Investigation Of Damage Detection Of Concrete Structure Using PZT Smart Rebar

The reinforced concrete structure is one of the most widely used form of building structure,the structure reliability,safety and stability is of vital importance to the healthy development of national economy and protect the public property,so it is of great significance using a means to monitor the safety of building structure.In recent years,PZT structural health monitoring theory has been extensively studied,and the application of PZT piezoelectric ceramics damage health monitoring has become the mainstream form of research on the structure of intelligent monitoring network in steel,the target of the technology research is to apply to largescale civil engineering structures.In the previous study using guided wave and PZT element,they were monitored for reinforced concrete system intelligent debonding of the damage form,we get the index system in the relationship between intelligent steel output signal and debonding size,at the same time on the concrete guide wave propagation is studied using the finite element software ANSYS and experiment to test principle of intelligent steel system damage of concrete single and multiple fractures.Based on the above research,through the method of experiment and simulation to research and study on crack damage of reinforced concrete members,especially work on reinforced concrete column crack influence on signal transmission beam,and the reinforced concrete cross beam prefabricated oblique crack effects on signal transmission,the main research work includes the following aspects:(1)This paper introduces some trends and status in the field of building structure monitoring in recent years,and studies the basic theory of PZT structure health monitoring,and lays the foundation for this research by combining the guided stress wave method of PZT and active monitoring method.(2)By setting up a series of prefabricated diagonal cracks by different depth,we can get relevant amplitude damage degree according to the relevant data,and get the relevant conclusions by comparing the horizontal amplitude and longitudinal comparison with standardized amplitude.Then,a large-scale finite element software is used to simulate the structure form and damage by establishing a certain model.The simulation results agree well with the experimental results.The experimental results show that the signal weakening degree in the basic structure shows a linear increasing relationship with the increase of the prefabricated diagonal crack depth.(3)In the laboratory we precast concrete poured specimens,according to the space position of the segment of the PZT pathway and the detection of diagonal cracks into two categories,one for the inclined crack does not pass through the detection path,we called the first pathway,another pathway through the detection for diagonal cracks,we called the second pathway,by contrast it can be obtained between the various subjects signal amplitude and depth of the damage.(4)On the construction of institutions of specific nondestructive crack damage damage monitoring technology are analyzed,including the analysis of qualitative research and qualitative research,also including research and positioning the cracks exist,including quantitative analysis of crack damage form formula and summarizing the conclusion based on the above analysis...