Axial compression behavior of double-skin tubular-encased confined-concrete bar columns

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-04-13 DOI:10.1016/j.istruc.2025.108880

Ruofan Gao , Zhi Sun , Jiaqi Liu , Bing Fu , Hong Yuan

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引用次数: 0

Abstract

Fiber-reinforced polymer (FRP) composites have been widely used with other conventional construction materials (e.g., steel and concrete) to form novel new structural members, in which the advantages of each component can be fully utilized. This paper proposed a variant form of double-skin tubular columns (i.e., double-skin tubular-encased confined-concrete bar columns (DTCBCs)), which is composed of an outer steel tube, an inner steel tube, multiple small-diameter concrete-infilled glass FRP (GFRP) tubes and mortar that fills the spaces between these tubes. In order to justify the advantages of the proposed hybrid columns, a series of axial compression tests were conducted on seven DTCBCs along with a double steel tube hollow column as the control specimen with three key parameters being examined. An advanced finite element (FE) model has then been proposed and validated through the test results obtained in this study in various terms. The test results indicate that the DTCBCs exhibit with the load carrying capacity and deformability higher than its DSTC counterpart by up to 73.62 % and 1.8 times. The proposed FE model is able to produce precise predictions for DTCBCs and provide detailed information on the stress and strain distributions of the constituent components of the DTCBCs.

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双层管壳钢筋混凝土柱轴压特性研究

纤维增强聚合物（FRP）复合材料已广泛应用于其他传统建筑材料（如钢和混凝土），形成新颖的新型结构构件，充分发挥各构件的优势。本文提出了一种双表皮管状柱的变形形式（即双表皮管包钢筋混凝土柱（DTCBCs）），它由一根外钢管、一根内钢管、多根小直径玻璃玻璃钢（GFRP）管和填充管间空隙的砂浆组成。为了验证混合柱的优越性，以双钢管空心柱为对照试件，对7根DTCBCs进行了一系列轴压试验，并对3个关键参数进行了检验。然后提出了一种先进的有限元模型，并通过本研究在不同条件下获得的试验结果进行了验证。试验结果表明，DTCBCs的承载能力和变形能力分别比DSTC提高了73.62% %和1.8倍。所提出的有限元模型能够对DTCBCs进行精确的预测，并提供DTCBCs组成部分的应力和应变分布的详细信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.