基于压电陶瓷传感器的混凝土内部钢筋锈蚀监测及其粘结滑移性能研究
发布时间：2019-01-08 11:07
【摘要】：传统观念上,人们总是认为结构中的钢筋在混凝土的包裹下不易发生锈蚀,但混凝土中的钢筋锈蚀是普遍存在的现象。随着钢筋锈蚀导致的工程事故日益增多,我们急需一种能监测出结构内部钢筋锈蚀程度的方法,以便能够在工程实际中实时的监测出钢筋的锈蚀程度,避免形成重大的安全隐患和造成人身财产的损失,因此如何在结构使用期间准确监测埋入混凝土内部钢筋的锈蚀状况是一个极具挑战性的课题。另外,钢筋混凝土结构中,钢筋与混凝土的协同工作是依靠两者间的粘结力,为此,研究钢筋锈蚀后钢筋与混凝土的粘结滑移性能对了解结构性能以及结构耐久性有十分重要的工程实际意义。近些年,压电陶瓷作为一种新型的智能材料,由于其易裁剪,响应快,价格便宜等优点在土木监测领域得到了广泛应用。将压电陶瓷应用于工程结构内部钢筋的无损监测有着十分开阔的前景。本文就基于压电陶瓷的钢筋锈蚀监测和锈蚀钢筋混凝土粘结滑移展开了试验与数值模拟研究,主要工作如下:1、对变形钢筋进行基于PZT波传播法的试验监测和数值模拟,通过两者对比分析,得出应力波在变形钢筋中的幅值变化随激励中心频率以及传播距离的影响规律,为混凝土内部钢筋锈蚀监测试验提供依据。2、对电化学锈蚀后的钢筋混凝土试件进行压电监测,对比不同锈蚀率下的信号幅值变化情况,得出在钢筋锈蚀率较低的情况下,传感器接收到的信号随着锈蚀率的增高呈逐渐降低趋势。但是随着电化学锈蚀的进行,钢筋的锈蚀到一定程度后,接收到的信号将开始增大,两者之间是二次函数的关系。3、对进行波传播法监测后的钢筋混凝土试件进行拉拔试验,得出随着锈蚀率的增加,试件的极限粘结强度逐渐降低,粘结强度与锈蚀率之间存在着二次函数关系。4、通过模拟钢筋混凝土试件的拉拔过程,验证在不同锈蚀率下钢筋与混凝土的应力变化情况,并与试验过程进行对比验证,进而确保试验得出的粘结滑移退化规律的正确性。
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375;TU317
本文编号：2404522
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375;TU317
【参考文献】
相关期刊论文 前10条
1 逯彦秋;安关峰;程进;;基于主动导波的钢筋锈蚀识别技术[J];北京工业大学学报;2014年06期
2 蔡金标;吴涛;陈勇;;基于压电阻抗技术监测混凝土强度发展的实验研究[J];振动与冲击;2013年02期
3 曾严红;顾祥林;张伟平;黄庆华;;混凝土中钢筋加速锈蚀方法探讨[J];结构工程师;2009年01期
4 彭鸽,袁慎芳,徐颖娣;基于主动Lamb波和小波变换的二维结构损伤定位研究[J];振动工程学报;2004年04期
5 徐颖娣,袁慎芳,彭鸽;二维结构损伤的主动Lamb波定位技术研究[J];航空学报;2004年05期
6 金伟良,赵羽习;混凝土结构耐久性研究的回顾与展望[J];浙江大学学报(工学版);2002年04期
7 张伟平,张誉;锈胀开裂后钢筋混凝土粘结滑移本构关系研究[J];土木工程学报;2001年05期
8 淡丹辉,王庆霖;钢筋混凝土结构锈胀裂缝的计算机模拟[J];西南交通大学学报;2000年05期
9 张国学,宋建夏,刘晓航;钢筋锈蚀对钢筋混凝土构件粘结力的影响[J];工业建筑;2000年02期
10 袁迎曙,余索,贾福萍;锈蚀钢筋混凝土的粘结性能退化的试验研究[J];工业建筑;1999年11期
相关博士学位论文 前5条
1 张永利;锈蚀钢筋混凝土构件粘结性能及承载性能研究[D];西安建筑科技大学;2011年
2 孙威;利用压电陶瓷的智能混凝土结构健康监测技术[D];大连理工大学;2009年
3 赵晓燕;基于压电陶瓷的结构健康监测与损伤诊断[D];大连理工大学;2008年
4 郑晓燕;锈蚀钢筋与混凝土动态粘结性能研究[D];河海大学;2004年
5 仲伟秋;既有钢筋混凝土结构的耐久性评估方法研究[D];大连理工大学;2003年
相关硕士学位论文 前1条
1 徐育才;钢筋锈蚀拉拔试验及其粘结性能研究[D];华中科技大学;2006年
，本文编号：2404522
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2404522.html
