组合结构空洞缺陷检测压电阻抗数值模拟研究  

Study on Numerical Simulation of Piezoelectric Impedance Detection of Composite Concrete Structure Defects

作　　者：温家宇 许斌[2,3] 王海东[1] WEN Jiayu;XU Bin;WANG Haidong(College of Civil Engineering,Hunan University,Changsha 410082,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Key Lab.for Structural Engineering and Disaster Prevention of Fujian Province(Huaqiao University),Xiamen 361021,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]华侨大学土木工程学院,福建厦门361021 [3]福建省结构工程与防灾重点实验室(华侨大学),福建厦门361021

出　　处：《压电与声光》2018年第2期276-279,共4页Piezoelectrics & Acoustooptics

基　　金：国际科技合作与交流专项基金资助项目(2014DFE70230);湖南省科技计划重点基金资助项目(2014TT1006)

摘　　要：钢管混凝土等组合结构在超高层建筑中的应用日益广泛,其核心混凝土的空洞缺陷会严重影响构件的力学性能。该文利用数值模拟法对基于压电阻抗的核心混凝土空洞缺陷检测技术的作用机理进行了深入研究。通过对比有、无缺陷区域的阻抗计算结果,分析判定缺陷位置,并定义偏差均方根损伤指标来评估测点位置的损伤程度。结果表明,核心混凝土空洞缺陷的存在会导致相应位置的嵌入式压电传感器阻抗频率曲线产生显著变化,所定义的损伤指标可有效识别核心混凝土的空洞缺陷,数值模拟法成功验证了基于压电阻抗法的核心混凝土空洞缺陷检测技术的有效性。The concrete-filled steel tubular structureshave been widely employed in the super high-rise buildings,while the cavity defect inthecorewill seriously affectthe mechanical behaviorof the components.In this study,the action mechanism of the core concrete cavity defect detection technology based on the piezoelectric impedance is intensively investigated by suing the numerical simulation method.By comparing the calculation results of impedance with and without defect region,the position of defect is analyzed and determined,and the root-mean-square of deviation damage index is defined to evaluate the damage degree at the detecting point.The results show that the existence of core concrete cavity defects will lead to a significant change in the impedance frequency curve of the embedded piezoelectric sensor in the corresponding position,and the defined damage index can effectively identify the cavity defects of the core concrete.The effectiveness of the core concrete cavity defect detection technology based on the piezoelectric impedance method is successfully verified by the numerical simulation method.

关 键 词：压电陶瓷 压电阻抗法 钢管混凝土结构 空洞缺陷检测 数值模拟 缺陷评价指标 

分 类 号：TN384[电子电信—物理电子学]