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（1 北京工業(yè)職業(yè)技術(shù)學(xué)院建筑與測(cè)繪工程學(xué)院， 北京 100042; 2 中信建設(shè)有限責(zé)任公司， 北京 100027)

［摘要］針對(duì)PZT傳感器頻率響應(yīng)范圍寬廣的特性，提出了一種將PZT傳感器同時(shí)用于應(yīng)變測(cè)量和聲發(fā)射監(jiān)測(cè)的多功能監(jiān)測(cè)方法。通過小波Mallat分解將PZT傳感器信號(hào)中的應(yīng)變信號(hào)和聲發(fā)射信號(hào)分離，利用PZT傳感器的低頻應(yīng)變響應(yīng)監(jiān)測(cè)結(jié)構(gòu)的應(yīng)變狀態(tài)，同時(shí)通過聲發(fā)射的b值理論，對(duì)結(jié)構(gòu)的損傷狀況評(píng)估預(yù)警。進(jìn)行了鋼筋混凝土梁的動(dòng)態(tài)破壞監(jiān)測(cè)試驗(yàn)，驗(yàn)證了該方法的可行性。結(jié)果表明，PZT傳感器的低頻電壓信號(hào)和應(yīng)變傳感器的應(yīng)變信號(hào)一致，且聲發(fā)射信號(hào)能準(zhǔn)確反映結(jié)構(gòu)的損傷狀況。

［關(guān)鍵詞］PZT傳感器； Mallat分解； 應(yīng)變響應(yīng)； 聲發(fā)射； b值理論

中圖分類號(hào)：TU375， TP212-9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)05-0044-04

Research on the multi-functional health monitoring of concrete structure based on PZT transducer

Zhang Lili1, Li Xu2

(1 Department of Architectural and Surveying & Mapping Engineering, Beijing Polytechnic College, Beijing 100042， China; 2 CITIC Construction Co., Ltd., Beijing 100027， China)

Abstract:Considering the wide frequency response range of PZT transducer, a multi-functional monitoring method was proposed, in which PZT transducer was used for strain measurement and acoustic emission monitoring simultaneously. The strain signal and acoustic emission signal of PZT transducer were separated by wavelet Mallat decomposition. The strain state of structure was monitored by the low frequency strain response of PZT transducer. At the same time, the damage condition of structure was evaluated and warned by the b value theory of acoustic emission. The dynamic failure monitoring test of reinforced concrete beams was carried out, and the feasibility of this method was verified. The results show that the low frequency voltage signal of PZT transducer is consistent with the strain signal of strain transducer, and the acoustic emission signal can accurately reflect the damage condition of structure.

Keywords:PZT transducer; Mallat decomposition; strain response; acoustic emission; b value theory