Mechanical Behavior of Stirrup-enhanced Improved Welded Concrete Filled L-shaped Steel Tubular Stub Columns under Axial Compression

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-09-12 DOI:10.1007/s12205-024-1571-9

En Wang, Fei Lyu, Faxing Ding, Jun Chen, Xuemei Liu

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Abstract

In this paper, we conducted the axial compression test on one improved welded concrete filled L-shaped steel tube (IWCFLST) stub column and two stirrup-enhanced IWCFLST stub columns. The experimental results indicate that the stirrup-enhanced IWCFLST stub columns exhibit better compressive mechanical properties. The stirrups can increase the axial compressive load-bearing capacity by up to 35% and the ductility coefficients by 77%. The impact of the equivalent stirrup ratio on the axial compression mechanical behavior was investigated. Three-dimensional (3D) solid finite element (FE) model of the specimens was constructed by ABAQUS. Parametric analysis was performed and the restriction action of IWCFLST stub column under axial compression was studied. The numerical study revealed the working mechanism of stirrups, steel tubes on concrete, while direct confinement of concrete elevates its axial stress level. Considering the shape and the stirrups, the axial compression ultimate load-bearing capacity design method of the IWCFLST stub column was proposed, providing data support for the promotion and application of special-shaped CFST columns.

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轴向压缩条件下箍筋增强改良焊接混凝土填充 L 型钢管支柱的力学行为

本文对一根改进型焊接混凝土填充 L 形钢管（IWCFLST）桩柱和两根箍筋增强型 IWCFLST 桩柱进行了轴向压缩试验。实验结果表明，箍筋增强型 IWCFLST 存根柱具有更好的抗压机械性能。箍筋可将轴向抗压承载力提高 35%，延性系数提高 77%。研究了等效箍筋比对轴向压缩力学性能的影响。试样的三维实体有限元（FE）模型由 ABAQUS 建立。进行了参数分析，并研究了 IWCFLST 存根柱在轴向压缩下的限制作用。数值研究揭示了箍筋和钢管对混凝土的作用机理，而对混凝土的直接约束则提高了其轴向应力水平。在考虑形状和箍筋的情况下，提出了 IWCFLST 短柱的轴压极限承载力设计方法，为异形 CFST 柱的推广应用提供了数据支持。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.