基于压电波动法的混凝土裂缝损伤监测技术
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摘要
针对混凝土结构裂缝损伤,探索一种基于压电波动法的裂缝损伤监测方法。分析了混凝土裂缝对应力波的作用机理,以此为基础提出了损伤程度的判别方法,同时结合混凝土结构的特点,以传感器列阵作为损伤近似定位的方法。最后,针对不同类型的混凝土试件,开展了验证性试验。将压电传感器以智能骨料的形式成对的埋置在混凝土构件内部对其在裂缝损伤发展状况进行监测。其中一个传感器用于发射信号,另一个用于接收信号,依据提出的损伤识别方法对试件损伤进行监测识别。监测试验结果与试件损伤实际情形相吻合。结果表明:所提出方法能很好地揭示损伤的发展趋势,可用于混凝土结构服役期间的裂缝损伤监测。
A method based on piezoceramic transducers and a wave analysis method was developed for monitoring crack damage of concrete structures.The monitoring mechanism how crack influences the stress wave propagating in concrete was analyzed.A discriminate method for damage degree was proposed and a damage approximate locating method based on a transducer array was employed according to the characters of civil engineering structures.At last,a validation test was conducted for different reinforced concrete members with the proposed method.Piezoelectric sensors were buried into concrete in form of smart aggregates in pairs.One sensor was used to transmit signals and the other to receive the signals.The damages were monitored and identified by the proposed method.The test results were agreed with the situation of crack damages.It indicates that the proposed method could reflect the developing tendency of damage well and it is suitable to be used for service state mornitoring of concrete structures.
A method based on piezoceramic transducers and a wave analysis method was developed for monitoring crack damage of concrete structures.The monitoring mechanism how crack influences the stress wave propagating in concrete was analyzed.A discriminate method for damage degree was proposed and a damage approximate locating method based on a transducer array was employed according to the characters of civil engineering structures.At last,a validation test was conducted for different reinforced concrete members with the proposed method.Piezoelectric sensors were buried into concrete in form of smart aggregates in pairs.One sensor was used to transmit signals and the other to receive the signals.The damages were monitored and identified by the proposed method.The test results were agreed with the situation of crack damages.It indicates that the proposed method could reflect the developing tendency of damage well and it is suitable to be used for service state mornitoring of concrete structures.
引文
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[10]孙威.利用压电陶瓷的智能混凝土健康监测技术[D].大连:大连理工大学,2009.Sun Wei.Health monitoring technology for smartconcrete stuctures using piezoelectric ceramic[D].Dalian:Dalian University of Technology,2009.(inChinese)
[2]周智,欧进萍.用于土木工程的智能监测传感材料性能及比较研究[J].建筑技术,2005,2(5):12―22.Zhou Zhi,Ou Jinping.Comparative study of smartsensing material used in the smart monitoring of civilengineering[J].Architecture Technology,2005,2(5):12―22.(in Chinese)
[3]任勇生.智能材料在土木结构监测和振动控制中的应用[J].太原理工大学学报,2000,31(5):486―493.Ren Yongsheng.Applications of intelligent materials invibration monitoring and controlling of civil structures[J].Journal of Taiyuan University of Technology,2000,31(5):186―493.(in Chinese)
[4]曹照平,王社良.智能材料结构在土木工程中的应用[J].重庆建筑大学学报,2001,23(1):108―113.Cao Zhaoping,Wang Sheliang.Study on application ofintelligent material systems and structures to civilengineering[J].Journal of Chongqing Jianzhu University,2001,23(1):108―113.(in Chinese)
[5]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,2003,161(3):22―24.Sun Mingqing,Li Zhuoqiu,Hou Zuofu.Application ofpiezoelectric materials in structural health monitoring ofcivil engineering structures[J].Conrete,2003,161(3):22―24.(in Chinese)
[6]李宏男,赵晓燕.压电智能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 application ofpiezo-intelligent sensors in civil engineering[J].Journalof Earthquake Engineering and Engineering Vibration,2004,24(6):165―172.(in Chinese)
[7]Gu H,Song G,Dhonde H.Concrete early-age strengthmonitoring using embedded piezoelectric transducers[J].Smart Materials and Structures,2006,15(2):1837―1845.
[8]Song G,Gu H,Mo Y L,Hsu T,Dhonde H.Concretestructural health monitoring using embeddedpiezoceramic transducers[J].Smart Materials andStructures,2007,16(4):959―968.
[9]王卫华,李夕兵,周子龙,张义平.不同应力波在张开节理处的能量传递规律[J].中南大学学报,2006,37(2):376―380.Wang Weihua,Li Xibing,Zhou Zilong,Zhang Yiping.Energy-transmitted rule of various stress waves acrossopen joint[J].Journal of Central South University,2006,37(2):376―380.(in Chinese)
[10]孙威.利用压电陶瓷的智能混凝土健康监测技术[D].大连:大连理工大学,2009.Sun Wei.Health monitoring technology for smartconcrete stuctures using piezoelectric ceramic[D].Dalian:Dalian University of Technology,2009.(inChinese)
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