本文選題：壓電智能骨料 + 波動法��； 參考：《大連理工大學(xué)》2013年碩士論文

【摘要】：建筑結(jié)構(gòu)地震損傷將造成重大人員傷亡及財產(chǎn)損失,然而現(xiàn)有結(jié)構(gòu)損傷過程監(jiān)測手段存在價格昂貴、極端條件下存活率低等問題,都無法有效獲得地震過程中的結(jié)構(gòu)損傷變化過程�；谝陨显�,本文提出了基于壓電智能骨料(Smart Aggregate,簡稱“SA”)的混凝土結(jié)構(gòu)損傷主動監(jiān)測方法,主要從以下幾個方面進(jìn)行了研究： (1)首先,研究了石基SA的在混凝土介質(zhì)中所發(fā)送和接收信號的重復(fù)性。將SA布設(shè)在了混凝土梁中,采用兩個傳感器相互發(fā)送與接收的模式研究了在相同傳播介質(zhì)中,不同SA之間的發(fā)送與接收信號的一致性,研究表明本文使用的石基SA具有良好的可重復(fù)性。 (2)其次,本文通過實(shí)驗(yàn)對比了石基SA與文獻(xiàn)中常用的水泥基SA兩種傳感器的性能特性。通過在混凝土構(gòu)件相同位置成對布置石基與水泥基SA,使它們的波動傳播介質(zhì)相同,再通過對比所接收到的信號證明了本文使用的石基SA主動監(jiān)測可重復(fù)性更好,信噪比更高,更適合作為主動損傷監(jiān)測的傳感器。 (3)再次,提出了混凝土結(jié)構(gòu)小數(shù)據(jù)量主動損傷監(jiān)測方法。利用labview程序搭建了混凝土結(jié)構(gòu)小數(shù)據(jù)量主動損傷監(jiān)測系統(tǒng)。該系統(tǒng)主要由NI高頻信號采集儀、NI信號發(fā)生器、功率放大器和SA傳感器四個主要組成部分構(gòu)成。該系統(tǒng)是通過對混凝土梁進(jìn)行波動掃頻分析,從而找出對結(jié)構(gòu)損傷敏感且接收信號較大的頻率,并以該頻率作為主動發(fā)射的頻率,在固定的時間間隔內(nèi),自動發(fā)送和采集毫秒級這一頻率的聲波。通過實(shí)時監(jiān)測不同時刻波動信號的幅值變化情況,來實(shí)現(xiàn)對混凝土結(jié)構(gòu)內(nèi)部損傷情況的實(shí)時監(jiān)測。以該種方式進(jìn)行主動損傷監(jiān)測可大大減少SA所需要接收的數(shù)據(jù)量,且可實(shí)現(xiàn)連續(xù)損傷過程的主動監(jiān)測。 (4)通過構(gòu)件損傷試驗(yàn)驗(yàn)證了本文提出的小數(shù)據(jù)量結(jié)構(gòu)損傷監(jiān)測方法的有效性。針對混凝土梁構(gòu)件的鋸口損傷及壓彎柱構(gòu)件的開裂損傷進(jìn)行了構(gòu)件試驗(yàn)研究,建立了接收信號幅值變化與損傷程度的關(guān)系,研究表明該小數(shù)據(jù)量監(jiān)測方式的可行性與有效性。
[Abstract]:Earthquake damage of building structure will cause heavy casualties and property losses. However, the existing monitoring methods of structural damage process are expensive, and the survival rate is low under extreme conditions. Neither of them can effectively obtain the structural damage change process during earthquake. For the above reasons, this paper presents an active damage monitoring method for concrete structures based on piezoelectric smart aggregate (SA), which is mainly studied from the following aspects: Firstly, the repeatability of the signals transmitted and received in concrete medium by stone based SA is studied. The SA is arranged in the concrete beam and the transmission and reception modes of two sensors are used to study the consistency of the transmission and reception signals between different SA in the same transmission medium. The results show that the stone base SA used in this paper has good reproducibility. Secondly, the performance characteristics of stone based SA and cement based SA are compared experimentally. By arranging stone foundation and cement base SAs in pairs in the same position of concrete members, the wave propagation medium is the same, and the comparison of received signals proves that the stone base SA active monitoring is more reproducible and signal-to-noise ratio is higher. It is more suitable as a sensor for active damage monitoring. Thirdly, an active damage monitoring method for concrete structures with small amount of data is proposed. A small amount of active damage monitoring system for concrete structures is built by using labview program. The system is composed of NI signal generator, power amplifier and SA sensor. By analyzing the wave sweep frequency of concrete beam, the system finds out the frequency which is sensitive to structural damage and receives large signal, and takes this frequency as the frequency of active emission, within a fixed time interval. Automatic transmission and acquisition of millisecond sound waves at this frequency. The real-time monitoring of the internal damage of concrete structures is realized by monitoring the amplitude of the fluctuation signals at different times in real time. Active damage monitoring in this way can greatly reduce the amount of data received by SA and realize active monitoring of continuous damage process. 4) the effectiveness of the method proposed in this paper is verified by the structural damage test. In this paper, the experimental study on the sawing damage of concrete beam members and the cracking damage of the bending column members is carried out, and the relationship between the amplitude change of the received signal and the damage degree is established. The results show that the small data monitoring method is feasible and effective.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375;TU317

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 蒙彥宇;關(guān)海爽;郭增年;賈梁海;;壓電智能骨料傳感器設(shè)計與性能研究[J];壓電與聲光;2015年06期

相關(guān)博士學(xué)位論文 前1條

1 張海濱;鋼筋混凝土結(jié)構(gòu)地震損傷的壓電骨料應(yīng)力監(jiān)測與模型修正[D];大連理工大學(xué);2016年

相關(guān)碩士學(xué)位論文 前3條

1 鄭合營;基于壓電智能骨料的混凝土結(jié)構(gòu)損傷主動監(jiān)測研究[D];大連理工大學(xué);2016年

2 李蘭;基于壓電傳感器的混凝土結(jié)構(gòu)中鋼筋銹蝕監(jiān)測研究[D];濟(jì)南大學(xué);2015年

3 謝新春;壓電超聲傳感器的制備及其在混凝土結(jié)構(gòu)健康監(jiān)測中的應(yīng)用[D];濟(jì)南大學(xué);2014年

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本文編號：1990724