The Application Of Piezoelectric Smart Materials In Dynamic Monitoring Of Concrete Structure

In recent decades, a large number of engineering structures under complex dynamic loads have emerged around people. Therefore, it is important content of the structure health monitoring to evaluate the dynamic characteristics of structures effectively. In engineering experiment, the study of dynamic characteristics of structures is much more complex than that of the other structure performance indexes. So whether the dynamic characteristics of a structure can be effectively monitored has become the most urgent task at present.Along with the coming of the severe situation of structural health monitoring, many monitoring techniques are proposed by relevant personages, such as ultrasonic testing, acoustic emission technology and so on. But these monitoring methods have many shortcomings, such as low efficiency, complex operation, high cost, regular artificial monitoring and unable to realize intelligent etc. Smart piezoelectric sensors, with the excellent characteristics of fast response, low cost and simple processing, are used more and more widely in structural health monitoring and have laid the good theoretical and practical foundation for its application in dynamic concrete structure monitoring. For concrete structure stress monitoring, piezoelectric sensors should be embedded inside the concrete. Embedded piezoelectric sensors have many advantages, such as high durability, high sensitivity, anti-interference etc.On this background, based on the embedded piezoelectric sensors, the response of concrete structure under dynamic loads was monitored and whether the embedded piezoelectric sensors meet the needs of the monitoring was verified in this paper. The research achievements can be summarized as following1) Review on the overseas and domestic research status of the dynamic characteristics of structures and the situation of the research and application of piezoelectric technology in the studies of building structures;2) Based on the basic principle of piezoelectric ceramic technology, the test of concrete blocks with the MTS sine loading was conducted, to demarcate the excellent characteristics of embedded piezoelectric sensors, such as linear output, frequency response etc.;3) Dynamic load tests of the steel cantilever beam and concrete cantilever beam were conducted to study the characteristics of the piezoelectric sensors mentioned above under the sine loads, and the concrete cantilever beams in the damage condition were monitored to study the function of the embedded sensors in monitoring the damage of concrete structure;4) The dynamic test of the concrete frame was conducted to study the same characteristics of piezoelectric sensors under the transient impact loads and the damaged frame was monitored to study the function of the embedded piezoelectric sensor in monitoring the damage of concrete structure;Analyzing the tests above, it shows that the embedded piezoelectric sensors can monitor the dynamic characteristics of the concrete structure, and reflect the structural damage state.