The behavior of Tilted RC Beams Under Biaxial Shear and Torsion: A Finite Element Approach

In recent years, there has been an urgent need to find unconventional solutions to meet the architectural requirements in designs to produce larger spaces using relatively small or proportionate sections that do not negatively affect the aesthetic appearance of the design. From this standpoint, research and study were conducted on inclined beams and the difference between them and regular beams, studying their behavior and capacity and whether the American ACI code specifications apply to them or require a unique code. This research is based on analyzing the behavior of beams under the influence of biaxial shear forces and torsional moments by designing three groups of models to compare them with regular beam models and compare their behavior and the amount of their resistance to loads. Three methods of analysis were used to apply a load; the first method was to apply biaxial shear force, which had eccentricity from the shear center on a notch at the mid-section of the tilted beam to cause biaxial shear and torsion on the longitudinal span. The second method applied pure torsion on the mid-span of the tilted beam, and the third method used a lever system at the mid-span of the tilted beam to cause biaxial shear and torsion. The results of the analysis help to understand the behavior of tilted beams under torsion and the differences between them and the standard beams.