Axial compression behavior and reliable design approach of rectangular dune sand concrete-filled steel tube stub columns

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Developments in the Built Environment Pub Date : 2024-04-01 DOI:10.1016/j.dibe.2024.100437

Said Ikram Sadat, Fa-xing Ding, Fei Lyu, En Wang, Hao Sun, Khalid Akhunzada, Naqi Lessani

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Abstract

Concrete-filled steel tube (CFST) columns, incorporating various types of concrete, are increasingly prevalent in engineering applications. This study develops a finite element (FE) model and a design methodology for rectangular dune sand-concrete-filled steel tube (DS-CFST) columns. Investigating the composite behavior of rectangular DS-CFST columns and the effects of different DS replacement ratios, the results indicate a reduction in the ultimate bearing capacity compared to traditional CFST columns, attributed to diminished confinement effects, particularly at higher DS replacement ratios. Analysis of different design factors, including concrete and steel strengths, steel ratio, and aspect ratio, assesses their impacts on axial load-bearing capacity and composite behavior. This analysis leads to the establishment of a design formula, validated through experiments and FE analysis. The formula's efficacy and conciseness are evaluated against current design codes, with a reliability study assessing sensitivity to fluctuations. The proposed formula demonstrates accurate predictions of the ultimate load-bearing capacity.

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矩形沙丘砂混凝土填充钢管桩柱的轴向压缩行为和可靠设计方法

采用各种类型混凝土的混凝土填充钢管（CFST）柱在工程应用中越来越普遍。本研究为矩形沙丘砂混凝土填充钢管（DS-CFST）柱开发了有限元（FE）模型和设计方法。研究了矩形 DS-CFST 柱的复合行为和不同 DS 替代率的影响，结果表明，与传统 CFST 柱相比，其极限承载能力有所降低，这归因于约束效应的减弱，尤其是在 DS 替代率较高的情况下。对不同设计因素（包括混凝土和钢材强度、钢材比率和长宽比）的分析评估了它们对轴向承载能力和复合行为的影响。通过分析，建立了一个设计公式，并通过实验和 FE 分析进行了验证。根据当前的设计规范，对公式的有效性和简洁性进行了评估，并通过可靠性研究评估了对波动的敏感性。所提出的公式能够准确预测最终承载能力。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.