In this study, the effect of the steel core orientation to combined stresses behavior of a concrete encased steel (CES) composite column was studied. The various sectional configurations were used to define contributions to capacity under compression and flexural loading. CES composite sections were generally designed as column to resist axial compression and biaxial bending. This study would provide better understanding in case the section should carry flexural bending beside axial compression. The samples were tested under constant axial and repeated transverse forces, and a finite element analysis (FEA) model was developed to express flexural behavior of the composite column and to verify the experimental study. A total of four concrete encased steel composite columns with differently oriented I-shaped and circular tube steel sections and a reinforced concrete column were tested. Behavior of the columns were evaluated regarding failure modes, load versus displacement relationships and ultimate strength. Experimental results indicated that the specimen with steel section oriented regarding tension region exhibited better flexural response.

在这项研究中，研究了钢芯方向对混凝土包裹钢 (CES) 复合柱组合应力行为的影响。各种截面配置用于定义在压缩和弯曲载荷下对容量的贡献。CES 复合材料截面通常设计为柱以抵抗轴向压缩和双轴弯曲。这项研究将提供更好的理解，以防该部分除轴向压缩外还应承受弯曲弯曲。样品在恒定轴向力和重复横向力下进行测试，并开发了有限元分析 (FEA) 模型来表达复合柱的弯曲行为并验证实验研究。总共测试了四个具有不同方向的工字形和圆管钢截面的混凝土包裹钢组合柱和一个钢筋混凝土柱。柱的行为就破坏模式、载荷与位移关系和极限强度进行了评估。实验结果表明，钢截面在受拉区取向的试件表现出更好的弯曲响应。