Experimental Study on Circular Concrete-Filled Steel Tubes and Prediction of Ultimate Load Using Strength Index-Slenderness Ratio Graphs

IF 1.3 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Steel Structures Pub Date : 2026-05-21 DOI:10.1007/s13296-026-01052-z

Fethullah Uslu

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Abstract

An extensive experimental and numerical analysis was conducted to examine the axial compressive behavior of circular concrete-filled steel tube (CFST) columns. A total of 24 specimens with varying geometrical and material parametersincluding three heights (L), three diameters (D), two wall thicknesses (t), and two concrete strength (f_c) classes were tested to assess the effects of slenderness (L/D), sectional slenderness (D/t), and strength index (SI) on the ultimate load capacity of CFST columns. The experimental results indicated that increasing concrete strength enhances the ultimate load capacity, whereas higher L/D ratios lead to pronounced strength reduction. Finite element (FE) models developed in ANSYS were validated against the test data and exhibited excellent agreement, with FE predictions slightly exceeding experimental values. The axial capacities were also evaluated according to AISC 360-16 and Eurocode-4 provisions, with Eurocode-4 yielding closer predictions to the experimental findings. In addition, Strength Index-Slenderness (SI-L/D) plots have been created to estimate the ultimate load-carrying capacities of CFST columns. A practical approach has been proposed using these plots. This approach has demonstrated a robust correlation with the design standards for the evaluation of CFST columns.

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圆形钢管混凝土试验研究及强度指标-长细比图预测极限荷载

对圆形钢管混凝土（CFST）柱的轴压性能进行了广泛的试验和数值分析。采用不同几何和材料参数，包括三种高度(L)、三种直径(D)、两种壁厚(t)和两种混凝土强度（fc）等级，共24个试件进行试验，以评估长细比（L/D）、截面长细比（D/t）和强度指数（SI）对CFST柱极限承载能力的影响。试验结果表明，混凝土极限承载力随混凝土强度的增加而增加，而L/D比越高则强度降低越明显。在ANSYS中建立的有限元模型与试验数据进行了验证，结果显示出良好的一致性，有限元预测值略高于实验值。轴向承载力也根据AISC 360-16和Eurocode-4的规定进行了评估，Eurocode-4给出了更接近实验结果的预测。此外，还建立了强度指数-长细比（SI-L/D）图来估计CFST柱的极限承载能力。利用这些图提出了一种实用的方法。该方法已证明与CFST柱评估的设计标准具有强大的相关性。

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

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.