石包混凝土方钢管桩柱的轴向抗压行为

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2024-11-14 DOI:10.1016/j.jcsr.2024.109134

Yang Liu , Jie Liu , Xiaojuan Liu , Chaozhong Zhang

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引用次数: 0

摘要

通过在混凝土填充钢管（CFST）柱的空腔中插入废弃的石棱柱，提出了一种新型的石棱柱包裹混凝土填充钢管（SCFST）柱，以有效提高 CFST 柱的轴向抗压承载能力并节约建筑资源。对 9 根方形 SCFST 存根柱和 3 根方形 CFST 存根柱进行了轴向抗压试验。试验结果表明，SCFST 柱的主要破坏模式是钢管向外局部屈曲以及填充混凝土和石材棱柱的破碎。与 CFST 柱相比，相同配钢比的 SCFST 柱的轴向抗压承载能力提高了 3.8% 至 29.1%。小尺寸石棱柱（β ≤ 0.14）并不能显著提高 SCFST 柱的轴向抗压承载能力。根据试验结果，建立了 SCFST 柱轴向受压的有限元（FE）模型，并进行了 FE 参数扩展分析。此外，根据 SCFST 柱的试验和 FE 结果，进一步揭示了方形钢管对填充混凝土和石材棱柱的约束机制。据此，提出了计算 SCFST 方形柱轴向抗压承载力的简化方法，计算结果与试验和 FE 结果更加吻合，与根据现行设计规范预测的结果相比更加准确。

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Axial compressive behavior of stone encased concrete-filled square steel tube stub columns

A novel type of stone prism encased concrete-filled steel tube (SCFST) column is proposed by inserting waste stone prisms into the cavity of a concrete-filled steel tube (CFST) column to effectively enhance the axial compressive loading capacity of CFST columns and save construction resources. Axial compressive tests were conducted on 9 square SCFST stub columns and 3 square CFST stub columns. Test results show that the outward local buckling of the steel tube and the crushing of the infilled concrete and stone prism is the primary failure mode of SCFST columns. Compared with the CFST column, the axial compressive loading-carrying capacity of SCFST columns with the same steel ratio increased by 3.8 % to 29.1 %. A small-sized stone prism (β ≤ 0.14) does not significantly improve the axial compressive loading–carrying capacity of SCFST columns. Based on the test results, the finite element (FE) model of the SCFST column under axial compression is established, and the FE parameter expansion analysis is carried out. Furthermore, the confinement mechanism of the square steel tube on the infilled concrete and stone prism is further revealed based on both test and FE results of SCFST columns. Accordingly, a simplified approach to calculate the axial compressive loading–carrying capacity of square SCFST columns is proposed, and the calculation results are in better agreement with test and FE results in comparison with the results predicted according to the current design code.

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.