利用压电波动法对混凝土偏心受压柱裂缝实时监测的试验研究
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摘要
将压电"智能骨料"传感器埋置在钢筋混凝土大、小偏心受压短柱内,利用数字示波器实时接收试验过程中构件因裂缝出现和发展产生的声发射信号的全波形特征,并结合信号处理和损伤识别技术,对两试件破坏过程中的裂缝开展情况进行实时动态监测和评价。试验结果表明:混凝土裂缝出现和发展伴随明显的声发射现象,并利用"智能骨料"能够有效接收声发射波;两试件的声发射波的能量积累过程有明显的差异,初步表明裂缝出现和发展的基本特点;为动态和实时监测裂缝开展状态及结构损伤诊断提供新的途径。
A method is presented for crack online monitoring of concrete compression columns based on piezoelectric sensors.The piezoelectric sensors are embedded in the columns,and a digital oscilloscope receiver is used to obtain the full waveform characteristics of acoustic emission signal during the process of the component damage in real-time.Using signal processing techniques,the damage processes of the two samples are experimentally monitored and evaluated by the piezoelectric sensors.The results of the experiment show that the generation and development of the cracks are obviously companying with the phenomena of acoustic emission which can be detected by the PZT sensors.The energy accumulation process of the acoustic emission signal has obvious deference from these two samples and shows basically the property of the cracks.This technology opens a new road for active monitoring and damage detection on line for cracks of concrete structures.
A method is presented for crack online monitoring of concrete compression columns based on piezoelectric sensors.The piezoelectric sensors are embedded in the columns,and a digital oscilloscope receiver is used to obtain the full waveform characteristics of acoustic emission signal during the process of the component damage in real-time.Using signal processing techniques,the damage processes of the two samples are experimentally monitored and evaluated by the piezoelectric sensors.The results of the experiment show that the generation and development of the cracks are obviously companying with the phenomena of acoustic emission which can be detected by the PZT sensors.The energy accumulation process of the acoustic emission signal has obvious deference from these two samples and shows basically the property of the cracks.This technology opens a new road for active monitoring and damage detection on line for cracks of concrete structures.
引文
[1]李宏男,李东升.土木工程结构安全性评估、健康监测及诊断述评[J].地震工程与工程振动,2002,22(3):82-90.
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[3]MCCANN D M,FORDE M C.Review of NDT methods in the assessmentof concrete and masonry structures[J].NDT&E International,2001,34(2):71-84.
[4]陶宝祺.智能材料结构[M].北京:国防工业出版社,1997.
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[6]陈龙珠,陈晓宝,黄真,等.混凝土结构防灾技术[M].北京:化学工业出版社,2006.
[7]孙明清,李卓球,侯作富.压电材料在土木工程结构健康监测中的应用[J].混凝土,2003(3):22-24.
[8]SONG G,OLMI C,GU H.An overheight vehicle-bridge collision moni-toring system using piezoelectric transducers[J].Smart Materials andStructures,2007,16(2):462-468.
[9]赵晓燕.基于压电陶瓷的结构健康监测与损伤诊断[D].大连:大连理工大学博士论文,2008.
[10]杨晓明.土木工程结构的性能监测系统与损伤识别方法研究[D].天津:天津大学博士论文,2006.
[11]纪洪广,裴广文,单晓云.混凝土材料声发射技术研究综述[J].应用声学,2002,21(4):1-5.
[12]耿荣生.声发射信号处理和分析技术[J].无损检测,2002,24(1):23-28.
[13]KAGEYAMA K,MURAYAMA H,OHSAWA L.Acoustic emissionmonitoring of a reinforced concrete structure by applying new fiber-optic sensors[J].Smart Materials and Structures,2005,14(3):52-59.
[14]GU H,SONG G,DHONDE H,et al.Concrete early-age strength moni-toring using embedded piezoelectric transducers[J].Smart Materials andStructures,2006(15):1837-1845.
[15]SONG G,GU H,MO Y L,et al.Concrete structural health monitoringusing embedded piezoceramic transducers[J].Smart Materials and Struc-tures,2007(16):959-968.
[16]蔡四维,蔡敏.混凝土的损伤断裂[M].北京:人民交通出版社,1999.
[17]沈新普,黄志强,鲍文博,等.混凝土断裂的理论与试验研究[M].北京:中国水利水电出版社,2008.
[18]吴胜兴,张顺祥,沈德建.混凝土轴心受拉声发射Kaiser效应试验研究[J].土木工程学报,2008,41(4):31-39.
[2]李宏男,赵晓燕.压电智能传感结构在土木工程中的研究和应用[J].地震工程与工程振动,2004,24(6):165-172.
[3]MCCANN D M,FORDE M C.Review of NDT methods in the assessmentof concrete and masonry structures[J].NDT&E International,2001,34(2):71-84.
[4]陶宝祺.智能材料结构[M].北京:国防工业出版社,1997.
[5]谢强,薛松涛.土木工程结构健康监测的研究现状与进展[J].中国科学基金,2001,15(5):285-288.
[6]陈龙珠,陈晓宝,黄真,等.混凝土结构防灾技术[M].北京:化学工业出版社,2006.
[7]孙明清,李卓球,侯作富.压电材料在土木工程结构健康监测中的应用[J].混凝土,2003(3):22-24.
[8]SONG G,OLMI C,GU H.An overheight vehicle-bridge collision moni-toring system using piezoelectric transducers[J].Smart Materials andStructures,2007,16(2):462-468.
[9]赵晓燕.基于压电陶瓷的结构健康监测与损伤诊断[D].大连:大连理工大学博士论文,2008.
[10]杨晓明.土木工程结构的性能监测系统与损伤识别方法研究[D].天津:天津大学博士论文,2006.
[11]纪洪广,裴广文,单晓云.混凝土材料声发射技术研究综述[J].应用声学,2002,21(4):1-5.
[12]耿荣生.声发射信号处理和分析技术[J].无损检测,2002,24(1):23-28.
[13]KAGEYAMA K,MURAYAMA H,OHSAWA L.Acoustic emissionmonitoring of a reinforced concrete structure by applying new fiber-optic sensors[J].Smart Materials and Structures,2005,14(3):52-59.
[14]GU H,SONG G,DHONDE H,et al.Concrete early-age strength moni-toring using embedded piezoelectric transducers[J].Smart Materials andStructures,2006(15):1837-1845.
[15]SONG G,GU H,MO Y L,et al.Concrete structural health monitoringusing embedded piezoceramic transducers[J].Smart Materials and Struc-tures,2007(16):959-968.
[16]蔡四维,蔡敏.混凝土的损伤断裂[M].北京:人民交通出版社,1999.
[17]沈新普,黄志强,鲍文博,等.混凝土断裂的理论与试验研究[M].北京:中国水利水电出版社,2008.
[18]吴胜兴,张顺祥,沈德建.混凝土轴心受拉声发射Kaiser效应试验研究[J].土木工程学报,2008,41(4):31-39.
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