Abstract
Modern buildings utilize steel-castellated beams to support extensions and reduce dead weight. However, the presence of castellations weakens the structure and creates additional failure mechanisms. Corrugations and castellations were combined in this study to strengthen the web. Using the ABAQUS software, a circular castellated-triangular corrugated steel beam with a perforated casing was modeled and analyzed. Triangular corrugations with corrugation angles of 30° and 45° and circular castellations with S/D ratios of 0, 1.1, 1.5 and 2 were used. The beam sections had a span of 2000 mm, depth of 300 mm, flange width of 150 mm, flange thickness of 16 mm and web thickness of 5 mm. The ultimate load of the beam assembly was determined using GMNIA on a simply supported beam with mid-point loading. A study on a flat web beam with the same dimensions and S/D ratios was conducted to understand and compare the behavior of the new corrugated–castellated assembly with and without casing. 22 configurations in the proposed castellated-corrugated assemblage, including a plain web, were modeled and analyzed. The results show that, compared with castellations in plain web beams, more than 60% of the load-carrying capacity was observed on a 30° corrugated-castellated beam with a casing assembly. In addition, the mass-to-capacity ratio of the same beam was higher.
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