Crack damage identification index of concrete dam based on transmissibility function and information entropy
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Abstract:
In the process of operation, the concrete dam’s vibration information is hard to be measured accurately, based on transmissibility function, the vibration excitation was applied to the concrete dam, and transmissibility function is established through the dynamic response information. In addition, the information characteristics and the correlation of the variable can be characterized by the information entropy and mutual information, based on that, a new identification and localization of structural damage index is presented. This method extracts damage character without obtaining the outside vibration excitation information. Concrete gravity dam of the simulation and experimental results show that while the damage degree is greater than 3%, applying the vibration excitation can well realize the damage identification, and it is suitable for single damage and multiple damaged. The local damage can be well identified by reasonable arrangement of the measuring points according to the structural characteristics, and with great practical application value in concrete dam’s damage identification.
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