Experimental and Finite Element Method Investigation of Axial Load Carrying Capacity of Concrete Filled Circular Steel Tube Columns According to Different Slenderness Ratios

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Steel Structures Pub Date : 2024-05-07 DOI:10.1007/s13296-024-00842-7

Fethullah Uslu, Kıvanç Taşkın

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Abstract

In this study, a total of 70 experiment specimens, 56 of circular cross-section concrete filled steel tube (CFST) columns and 14 hollow steel tubes with various geometric and material properties, were tested under axial loading. Composite columns with four different concrete compressive strength (f_c), three different diameter/thickness (D/t) ratio and seven different length/diameter (L/D) ratio used in the experiment samples were designed. The ultimate axial force, axial deformation, and failure modes of the CFST columns obtained from the experiment results were determined. Concrete contribution Ratio index, and strength index were determined from the test results obtained. The ultimate axial force of CFST columns were compared with standards such as AISC360-16 and Eurocode 4. Finally, the finite element (FE) model is proposed to predict the ultimate axial force and behaviour of CFST columns. According to the results obtained, the ultimate axial force of the CFST columns increased as the fc and D/t ratio increased, while the ultimate axial force decreased as the L/D ratio increased. According to the experiment results, it has been seen that the ultimate axial force of the CFST columns is closer to the Eurocode 4 standard. The results obtained from the FE models were calculated on mean 5% more than the experimental results.

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不同纤度比下混凝土填充圆钢管柱轴向承载能力的实验和有限元法研究

本研究共对 70 个实验样本进行了轴向加载测试，其中包括 56 个圆形截面混凝土填充钢管（CFST）柱和 14 个具有不同几何和材料特性的空心钢管。设计了四种不同的混凝土抗压强度（fc）、三种不同的直径/厚度（D/t）比和七种不同的长度/直径（L/D）比的复合柱。根据实验结果确定了 CFST 柱的极限轴力、轴向变形和破坏模式。根据试验结果确定了混凝土贡献率指数和强度指数。CFST 柱的极限轴力与 AISC360-16 和 Eurocode 4 等标准进行了比较。最后，提出了有限元（FE）模型来预测 CFST 柱的极限轴力和行为。根据所得结果，CFST 柱的极限轴力随着 fc 和 D/t 比的增加而增加，而极限轴力随着 L/D 比的增加而减小。根据实验结果，可以看出 CFST 柱的极限轴力更接近于欧洲规范 4 的标准。有限元模型计算得出的结果比实验结果平均高出 5%。

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来源期刊

International Journal of Steel Structures 工程技术-工程：土木

CiteScore

2.70

自引率

13.30%

发文量

122

审稿时长

12 months

期刊介绍： The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.