FRP-钢管约束混凝土损伤声发射监测及健康诊断
发布时间：2018-12-14 00:45
【摘要】：组合结构是土木工程中一种重要的结构形式。目前组合结构结构形式越来越广泛,并且应用组合结构的建筑结构一般较为重要,一旦发生破坏,造成的社会经济损失将会非常严重,目前对其的研究主要集中在力学性能方面,对该结构损伤机理的认识还缺少充分的研究成果。本文主要利用声发射监测技术对CFRP-钢管约束混凝土这一类型的组合结构的损伤发展和损伤模式识别进行了研究,主要内容如下：首先,对构件层次进行了CFRP-钢管约束混凝土损伤发展的研究,用声发射技术对CFRP/钢板复合材料的拉伸破坏过程进行了监测,分别进行了单轴拉伸和循环拉伸试验。用哨兵函数(Sentry Function)对CFRP-钢板复合材料的单轴拉伸进行了损伤发展评估,用损伤指数ID和改进损伤指数MID对CFRP-钢板复合材料的循环拉伸进行了损伤发展评估,两种方法都能对CFRP-钢板复合材料的损伤发展进行评估和预测。其次,进行了CFRP-钢管复合约束混凝土柱轴压作用下的声发射监测试验,并对其损伤发展进行了分析。利用声发射累积能量、RA和AF值分析、信号强度分析和b值分析分别对CFRP-钢管复合约束混凝土柱在轴压作用下的受力状态、混凝土裂缝形式发展变化、损伤强弱程度和损伤裂缝的发展进行了分析和评估。分析结果表明,利用有效的声发射参数能够很好表征CFRP-钢管复合约束混凝土损伤演化过程及其破坏形态。最后,对利用测得的CFRP-钢管复合约束混凝土柱轴压作用下的声发射监测数据,对其的损伤模式进行了识别。首先利用首先利用模糊C均值聚类算法将试件的声发射信号进行聚类,对试件的损伤进行了初步识别,根据聚类结果,对不同损伤源的声发射信号进行探讨。根据聚类结果,利用波形分析技术和小波分析对各类信号的频率进行分析,进一步对试件的损伤进行了识别。
[Abstract]:Composite structure is an important structural form in civil engineering. At present, the form of composite structure is more and more extensive, and the building structure with composite structure is generally more important. Once the damage occurs, the social and economic losses will be very serious. At present, the research is mainly focused on the mechanical properties of the structure, and the understanding of the damage mechanism of the structure is still lack of sufficient research results. In this paper, acoustic emission monitoring technology is used to study the damage development and damage pattern identification of CFRP- steel tube confined concrete composite structure. The main contents are as follows: firstly, The damage development of CFRP- steel tube confined concrete was studied. The tensile failure process of CFRP/ steel plate composites was monitored by acoustic emission technique. Uniaxial and cyclic tensile tests were carried out respectively. Sentinel function (Sentry Function) was used to evaluate the damage development of CFRP- composite under uniaxial tension. The damage development of CFRP- composite was evaluated by damage index ID and improved damage index MID. Both methods can be used to evaluate and predict the damage development of CFRP- steel plate composites. Secondly, acoustic emission monitoring test of CFRP- steel tube composite confined concrete column under axial compression is carried out, and its damage development is analyzed. The cumulative energy of acoustic emission, RA and AF value analysis, signal strength analysis and b value analysis are used to analyze the stress state of CFRP- steel tube composite confined concrete column under axial compression, and the development and change of concrete crack form, respectively. The degree of damage and the development of damage crack are analyzed and evaluated. The results show that the damage evolution process and failure pattern of CFRP- steel tube confined concrete can be well characterized by using effective acoustic emission parameters. Finally, the damage mode of CFRP- steel tube composite confined concrete column under axial compression is identified by acoustic emission monitoring data. Firstly, the acoustic emission signals of the samples are clustered by fuzzy C-means clustering algorithm, and the damage of the samples is preliminarily identified. According to the clustering results, the acoustic emission signals from different damage sources are discussed. According to the clustering results, the frequency of various signals is analyzed by waveform analysis and wavelet analysis, and the damage of the samples is further identified.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU317
本文编号：2377569
[Abstract]:Composite structure is an important structural form in civil engineering. At present, the form of composite structure is more and more extensive, and the building structure with composite structure is generally more important. Once the damage occurs, the social and economic losses will be very serious. At present, the research is mainly focused on the mechanical properties of the structure, and the understanding of the damage mechanism of the structure is still lack of sufficient research results. In this paper, acoustic emission monitoring technology is used to study the damage development and damage pattern identification of CFRP- steel tube confined concrete composite structure. The main contents are as follows: firstly, The damage development of CFRP- steel tube confined concrete was studied. The tensile failure process of CFRP/ steel plate composites was monitored by acoustic emission technique. Uniaxial and cyclic tensile tests were carried out respectively. Sentinel function (Sentry Function) was used to evaluate the damage development of CFRP- composite under uniaxial tension. The damage development of CFRP- composite was evaluated by damage index ID and improved damage index MID. Both methods can be used to evaluate and predict the damage development of CFRP- steel plate composites. Secondly, acoustic emission monitoring test of CFRP- steel tube composite confined concrete column under axial compression is carried out, and its damage development is analyzed. The cumulative energy of acoustic emission, RA and AF value analysis, signal strength analysis and b value analysis are used to analyze the stress state of CFRP- steel tube composite confined concrete column under axial compression, and the development and change of concrete crack form, respectively. The degree of damage and the development of damage crack are analyzed and evaluated. The results show that the damage evolution process and failure pattern of CFRP- steel tube confined concrete can be well characterized by using effective acoustic emission parameters. Finally, the damage mode of CFRP- steel tube composite confined concrete column under axial compression is identified by acoustic emission monitoring data. Firstly, the acoustic emission signals of the samples are clustered by fuzzy C-means clustering algorithm, and the damage of the samples is preliminarily identified. According to the clustering results, the acoustic emission signals from different damage sources are discussed. According to the clustering results, the frequency of various signals is analyzed by waveform analysis and wavelet analysis, and the damage of the samples is further identified.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU317
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相关博士学位论文 前1条
1 车媛;CFRP-钢管混凝土压弯构件的力学性能研究[D];大连理工大学;2013年
相关硕士学位论文 前1条
1 许丽利;聚类分析的算法及应用[D];吉林大学;2010年
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