Flexural behavior of ultra-high-performance concrete (UHPC) encased concrete-filled steel tubular (CFST) beams

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL Structures Pub Date : 2024-09-16 DOI:10.1016/j.istruc.2024.107259

Yuxing Yang , Xuankai Huang , Feiyu Liao , Yufeng Chen , Qiuhui Lin , Ying Wang

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Abstract

The flexural behavior of 12 ultra-high-performance concrete (UHPC) encased concrete-filled steel tubular (CFST) beams was experimentally investigated with steel fiber content. The influence of steel fiber content and CFST diameter on the general structural behavior, failure modes, stiffness, and flexural capacity were discussed. The test results showed that the outer UHPC can work in good coordination with the inner CFST, and steel fiber is effective in improving the overall flexural performance of UHPC encased CFST beams. The predictions of flexural stiffness by existing code provisions were compared with the test results. In addition, numerical analysis was conducted to benchmark test results, and to perform an in-depth analysis of the stress development and load distribution between UHPC, steel and core concrete. The applicability of existing equilibrium section method in predicting the flexural strength of UHPC encased CFST beams was then evaluated, and a reduction factor was proposed to calibrate the calculation results.

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超高性能混凝土（UHPC）包裹混凝土填充钢管（CFST）梁的挠曲行为

实验研究了 12 个超高性能混凝土（UHPC）包裹混凝土填充钢管（CFST）梁的钢纤维含量对其抗弯行为的影响。讨论了钢纤维含量和 CFST 直径对一般结构行为、破坏模式、刚度和抗弯能力的影响。试验结果表明，外层 UHPC 与内层 CFST 能很好地协调工作，钢纤维能有效改善 UHPC 包裹 CFST 梁的整体抗弯性能。现有规范对抗弯刚度的预测与试验结果进行了比较。此外，还进行了数值分析，以测试结果为基准，深入分析了 UHPC、钢材和核心混凝土之间的应力发展和荷载分布。然后，评估了现有平衡截面法在预测 UHPC 包裹 CFST 梁抗弯强度方面的适用性，并提出了校准计算结果的折减系数。

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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.