Predicting Moment Capacity of SCWSFBs—Novel Approach Part I: Analytically, Numerically and Design Model

Trapezoidal corrugated web beams (CWB) have been the subject of extensive research. However, there is a noticeable gap in the literature concerning the determination of moment resistance in slender corrugated web beams with slender flanges (SCWSF). Previous studies, both experimental and numerical, have shown that the SCWSF bending resistance model outlined in EN1993-1-5 (Eurocode 3: Design of steel structures—Part 1-5: Plated structural elements, CEN, 2007) often leads to unsafe resistance predictions. This study investigates the moment capacity of SCWSF using a combination of theoretical, numerical, and experimental approaches. A numerical and analytical investigation is being conducted in the current part to analyze the moment resistance of SCWSF beams. Based on previous results from the experimental studies of SCWSF, a novel formulation has been developed to align with the failure modes and guidelines outlined in ANSI/AISC 360-16 (Specification for Structural Steel Buildings, Chicago, 2016) for the design of steel I sections to resist flexural strength. A new methodology has been developed to assess the moment resistance of SCWSF, considering factors such as flange slenderness, the ratio of flange width to beam height, and various loading conditions. This approach builds upon existing proposals for flat and corrugated web girders, incorporating numerical findings for further validation. The results suggest that all models demonstrate a conservative nature and lack accuracy across the full range of SCWSF beams. The recommended approach offers more accurate estimations compared to existing standards and proposed designs.