基于声发射监测的轴压圆形钢管混凝土柱损伤评估及破坏机制分析

IF 5.7 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Pan Gao, Jiepeng Liu, Xuanding Wang, Yubo Jiao, Wenchen Shan
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引用次数: 0

摘要

钢管混凝土(CFST)柱由于其优异的承载能力,经常被用作工程结构的主要受力构件。然而,由于钢管的存在,仅靠传统的力学测量方法无法准确检测混凝土的损伤特征。本文基于声发射技术对钢管混凝土轴心受压柱的混凝土损伤进行了定量研究。通过包括振幅、数量和能量在内的累积AE参数,钢管混凝土柱的轴压过程可以分为五个主要阶段(第一阶段分为两个子阶段),以表示不同的损伤程度。结合声发射结果和力学现象,解释了混凝土各阶段的损伤特征。使用历史指数(HI)和严重程度(Sr)对轴向压缩过程进行了敏感性分析,发现HI和Sr的突然上升与不同加载阶段的变化相对应。根据AE振幅计算的改进的b(Ib)值分析反映了裂纹的演化机制,可用于识别试样的最终失效力矩。最后,提出了一种处理和分析声发射参数的新方法,有效地提高了钢管混凝土损伤实时监测信息的维数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Damage evaluation and failure mechanism analysis of axially compressed circular concrete-filled steel tubular column via AE monitoring
Concrete-filled steel tubular (CFST) columns are frequently used as the main load-bearing components in engineering structures due to their excellent load-bearing capacity. However, the presence of steel tube makes it impossible to accurately detect the damage characteristics of concrete by only relying on traditional mechanical measurement methods. This article quantitatively investigates the concrete damage of circular CFST column during axial compression based on the acoustic emission (AE) technique. Through the cumulative AE parameters including amplitude, count, and energy, the axial compression process of the CFST column can be divided into five main stages (Stage I is divided into two substages) to represent the different damage degree. The damage characteristics of concrete at each stage were explained by combining AE results and mechanical phenomena. A sensitivity analysis of the axial compression process was carried out using the Historic Index ( HI) and Severity ( Sr) and found that the sudden rise in HI and Sr corresponded to the changes in the different loading stages. The Improved b ( Ib) value analysis calculated from the AE amplitudes reflects the evolution mechanism of the crack and can be used for the identification of the final failure moment of the specimen. Finally, a new method for processing and analyzing AE parameters was proposed, which effectively enhanced the dimensionality of real-time monitoring information on the damage of concrete filled in the steel tube.
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来源期刊
CiteScore
12.80
自引率
12.10%
发文量
181
审稿时长
4.8 months
期刊介绍: Structural Health Monitoring is an international peer reviewed journal that publishes the highest quality original research that contain theoretical, analytical, and experimental investigations that advance the body of knowledge and its application in the discipline of structural health monitoring.
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