The current European Standard (EN 1994-1-1: Eurocode 4) put forth a reduction factor for Solid Composite Beam (SCB) with Class 1 and 2 sections for the design moment of resistance for sagging bending. This paper presents the analytical study on the behavior of Cellular Composite Beam (CCB) and proposes the reduction factor for the ultimate moment capacity of CCB sections. A moment-curvature program based on the strain compatibility method has been developed and used to examine the behavior of CCB made of S355, S460, and hybrid strength steel sections with different geometries. The program involves elastoplastic analysis since it is crucial to explore how the cellularity of the composite sections increases their curvature ductility, flexural resistance, and material utilization under high strain. The developed program has been validated against FE results, available test data, and ACB+ software solutions. A parametric study has been carried out to determine the effect of steel grade, concrete grade, effective width and depth of the slab, and varying sizes of a web opening on CCB sections. The Eurocode 4 design guidelines were used to determine the bending resistance of CCB for S355, S460, and hybrid-strength steel sections. The parametric study showed that high-strength concrete with a wider effective slab and enhanced depth sections with the lowest web opening causes CCB sections to have a higher ultimate moment and ultimate curvature. Comparing the hybrid CCB section to the regular and high-strength sections also showcases a significant enhancement in ductility and moment capacity.

现行欧洲标准（EN 1994-1-1：欧洲规范 4）提出了 1 级和 2 级截面实心复合梁 (SCB) 下垂弯曲设计抗弯矩的折减系数。本文对蜂窝复合梁 (CCB) 的性能进行了分析研究，并提出了 CCB 截面极限弯矩承载力的折减系数。基于应变协调方法的弯矩-曲率程序已经开发出来，并用于检查由 S355、S460 和不同几何形状的混合强度钢型材制成的 CCB 的性能。该程序涉及弹塑性分析，因为探索复合材料截面的细胞结构如何提高其曲率延展性、抗弯性和高应变下的材料利用率至关重要。开发的程序已根据 FE 结果、可用测试数据和 ACB+ 软件解决方案进行了验证。我们进行了参数研究，以确定钢材等级、混凝土等级、板的有效宽度和深度以及腹板开口的不同尺寸对 CCB 截面的影响。欧洲规范 4 设计指南用于确定 S355、S460 和混合强度钢型材的 CCB 的抗弯强度。参数研究表明，高强混凝土具有更宽的有效板和具有最低腹板开口的增强深度截面，导致CCB截面具有更高的极限弯矩和极限曲率。将混合 CCB 型材与常规型材和高强度型材进行比较，还显示出延展性和弯矩能力的显着增强。