In this article, three hot-rolled steel combined short columns and a pure steel short column under eccentric load were tested. The failure modes and load–displacement curves of the specimens under eccentric load were reported. A finite element model was developed and validated against the experimental results, and good agreement was achieved in terms of failure modes, bearing capacity and load–displacement curves. Upon validation, a series of finite element models were employed for the parameter analysis over the parameter of concrete strength (30–120 MPa) and steel strength (235–420 MPa). The finite element parameters analysis results showed that the steel strength has limited effect on the reduction coefficient (1 +η) of the ultimate bearing capacity of specimens, whereas the reduction coefficient (1 +η) of the ultimate bearing capacity of specimens decreases gradually as concrete strength increases. Based on the finite element parameter analysis results, the N–M correlation curve and a simplified design method for the reduction coefficient (1 +η) of the ultimate bearing capacity of hot-rolled steel combined short columns under eccentric load are proposed. Good agreement is achieved between the design method and finite element analysis results, and the prediction of the design method is accurate and consistent.

中文翻译：

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偏心荷载作用下热轧钢组合短柱承载力研究

本文对三根热轧钢组合短柱和一根纯钢短柱进行偏心载荷试验。报告了偏心载荷下试件的破坏模式和载荷位移曲线。开发了一个有限元模型并根据实验结果进行了验证，并且在失效模式、承载能力和载荷-位移曲线方面取得了良好的一致性。经验证，采用一系列有限元模型对混凝土强度（30-120 MPa）和钢筋强度（235-420 MPa）参数进行参数分析。有限元参数分析结果表明，钢材强度对试件极限承载力折减系数(1+η)的影响有限，而试件极限承载力折减系数（1+η）随着混凝土强度的增加而逐渐减小。基于有限元参数分析结果，提出了偏心荷载作用下热轧钢组合短柱极限承载力折减系数(1+η)的N-M相关曲线和简化设计方法。设计方法与有限元分析结果吻合较好，设计方法预测准确一致。提出了偏心荷载作用下热轧钢组合短柱极限承载力折减系数(1+η)的N-M相关曲线和简化设计方法。设计方法与有限元分析结果吻合较好，设计方法预测准确一致。提出了偏心荷载作用下热轧钢组合短柱极限承载力折减系数(1+η)的N-M相关曲线和简化设计方法。设计方法与有限元分析结果吻合较好，设计方法预测准确一致。