Experimental investigation of the behavior of UHPCFST under repeated eccentric compression

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-10-21 DOI:10.1016/j.compstruct.2024.118661

Chunlei Yu , Min Yu , Lihua Xu , Sumei Liu , Zewen Sun , Jianqiao Ye

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Abstract

This paper investigates the mechanical behavior of ultra-high-performance concrete-filled steel tubes (UHPCFST) under repeated eccentric compression. A total of 30 UHPCFST specimens are designed, fabricated, and tested. The design variables include steel tube thickness, UHPC type, loading eccentricity and load pattern. Failure modes, force-axial shortening curves, section strain distributions, lateral deflection distributions, bearing capacity and stiffness are studied. Three failure modes, i.e., steel tube bulge, compressive crush and tensile crack of the UHPC infill are observed. Specimens with larger loading eccentricity and thinner steel tube are more likely to exhibit all the three modes. Subjected to eccentric loading, the compressive strength and stiffness of the UHPCFST increase significantly with the increase of steel tube thickness and UHPC strength. In the case of repeated loading, stiffness degradation is observed. Existing formulas for the N-M curve and the eccentric compressive capacity are evaluated against the test results. A formula for eccentric compressive stiffness is derived based on the parabolic function assumption. Additionally, an empirical model is introduced to describe the force-axial shortening relationship of the UHPCFST under repeated eccentric compression, which may be applied in practical design and analysis.

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对 UHPCFST 在反复偏心压缩下的行为进行实验研究

本文研究了超高性能混凝土填充钢管（UHPCFST）在反复偏心压缩下的力学行为。共设计、制作和测试了 30 个 UHPCFST 试件。设计变量包括钢管厚度、UHPC 类型、加载偏心率和加载模式。对破坏模式、力-轴向缩短曲线、截面应变分布、侧向挠度分布、承载能力和刚度进行了研究。观察到三种破坏模式，即钢管隆起、压缩挤压和超高性能混凝土填充物的拉伸裂缝。加载偏心越大、钢管越薄的试样越有可能出现上述三种失效模式。在偏心加载条件下，随着钢管厚度和 UHPC 强度的增加，UHPCFST 的抗压强度和刚度也显著增加。在重复加载的情况下，会出现刚度下降。根据试验结果对现有的 N-M 曲线和偏心抗压能力公式进行了评估。根据抛物线函数假设推导出偏心压缩刚度公式。此外，还引入了一个经验模型来描述 UHPCFST 在反复偏心压缩下的力-轴向缩短关系，该模型可用于实际设计和分析。

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

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.