本文選題：聲發(fā)射 + 預(yù)應(yīng)力混凝土��； 參考：《長(zhǎng)沙理工大學(xué)》2015年碩士論文

【摘要】：聲發(fā)射技術(shù)作為當(dāng)前一種新型的被動(dòng)無損檢測(cè)技術(shù),其原理簡(jiǎn)單,具有實(shí)時(shí)、動(dòng)態(tài)、方便、直觀、連續(xù)等優(yōu)點(diǎn),廣泛的應(yīng)用于材料的性能和結(jié)構(gòu)損傷的評(píng)價(jià)中,能夠?qū)Y(jié)構(gòu)的安全性能和損傷程度進(jìn)行很好的預(yù)警和評(píng)判。本文利用聲發(fā)射技術(shù)對(duì)預(yù)應(yīng)力混凝土結(jié)構(gòu)實(shí)驗(yàn)中的聲發(fā)射特性進(jìn)行了探索和研究。主要研究?jī)?nèi)容和研究成果:(1)在預(yù)應(yīng)力簡(jiǎn)支T梁嘗試進(jìn)行聲發(fā)射特性實(shí)驗(yàn)研究,對(duì)聲發(fā)射參數(shù)隨時(shí)間分布進(jìn)行了分析,監(jiān)測(cè)了主梁的開裂時(shí)間點(diǎn),發(fā)現(xiàn)了裂紋的出現(xiàn)對(duì)聲波檢測(cè)存在一定的影響;應(yīng)用了線性定位技術(shù),發(fā)現(xiàn)其可以很好的對(duì)裂紋位置進(jìn)行定位。(2)在預(yù)應(yīng)力簡(jiǎn)支箱梁實(shí)驗(yàn)應(yīng)用了聲發(fā)射技術(shù),對(duì)聲發(fā)射參數(shù)隨時(shí)間分布進(jìn)行分析,發(fā)現(xiàn)其可以很好的描述主梁內(nèi)的裂紋擴(kuò)展情況;進(jìn)行了聲發(fā)射參數(shù)關(guān)聯(lián)分析研究,發(fā)現(xiàn)能量隨平均頻率和事件隨幅值的分布隨荷載的變化規(guī)律,得到了幅值隨平均頻率的分布規(guī)律;應(yīng)用了平面二維定位技術(shù),通過對(duì)比分析發(fā)現(xiàn)了該技術(shù)對(duì)多裂紋可以進(jìn)行較好的定位。(3)預(yù)應(yīng)力混凝土斜拉橋主梁上利用聲發(fā)射技術(shù)進(jìn)行了實(shí)驗(yàn)監(jiān)測(cè),通過對(duì)聲發(fā)射參數(shù)隨時(shí)間的分布,發(fā)現(xiàn)了主梁的開裂時(shí)間點(diǎn)和失穩(wěn)破壞點(diǎn),該兩個(gè)特征可以作為彈性體系支撐工程結(jié)構(gòu)開裂和破壞的預(yù)警;通過對(duì)比分析能量-平均頻率的分布圖,發(fā)現(xiàn)鋼筋屈服后,主梁釋放的聲波攜帶大量的低頻聲波;主梁失穩(wěn)階段,主梁釋放的聲波信號(hào)攜帶大量的中低頻聲波,主梁破壞的瞬間釋放大量的高能和中高頻的聲波信號(hào);同時(shí)使用了線性定位技術(shù)和平面二維定位技術(shù),發(fā)現(xiàn)二者分別可以對(duì)沿梁縱向和局部的裂紋擴(kuò)展情況進(jìn)行定位和描述。
[Abstract]:Acoustic emission (AE) technology, as a new passive nondestructive testing technology, has the advantages of simple principle, real-time, dynamic, convenient, intuitive and continuous. It is widely used in the evaluation of material properties and structural damage. It can predict and judge the safety performance and damage degree of the structure. In this paper, acoustic emission characteristics of prestressed concrete structures are studied by acoustic emission technique. The main research contents and research results are as follows: (1) the experimental study on acoustic emission characteristics of prestressed simply supported T beam is carried out. The distribution of acoustic emission parameters with time is analyzed, and the crack time point of the main beam is monitored. It is found that the occurrence of cracks has a certain influence on acoustic wave detection, and the linear positioning technique is used, which can locate the crack position well. (2) the acoustic emission technology is used in the experiment of prestressed simply supported box girder. By analyzing the distribution of acoustic emission parameters with time, it is found that the acoustic emission parameters can well describe the crack propagation in the main beam, and the correlation analysis of acoustic emission parameters is carried out. It is found that the distribution of energy with the average frequency and the distribution of the event with the amplitude varies with the load, and the distribution of the amplitude with the average frequency is obtained. By comparison and analysis, it is found that the technique can be used to locate multi-cracks in the main girder of prestressed concrete cable-stayed bridge. Acoustic emission technique is used to carry out experimental monitoring, and the distribution of acoustic emission parameters with time is analyzed. The cracking time point and the failure point of the main beam are found. These two characteristics can be used as early warning for cracking and failure of the bracing engineering structure of elastic system, and by comparing and analyzing the distribution diagram of energy and average frequency, it is found that after the steel bar yield, The acoustic waves released by the main beam carry a large number of low frequency sound waves, the acoustic signals released by the main beam carry a large number of medium and low frequency sound waves at the stage of the main beam instability, and a large number of high energy and high frequency acoustic signals are released at the moment of the main beam failure. At the same time, the linear positioning technique and the planar two-dimensional positioning technique are used to locate and describe the crack propagation along the longitudinal and local beams, respectively.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U446

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