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Steel and Composite Structures Volume 55, Number 4, May 25 2025 , pages 319-332 DOI: https://doi.org/10.12989/scs.2025.55.4.319 |
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Flexural behaviour of hybrid high-strength steel I-beams |
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Keshav Saini, Ricky Lalthazuala and Tekcham G. Singh
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| Abstract | ||
| This paper presents a comprehensive numerical investigation into the flexural behaviour of hybrid high-strength steel (HSS) I-beams subjected to major axis bending. Initially, finite element (FE) models were developed and validated against available experimental results for welded homogeneous and hybrid HSS I-beams, employing a methodology consistent with prior research. These validated FE models were subsequently employed for parametric studies, covering a broad range of cross sectional slenderness for hybrid HSS I-beams. The results from FE models reveal that, to meet rotation capacity requirements, more stringent Class 1 slenderness limits for both the outstand flange in compression and the internal web in bending are necessary. Further, slenderness limits are proposed to facilitate plastic design of hybrid HSS sections under bending. Furthermore, comparisons between Class 2 and Class 3 slenderness limits and the codified European standards, revealed inadequacies for hybrid HSS beams. Consequently, new limits are recommended for classifying various cross-sections. Additionally, the applicability of the design equations in Eurocode (EN 1993-1-1), Direct Strength Method (DSM), and Continuous Strength Method (CSM) for hybrid HSS I-beams has been assessed, demonstrating increased variability. Hence, modified DSM and CSM formulations specifically tailored for hybrid HSS I-beams are proposed. The proposed equations are found to provide conservative and reliable predictions, thus recommended for inclusion in design standards. | ||
| Key Words | ||
| continuous strength method; direct strength method; flexural strength; four-points bending; hybrid HSS I beams; slenderness limit | ||
| Address | ||
| Keshav Saini:Department of Civil and Infrastructure Engineering, Indian Institute of Technology Jodhpur, India, Jodhpur - 342030 Ricky Lalthazuala:Department of Civil Engineering, National Institute of Technology Mizoram, India, Mizoram – 796012 Tekcham G. Singh:Department of Civil and Infrastructure Engineering, Indian Institute of Technology Jodhpur, India, Jodhpur - 342030 | ||