基于壓電阻抗的鋼骨混凝土結(jié)構(gòu)界面缺陷監(jiān)測(cè)研究
[Abstract]:In recent years, the super high rise building in China has developed rapidly and a lot of super high rise height is over 600 meters. The steel reinforced concrete column has been widely used in the construction of super high rise building vertical bearing members in recent years because of its high bearing capacity, good deformability and ductility and strong energy dissipation under the earthquake. The cross section of the soil column is often large, so the pre buried steel is mostly used in the form of the vertical steel plate and the complex multi cavity structure of the diaphragm. Due to the shrinkage of the consolidation of the mass concrete and its own defects, the steel bone concrete column in the form of multi cavity is easily stripped of the buried steel or the diaphragm and the core concrete. The method can not effectively monitor the defects of steel reinforced concrete. How to effectively identify the defects of the interface has become one of the more and more important problems in the application of steel reinforced concrete. This paper presents a kind of mechatronic impedance method based on the bonding type piezoelectric ceramic sensor and the pre embedded piezoelectric function element to the large multi cavity steel bone. A method of identifying the interfacial debonding damage of concrete columns. Through the graphic analysis of the impedance data collected by a piezoelectric ceramic sensor, the mean square root difference is used as the damage index to analyze the damage. The results show that the defined damage index can identify the interfacial debonding damage well. This study is a large multi cavity steel reinforced concrete interface. The main contents of this paper are as follows: (1) the development and application background of electromechanical coupled impedance method based on piezoelectric ceramics are introduced. The characteristics of piezoelectric ceramic materials and the structure health monitoring method based on piezoelectric ceramics are briefly introduced. The mechanical coupled impedance method is described in detail. The principle and electromechanical coupling impedance test system (2) a large column scale model monitoring test of steel reinforced concrete with complex cross section based on piezoelectric ceramics is carried out. The damage monitoring of steel reinforced concrete test columns is monitored by artificial interface stripping defects. The results show that the impedance method can effectively identify the interfacial stripping defects. (3 The experimental results show that the first monitoring and retest results are in good agreement, indicating that the interfacial bonding performance of the steel reinforced concrete column is better, and the piezoelectric ceramic and the embedded piezoelectric functional element can be better held in the steel reinforced concrete. Continuous work can meet the requirements of long-term and real-time monitoring of structural health monitoring.
【學(xué)位授予單位】:湖南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TU398.9;TU317
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