ABSTRACT A novel precast composite column with L-shape steels and infilled reinforced concrete (LSRC) is proposed and assessed by experimental research and numerical simulation. The LSRC column is constructed with four L-shape steels placing at corners, a reinforced cage placing outside and the casted concrete. The L-shape steels are connected by batten plates and the reinforcement cage is made up of longitudinal bars, hoops, and two-way ties. In this paper, 3 LSRC slender columns and a conventional concrete-filled steel tube column with encased concrete (CFTEC) are tested and compared to investigate their failure modes, flexural strength, and strains of concrete and steel at mid-span. The results show that the LSRC column has more sufficient plastic deformation ability and steel utilization than the CFTEC column, and exhibits the typical flexural failure mode. Furthermore, the 3D finite element model is also established to analyze the contribution of components, interaction mechanism between steel angle and concrete, and the effect of different factors on flexural behavior of LSRC columns. Based on the test and numerical results, the formula for calculating the bending capacity of LSRC column is proposed, and the predicted results agree well with the experimental and numerical values.

中文翻译：

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新型带钢角钢组合柱抗弯性能研究

摘要提出了一种新型的 L 型钢和填充钢筋混凝土 (LSRC) 预制组合柱，并通过实验研究和数值模拟进行了评估。LSRC 柱由四根放置在拐角处的 L 型钢、一个放置在外面的钢筋笼和浇筑的混凝土构成。L型钢由板条板连接，钢筋笼由纵筋、箍筋和双向拉杆组成。在本文中，对 3 根 LSRC 细长柱和一根带有包裹混凝土的传统钢管混凝土柱 (CFTEC) 进行了测试和比较，以研究它们的破坏模式、抗弯强度以及混凝土和钢筋在跨中的应变。结果表明，LSRC柱比CFTEC柱具有更充分的塑性变形能力和钢材利用率，并表现出典型的弯曲破坏模式。此外，还建立了3D有限元模型，分析了构件的贡献、角钢与混凝土的相互作用机制，以及不同因素对LSRC柱抗弯性能的影响。根据试验和数值结果，提出了LSRC柱抗弯承载力的计算公式，预测结果与试验值和数值吻合较好。