Design method of HSS welded H-section beams subjected to bending-shear combination

• Published in: Journal of constructional steel research 2023-12, Vol.211, p.108201, Article 108201
• Main Authors: Zhou, Yi, Ning, Shuncheng, Gao, Jiaxin, Peng, Ruilingfeng, Li, Yinglei
• Format: Article
• Language: English
• Subjects: Bending-shear combination; High-strength steel; Shear buckling coefficient; Ultimate bearing capacity; Welded H-section beams
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2023.108201

High-strength steel (HSS) welded H-section beams are increasingly used in steel structures considering their advantage of high strength, but the stability is a concern especially near the supports, where the beams are prone to buckling under the combined actions of bending and shear. In this paper, finite element method was used to analyze the mechanical performance of HSS welded H-section beams under shear and bending-shear loads. A parametrical analysis for the H-section beams under pure shear loads was conducted, and a new shear buckling coefficient calculation method considering the interaction between plates was proposed. This coefficient was then applied to calculate the shear strength, and a design method for shear buckling strength based on the direct strength method (DSM) was proposed. Finally, a new bending-shear interaction curve was developed to predict the ultimate resistance of HSS welded H-section beams under bending-shear combination, and the reliability analysis results demonstrate the feasibility and safety of the design method proposed in this paper for HSS welded H-section beams. [Display omitted] •Calculation method for elastic shear buckling coefficient of H-section beams under shear.•The Direct Strength Method for high strength steel (HSS) welded H-section beams under shear.•A new bending-shear interaction curve for HSS welded H-section beams under bending-shear combination.•Reliability analysis of the new design proposals.