基于压电波动法的混凝土裂缝损伤主动被动监测对比试验
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摘要
目的对基于压电波动法的混凝土裂缝损伤主动与被动监测方法进行对比研究,探索两种方法的特点以及适用范围.方法将压电陶瓷传感器埋置在两个完全相同的混凝土柱内,两试件分别承受小偏压和大偏压荷载.同时应用主动和被动损伤监测技术对两试件的破坏过程进行监测.结果在被动监测试验中,小偏压试件所释放出的声发射信号能量为大偏压试件的14倍.从能量释放在时长上的分布比重看,小偏压试件在达到极限荷载前就已经释放了80%以上,而大偏压试件只释放不到40%;在主动监测试验中,大、小偏压试件的最终损伤指数分别为78.8%和68.6%.结论被动监测技术能有效反映出试件所受荷载及破坏过程的特点,主动健康监测技术能有效地识别结构处于不同的健康状态,两种方法的特点形成互补.
Contrast tests were developed for the active and passive monitoring technologies of concrete crack based on piezoelectric wave method.The characters and applied ranges of two methods were explored.The piezoceramics transducers were buried into two same concrete columns which bearing small and large eccentric compression respectively.The failure process of specimens was monitored by both active and passive ways.The relationship between test phenomena and results were researched.About passive monitoring test,the energy of acoustic emission signals released from small eccentric compression specimen is 14 times the large eccentric one;about active monitoring test,the damage indexes of two specimens are 78.8% and 68.6%,respectively.Test results show that:the passive monitoring method can reflect the characters of load and failure process,the active monitoring method can reflect the damage degree of specimens.Two methods can complement each other.
Contrast tests were developed for the active and passive monitoring technologies of concrete crack based on piezoelectric wave method.The characters and applied ranges of two methods were explored.The piezoceramics transducers were buried into two same concrete columns which bearing small and large eccentric compression respectively.The failure process of specimens was monitored by both active and passive ways.The relationship between test phenomena and results were researched.About passive monitoring test,the energy of acoustic emission signals released from small eccentric compression specimen is 14 times the large eccentric one;about active monitoring test,the damage indexes of two specimens are 78.8% and 68.6%,respectively.Test results show that:the passive monitoring method can reflect the characters of load and failure process,the active monitoring method can reflect the damage degree of specimens.Two methods can complement each other.
引文
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[16]康玉梅,朱万成,陈耕野,等.基于小波变换的岩石声发射信号互相关分析及时延估计[J].岩石力学,2011,32(7):2079-2084.(Kang Yumei,Zhu Wancheng,Chen Gengye,et al.Cross correlation analysis and time delay estimationof acoustic emission signals of rock based on w avelettransform[J].Rock and Soil Mechanics,2011,32(7):2079-2084.)
[17]赵兴东,李元辉,袁瑞甫,等.基于声发射定位的岩石裂纹动态演化过程研究[J].岩石力学与工程学报,2007,26(5):944-950.(Zhao Xingdong,Li Yuanhui,Yuan Ruifu,et al.Study on crack dynamic propagation process of rocksamples based on acoustic emission location[J].Chinese Journal of Rock Mechanics and Engineer-ing,2007,26(5):944-950.)
[18]吴胜兴,张顺详,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.(Wu Shengxing Zhang Shunxiang,Shen Dejian.Anexperimental study on Kaiser effect of acoustic emis-sion in concrete under uniaxial tension loading[J].China Civil Engineering Journal,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.(Li Hongnan,Zhao Xiaoyan.Research and applica-tion of piezo-intelligent sensors in civil engineering[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(6):165-172.)
[3]蒙彦宇,阎石,孙威,等.压电混凝土梁主动健康监测试验[J].沈阳建筑大学学报:自然科学版,2011,27(2):253-359.(Meng Yanyu,Yan Shi,Sun Wei,et al.Experimentalresearch on active health monitoring of PZT concretebeam[J].Journal of Shenyang Jianzhu University:Natural Science,2011,27(2):253-359.)
