, A.R. Dar, Naqeeb Ul Islam, Ahmad Fayeq Ghowsi and Hermes Carvalho
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Abstract | ||
Cold-formed steel (CFS) sections are thin-walled, therefore, more susceptible to different types of geometric imperfections. Global type of geometric imperfections has a significant impact on the load-carrying capacity of flexural members. This paper reports an experimental study that discusses the influence of global imperfections on the flexural response of CFS built-up I-beams composed of two lipped channels, with simply supported ends, under four-point loading. Global imperfections of magnitude over eight times the maximum permissible ones were induced in the specimens, leading to their distress. Using various simple stiffening schemes, the capacity and stiffness of the distressed specimens were improvised. The performance comparisons were made based on the maximum loads resisted, flexural stiffnesses offered, and failure modes experienced by the specimens. As experimental data on such distressed specimens are currently lacking in the literature, the test results of the present study will provide the necessary data needed by future researchers to numerically extend this study further, which will help in the development of necessary design guidelines for the same. The stiffening schemes significantly improved the structural efficiency of distressed specimens in terms of strength and stiffness, by over 60%. As a result, an effective and time-saving solution to such realistic structural engineering problems is given. | ||
Key Words | ||
beam; built-up; cold-formed steel; experiment; global imperfection; strength | ||
Address | ||
M. Adil Dar:Department of Civil and Environmental Engineering, National University of Singapore, Singapore M. Anbarasu:Department of Civil Engineering, Government College of Engineering Salem, Tamil Nadu, India A.R. Dar:Department of Civil and Environmental Engineering, National University of Singapore, Singapore Naqeeb Ul Islam:Department of Civil Engineering, National Institute of Technology Srinagar, J&K, India Ahmad Fayeq Ghowsi:Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India Hermes Carvalho:Department of Structural Engineering, Federal University of Minas Gerais, Brazil | ||