【摘要】：傳統(tǒng)觀念上,人們總是認為結(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,以便能夠在工程實際中實時的監(jiān)測出鋼筋的銹蝕程度,避免形成重大的安全隱患和造成人身財產(chǎn)的損失,因此如何在結(jié)構(gòu)使用期間準確監(jiān)測埋入混凝土內(nèi)部鋼筋的銹蝕狀況是一個極具挑戰(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)同工作是依靠兩者間的粘結(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,價格便宜等優(yōu)點在土木監(jiān)測領(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)部鋼筋的無損監(jiān)測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)測和銹蝕鋼筋混凝土粘結(jié)滑移展開了試驗與數(shù)值模擬研究,主要工作如下:1、對變形鋼筋進行基于PZT波傳播法的試驗監(jiān)測和數(shù)值模擬,通過兩者對比分析,得出應(yīng)力波在變形鋼筋中的幅值變化隨激勵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)測試驗提供依據(jù)。2、對電化學(xué)銹蝕后的鋼筋混凝土試件進行壓電監(jiān)測,對比不同銹蝕率下的信號幅值變化情況,得出在鋼筋銹蝕率較低的情況下,傳感器接收到的信號隨著銹蝕率的增高呈逐漸降低趨勢。但是隨著電化學(xué)銹蝕的進行,鋼筋的銹蝕到一定程度后,接收到的信號將開始增大,兩者之間是二次函數(shù)的關(guān)系。3、對進行波傳播法監(jiān)測后的鋼筋混凝土試件進行拉拔試驗,得出隨著銹蝕率的增加,試件的極限粘結(jié)強度逐漸降低,粘結(jié)強度與銹蝕率之間存在著二次函數(shù)關(guān)系。4、通過模擬鋼筋混凝土試件的拉拔過程,驗證在不同銹蝕率下鋼筋與混凝土的應(yīng)力變化情況,并與試驗過程進行對比驗證,進而確保試驗得出的粘結(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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU375;TU317

【參考文獻】

相關(guān)期刊論文 前10條

1 逯彥秋;安關(guān)峰;程進;;基于主動導(dǎo)波的鋼筋銹蝕識別技術(shù)[J];北京工業(yè)大學(xué)學(xué)報;2014年06期

2 蔡金標;吳濤;陳勇;;基于壓電阻抗技術(shù)監(jiān)測混凝土強度發(fā)展的實驗研究[J];振動與沖擊;2013年02期

3 曾嚴紅;顧祥林;張偉平;黃慶華;;混凝土中鋼筋加速銹蝕方法探討[J];結(jié)構(gòu)工程師;2009年01期

4 彭鴿,袁慎芳,徐穎娣;基于主動Lamb波和小波變換的二維結(jié)構(gòu)損傷定位研究[J];振動工程學(xué)報;2004年04期

5 徐穎娣,袁慎芳,彭鴿;二維結(jié)構(gòu)損傷的主動Lamb波定位技術(shù)研究[J];航空學(xué)報;2004年05期

6 金偉良,趙羽習;混凝土結(jié)構(gòu)耐久性研究的回顧與展望[J];浙江大學(xué)學(xué)報(工學(xué)版);2002年04期

7 張偉平,張譽;銹脹開裂后鋼筋混凝土粘結(jié)滑移本構(gòu)關(guān)系研究[J];土木工程學(xué)報;2001年05期

8 淡丹輝,王慶霖;鋼筋混凝土結(jié)構(gòu)銹脹裂縫的計算機模擬[J];西南交通大學(xué)學(xué)報;2000年05期

9 張國學(xué),宋建夏,劉曉航;鋼筋銹蝕對鋼筋混凝土構(gòu)件粘結(jié)力的影響[J];工業(yè)建筑;2000年02期

10 袁迎曙,余索,賈福萍;銹蝕鋼筋混凝土的粘結(jié)性能退化的試驗研究[J];工業(yè)建筑;1999年11期

相關(guān)博士學(xué)位論文 前5條

1 張永利;銹蝕鋼筋混凝土構(gòu)件粘結(jié)性能及承載性能研究[D];西安建筑科技大學(xué);2011年

2 孫威;利用壓電陶瓷的智能混凝土結(jié)構(gòu)健康監(jiān)測技術(shù)[D];大連理工大學(xué);2009年

3 趙曉燕;基于壓電陶瓷的結(jié)構(gòu)健康監(jiān)測與損傷診斷[D];大連理工大學(xué);2008年

4 鄭曉燕;銹蝕鋼筋與混凝土動態(tài)粘結(jié)性能研究[D];河海大學(xué);2004年

5 仲偉秋;既有鋼筋混凝土結(jié)構(gòu)的耐久性評估方法研究[D];大連理工大學(xué);2003年

相關(guān)碩士學(xué)位論文 前1條

1 徐育才;鋼筋銹蝕拉拔試驗及其粘結(jié)性能研究[D];華中科技大學(xué);2006年

，

本文編號：2404522