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Residual Stresses: Measurements and Their Influence on the Ultimate Shear Strength of Hybrid I-Sections

Nayak, N.; Subramanian, L.

Lecture Notes in Civil Engineering 543 LNCE: 421-428

2025

ISSN/ISBN: 2366-2557
DOI: 10.1007/978-981-97-6067-1_41
Accession: 102413392

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Summary
Residual stresses are known to affect beam flexural strengths and column compression strengths when they are of intermediate lengths, which are susceptible to both yielding and member buckling. The spectrum of research data available for the influence of residual stresses on inelastic shear strengths has yet to be widely disseminated. Residual stresses caused by welding or hot-rolling of steel cross-sections are implicitly considered in design strength equations via empirical factors. These factors are based on idealised patterns and magnitudes in literature, which not only have a wide scatter but are also largely outdated and overly conservative. Since residual stresses ensue from the fabrication process of cutting and welding, the adoption of any advanced fabrication technology necessitates the accurate measurement of these locked-in stresses. This paper discusses the measurement of residual stresses and their influence on the ultimate shear strength of welded I-sections. The residual stresses are measured through a semi-destructive blind-hole drilling method. These measurements are made on slender-web hybrid mono-symmetric welded I-sections. The I-sections are fabricated from plates cut using CNC-laser cutting technology from hot-rolled sheets. CO2 MIG welding is used in welding the flange and web plates.

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