The Influence of the Non-dimensional Slenderness Ratio on the Flexural Strength of Beams

This paper mainly deals with the effect of the non-dimensional slenderness ratio (λlt) on a member's ability to flexural behavior, which was studied numerically using a wide range of built-up I-sections. Axial, bending, shear, and torsional stresses are frequently present during a complicated loading condition that is applied to thin-walled frame parts with extremely narrow open cross-sections and poor torsional stiffness. As a result, they frequently experience instability even before reaching their production capacity. One of the most common types of lateral torsional buckling (LTB) is a prevalent instability phenomenon related to thin-walled constructions. The results are drawn to the conclusion that the design methodology was decided Instead of section classification, the non-dimensional slenderness ratio (λlt) determines the type of failure. The design procedure for the flexural design strength of the member, when the λlt ≤ 0.4 the yield stress governs the flexural design strength, it denotes that the component can form plastic hinges and has the necessary rotational strength for the structure to fail due to the development of plastic mechanism. When the λlt > 0.4 then the flexural torsional buckling strength governs the design bending strength, which means the member can’t develop plastic hinges and the member failed before the process of the plastic mechanism’s creation. As a part of the research, we are focusing on how the non-dimensional slenderness ratio affects the flexural capacity of a member. It was observed that even though the section was under the plastic section and compact section, the member failed before reaching its yield stress.