發(fā)布時(shí)間：2019-01-08 11:07

【摘要】：傳統(tǒng)觀念上,人們總是認(rèn)為結(jié)構(gòu)中的鋼筋在混凝土的包裹下不易發(fā)生銹蝕,但混凝土中的鋼筋銹蝕是普遍存在的現(xiàn)象。隨著鋼筋銹蝕導(dǎo)致的工程事故日益增多,我們急需一種能監(jiān)測(cè)出結(jié)構(gòu)內(nèi)部鋼筋銹蝕程度的方法,以便能夠在工程實(shí)際中實(shí)時(shí)的監(jiān)測(cè)出鋼筋的銹蝕程度,避免形成重大的安全隱患和造成人身財(cái)產(chǎn)的損失,因此如何在結(jié)構(gòu)使用期間準(zhǔn)確監(jiān)測(cè)埋入混凝土內(nèi)部鋼筋的銹蝕狀況是一個(gè)極具挑戰(zhàn)性的課題。另外,鋼筋混凝土結(jié)構(gòu)中,鋼筋與混凝土的協(xié)同工作是依靠?jī)烧唛g的粘結(jié)力,為此,研究鋼筋銹蝕后鋼筋與混凝土的粘結(jié)滑移性能對(duì)了解結(jié)構(gòu)性能以及結(jié)構(gòu)耐久性有十分重要的工程實(shí)際意義。近些年,壓電陶瓷作為一種新型的智能材料,由于其易裁剪,響應(yīng)快,價(jià)格便宜等優(yōu)點(diǎn)在土木監(jiān)測(cè)領(lǐng)域得到了廣泛應(yīng)用。將壓電陶瓷應(yīng)用于工程結(jié)構(gòu)內(nèi)部鋼筋的無(wú)損監(jiān)測(cè)有著十分開闊的前景。本文就基于壓電陶瓷的鋼筋銹蝕監(jiān)測(cè)和銹蝕鋼筋混凝土粘結(jié)滑移展開了試驗(yàn)與數(shù)值模擬研究,主要工作如下:1、對(duì)變形鋼筋進(jìn)行基于PZT波傳播法的試驗(yàn)監(jiān)測(cè)和數(shù)值模擬,通過(guò)兩者對(duì)比分析,得出應(yīng)力波在變形鋼筋中的幅值變化隨激勵(lì)中心頻率以及傳播距離的影響規(guī)律,為混凝土內(nèi)部鋼筋銹蝕監(jiān)測(cè)試驗(yàn)提供依據(jù)。2、對(duì)電化學(xué)銹蝕后的鋼筋混凝土試件進(jìn)行壓電監(jiān)測(cè),對(duì)比不同銹蝕率下的信號(hào)幅值變化情況,得出在鋼筋銹蝕率較低的情況下,傳感器接收到的信號(hào)隨著銹蝕率的增高呈逐漸降低趨勢(shì)。但是隨著電化學(xué)銹蝕的進(jìn)行,鋼筋的銹蝕到一定程度后,接收到的信號(hào)將開始增大,兩者之間是二次函數(shù)的關(guān)系。3、對(duì)進(jìn)行波傳播法監(jiān)測(cè)后的鋼筋混凝土試件進(jìn)行拉拔試驗(yàn),得出隨著銹蝕率的增加,試件的極限粘結(jié)強(qiáng)度逐漸降低,粘結(jié)強(qiáng)度與銹蝕率之間存在著二次函數(shù)關(guān)系。4、通過(guò)模擬鋼筋混凝土試件的拉拔過(guò)程,驗(yàn)證在不同銹蝕率下鋼筋與混凝土的應(yīng)力變化情況,并與試驗(yàn)過(guò)程進(jìn)行對(duì)比驗(yàn)證,進(jìn)而確保試驗(yàn)得出的粘結(jié)滑移退化規(guī)律的正確性。
[Abstract]:In the traditional concept, people always think that the steel bars in the structure are not easy to rust under the concrete, but the corrosion of the reinforcement in the concrete is a common phenomenon. With the increasing number of engineering accidents caused by steel bar corrosion, we urgently need a method to monitor the corrosion degree of steel bar inside the structure, so that the corrosion degree of steel bar can be monitored in real time in engineering practice. Therefore, how to accurately monitor the corrosion of steel bars embedded in concrete during the use of the structure is a challenging subject. In addition, in reinforced concrete structures, the cooperative work of reinforcement and concrete depends on the bond between them. It is very important to study the bond-slip behavior of the corroded steel bar and concrete to understand the structural performance and the durability of the structure. In recent years, piezoelectric ceramics, as a new type of smart material, have been widely used in the field of civil engineering monitoring because of its advantages of easy cutting, fast response and low price. The application of piezoelectric ceramics in non-destructive monitoring of steel bars in engineering structures is very promising. In this paper, experiments and numerical simulation of corrosion monitoring and bond-slip of corroded reinforced concrete based on piezoelectric ceramics are carried out. The main work is as follows: 1. The experimental monitoring and numerical simulation of deformed steel bar based on PZT wave propagation method are carried out. Through the comparison and analysis of the two methods, the influence of the amplitude change of stress wave in the deformed steel bar with the frequency of the excitation center and the propagation distance is obtained, which provides the basis for the corrosion monitoring test of the steel bar inside the concrete. The piezoelectric monitoring of reinforced concrete specimens after electrochemical corrosion was carried out, and the variation of signal amplitude under different corrosion rates was compared. The results showed that the corrosion rate of steel bars was lower than that of steel bars. The signal received by the sensor decreases with the increase of corrosion rate. But with the electrochemical corrosion, when the corrosion of steel bar reaches a certain degree, the received signal will begin to increase, the relationship between the two is quadratic function. 3. Pull out test of reinforced concrete specimen after monitoring by wave propagation method. It is concluded that with the increase of corrosion rate, the ultimate bond strength of the specimen decreases gradually, and there is a quadratic function relationship between the bond strength and the corrosion rate. 4, by simulating the drawing process of the reinforced concrete specimen, The stress changes of steel bar and concrete under different corrosion rates are verified and compared with the experimental process to ensure the correctness of the bond-slip degradation law obtained from the test.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU375;TU317

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