基于高频压电阻抗谱的钢框架损伤识别研究  

Damage Identification for A Steel Frame Based on the High-frequency Piezoelectric Signatures

作　　者：王炜[1] 严蔚[1] 李万春[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2013年第2期78-82,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省自然科学基金(LY12E08005);浙江省重点科技创新团队项目(2011R09025-03)

摘　　要：采用压电阻抗技术(EMI)对三层钢框架进行了损伤模拟实验,通过拧松钢框架节点的螺栓来模拟损伤,测试了钢框架在不同损伤程度下的电导纳值.并采用均方差(Root Mean Square Deviation,RMSD)、协方差(Covariance)和均方根(Root Mean Square,RMS)作为损伤程度参数指标对实验数据进行了分析,验证了利用压电阻抗技术进行结构健康检测的有效性,表明RMSD指标对反映结构损伤程度更准确可靠.An experiment conducted for probing damage detection is conducted for a three-layered steel frame using electro-mechanical impedance （EMI） technique. Damages are introduced by completely loosening bolts over several locations on the structure and then the piezoelectric admittance signatures are obtained under various damage severities. Experimental data are then analyzed by RMSD （Root Mean Square Deviation）, Covariance and RMS （Root Mean Square） for damage identification quantitatively. The findings show that the EMI technique integrated with RMSD index can identify the damage severity and location more effectively, and thus the present method can provide a reliable and accurate technique for structural health monitoring.

关 键 词：压电阻抗 结构健康检测 钢框架 均方差 

分 类 号：TU328[建筑科学—结构工程]