The cross-section classification is an important topic in flexural steel member design since it tackles a cross-section's susceptibility to local buckling and specifies design resistance. As a result, work focuses on determining the classification limits for various classes of open web steel beams. A comprehensive investigation considering theoretical analysis, experimentation, and data analysis to assess the impact of a solitary point load applied at the beam's midpoint. Based on findings of the different studies, a total of eighty-eight nonlinear finite element models were examined using the ABAQUS software programme. The different finite element models are distinguished by their local slenderness ratios. Most of the steel design regulations consider the influence of the “individual plate rule”, “restricted load pattern rule”, and “monotonic rule” for cross section classification and neglect the effect of interactive behaviour. From the literature, it is found that classification should be done at the member level rather than at the cross-sectional level. To address this issue, open web steel beams were classified using the box section as a base. The classification limits for distinct classes of open web steel beams were derived at the member level, taking into account the interaction of different failure modes and local buckling modes. This suggestion is based on the effects of local and local-to-overall interaction buckling modes, which are not explicitly addressed by current design rules. Based on existing research and statistical assessment of test data, the current study provides suitable classification limits and rotation capacity formulations for open web steel beams.

横截面分类是弯曲钢构件设计中的一个重要主题，因为它解决了横截面对局部屈曲的敏感性并指定了设计阻力。因此，工作重点是确定各类开腹钢梁的分类限制。考虑理论分析、实验和数据分析的综合研究，以评估施加在梁中点的孤立点载荷的影响。根据不同研究的结果，使用 ABAQUS 软件程序检查了总共 88 个非线性有限元模型。不同的有限元模型通过其局部长细比来区分。大多数钢材设计规范考虑了“单板规则”、“限制荷载模式规则”和“单调规则”对截面分类的影响，而忽略了相互作用行为的影响。从文献中发现，分类应该在成员层面而不是横截面层面进行。为了解决这个问题，使用箱形截面作为基础对开腹钢梁进行分类。考虑到不同失效模式和局部屈曲模式的相互作用，在构件级别推导了不同类别开腹钢梁的分类限制。该建议基于局部和局部到整体相互作用屈曲模式的影响，当前的设计规则没有明确解决这些问题。基于现有研究和试验数据的统计评估，本研究为开腹钢梁提供了合适的分类极限和旋转能力公式。