Acoustic Emission characteristics and damage evolution of Concrete-Encased CFST columns under compressive load

IF 4.7 2区 工程技术 Q1 MECHANICS Engineering Fracture Mechanics Pub Date : 2024-10-19 DOI:10.1016/j.engfracmech.2024.110578
Wei Shen , Hao Bai , Fei Wang , Cong Li , Fangzhu Du
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Abstract

Concrete-Encased Concrete Filled Steel Tubular (CE-CFST) is usually served as a compression member in engineering structures due to its high performance. It is crucial to reveal its compressive failure mechanism and the damage evolution law. This study used Acoustic Emission (AE) technology to monitor the compressive failure behavior of seven groups of CE-CFST columns with different diameter-width ratio, slenderness ratio and eccentricity, and then the AE signal characteristics and structural damage evolution law were discussed. Results show that the curve of AE characteristics can be used for effectively identifying the damage stages of CE-CFST structures. The failure process can be divided into six stages: initial compaction, stable growth of micro cracks, unstable propagation of macro cracks, collapsing of the outer RC structure, bulging of the core CFST structure and overall failure. The AE characteristic parameters, RA-AF value and b value are closely related to stress and crack of structure, and can be used for early warning of structural failure during the stage of unstable crack propagation. Particularly, the failure of outer concrete can be judged as b value drops to the minimum. The current study is of great significance for understanding the damage evolution process and achieving damage assessment of CE-CFST structures.
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抗压荷载下混凝土嵌入式 CFST 柱的声发射特性和损伤演变
混凝土套筒混凝土填充钢管(CE-CFST)因其高性能,通常在工程结构中用作受压构件。揭示其抗压破坏机理和损伤演变规律至关重要。本研究采用声发射(AE)技术监测了 7 组不同径宽比、细长比和偏心率的 CE-CFST 柱的受压破坏行为,并探讨了 AE 信号特征和结构损伤演变规律。结果表明,AE 特性曲线可用于有效识别 CE-CFST 结构的破坏阶段。破坏过程可分为六个阶段:初始压实、微裂纹稳定增长、宏观裂纹不稳定扩展、外层 RC 结构坍塌、核心 CFST 结构隆起和整体破坏。AE 特性参数、RA-AF 值和 b 值与结构的应力和裂缝密切相关,可用于不稳定裂缝扩展阶段的结构破坏预警。特别是当 b 值降至最小值时,可判断外层混凝土的破坏。本研究对于理解 CE-CFST 结构的损伤演变过程和实现损伤评估具有重要意义。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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