Behaviour of high-performance alkali-activated slag concrete-filled double-skin steel tubes under compression loading

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-06-26 DOI:10.1617/s11527-024-02407-w

Shivam Kumar, Pramod Kumar Gupta, Mohd. Ashraf Iqbal

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Abstract

This study investigates the behaviour of high-performance alkali-activated slag concrete-filled double steel tubular (HACFDST) columns under axial compression. Utilizing high-performance alkali-activated slag concrete (HPAASC) in concrete-filled double steel tubes (CFDST) results in an innovative composite member combining the benefits of both technological domains. HPAASC, a sustainable substitute for conventional concrete, contributes to improved environmental friendliness, while CFDST enhances structural capabilities. Fourteen HACFDST specimens, comprising six circular and eight square sections, were tested to enhance our understanding of the structural performance of HACFDST members through experimental and numerical methodologies. A numerical model was proposed to predict the behaviour of circular and square HACFDST columns under axial compression. The assessment of experimental and numerical findings demonstrates that the proposed numerical model accurately forecasts the behavior of axially loaded HACFDST columns with circular and square sections. Increasing the L/Do or L/B ratio of the specimen results in decreased axial stiffness but enhances ductility. Additionally, beyond peak strength, square HACFDST columns exhibit a sharper decline in strength compared to their circular counterparts. As the L/Do or L/B ratio of HACFDST specimens increases from 2.88 to 7.95, the compressive strength index decreases from 1.28 to 1.2, emphasizing the need to optimize specimen dimensions to maximize the benefits of steel tube confinement.

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高性能碱活性矿渣混凝土填充双层钢管在压缩荷载下的行为

本研究探讨了高性能碱活性矿渣混凝土填充双钢管（HACFDST）柱在轴向压缩下的行为。在混凝土填充双层钢管（CFDST）中使用高性能碱活性矿渣混凝土（HPAASC）可产生一种创新的复合构件，兼具两种技术领域的优点。HPAASC 是传统混凝土的可持续替代品，有助于改善环境友好性，而 CFDST 则增强了结构能力。我们测试了 14 个 HACFDST 试件（包括 6 个圆形截面和 8 个方形截面），以通过实验和数值方法加深对 HACFDST 构件结构性能的了解。我们提出了一个数值模型来预测圆形和方形 HACFDST 柱在轴向压缩下的行为。对实验和数值结果的评估表明，所提出的数值模型能准确预测圆形和方形截面 HACFDST 柱在轴向加载下的行为。增加试样的 L/Do 或 L/B 比率会降低轴向刚度，但会增强延性。此外，超过峰值强度后，方形 HACFDST 柱的强度下降幅度比圆形柱更大。随着 HACFDST 试样的 L/Do 或 L/B 比率从 2.88 增至 7.95，抗压强度指数从 1.28 降至 1.2，这说明需要优化试样尺寸，以最大限度地发挥钢管约束的优势。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.