[4]孙威,阎石,蒙彦宇,等.压电陶瓷混凝土结构应力波衰减特性试验[J].沈阳建筑大学学报:自然科学版,2010,26(5):833-837.(Sun Wei,Yan Shi,Meng Yanyu,et al.Experimentalresearch on stress w ave attenuation behavior of con-crete structure w ith piezoelectric ceramic sensors[J].Journal of Shenyang Jianzhu University:NaturalScience,2010,26(5):833-837.)
[5]Yan Shi,Sun Wei.Numerical simulation for concretestructure health monitoring based on smart piezoelec-tric transducer array[J].Advance in Science andTechnology,2008,56:469-476.
[6]Yan Shi,Sun Wei,Song Gangbing,et al.Health mo-nitoring of reinforced concrete shear w alls usingsmart aggregates[J].Smart Materials and Struc-tures,2009,18(4):1-7.
[7]Soh C K,Tseng K K,Bhalla S,et al.Performance ofsmart piezoceramic patches in health monitoring of aRC bridge[J].Smart Materials and Structures,2000,9(4):533-542.
[8]Tseng K K,Wang L S.Smart piezoelectric transduc-ers for in situ health monitoring of concrete[J].Smart Materials and Structures,2004,13(5):1017-1024.
[9]Bhalla S,Soh C K.Structural impedance based dam-age diagnosis by piezo-transducers[J].EarthquakeEng.Struct.Dyn.,2003,32(12):1897-1916.
[10]Giurgiutiu V,Zagrai A N.Embedded self-sensing pi-ezoelectric active sensors for online structural identi-fication[J].Journal of Vbrition and Acoustic,2002,124(1):116-125.
[11]Xu Y G,Liu G R.A modified electro-mechanicalimpedance model of piezoelectric actuator-sensorsfor debonding detection of composite patches[J].Journal of Intelligent Material Systems and Struc-tures,2002,13(6):389-396.
[12]Bhalla S,Soh C K.Structural health monitoring bypiezo-impedance transducers I:modeling[J].Journalof Aerospace Engineering,2004,17(4):154-165.
[13]Song G,Gu H,Mo Y L,et al.Concrete structuralhealth monitoring using embedded piezoceramictransducers[J].Smart Materials and Structures,2007,16(4):959-968.
[14]Gu H,Song G,Dhonde H,et al.Concrete early-agestrength monitoring using embedded piezoelectrictransducers[J].Smart materials and structures,2006,15(2):1837-1845.
[15]Song G,Olmi C,Gu H.An overheight vehicle-bridgecollision monitoring system using piezoelectric trans-ducers[J].Smart Materials and Structures,2007,16(2):462-468.
[16]康玉梅,朱万成,陈耕野,等.基于小波变换的岩石声发射信号互相关分析及时延估计[J].岩石力学,2011,32(7):2079-2084.(Kang Yumei,Zhu Wancheng,Chen Gengye,et al.Cross correlation analysis and time delay estimationof acoustic emission signals of rock based on w avelettransform[J].Rock and Soil Mechanics,2011,32(7):2079-2084.)
[17]赵兴东,李元辉,袁瑞甫,等.基于声发射定位的岩石裂纹动态演化过程研究[J].岩石力学与工程学报,2007,26(5):944-950.(Zhao Xingdong,Li Yuanhui,Yuan Ruifu,et al.Study on crack dynamic propagation process of rocksamples based on acoustic emission location[J].Chinese Journal of Rock Mechanics and Engineer-ing,2007,26(5):944-950.)
[18]吴胜兴,张顺详,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.(Wu Shengxing Zhang Shunxiang,Shen Dejian.Anexperimental study on Kaiser effect of acoustic emis-sion in concrete under uniaxial tension loading[J].China Civil Engineering Journal,2008,41(4):31-39.)
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