Application of Wide Band AE Sensor in Model Test of Reinforced Concrete Structures

摘要

Due to the complicated components of the reinforced concrete, the AE signals produced by the structural model under different loads possess their different characteristics in the time domain and frequency domain. This paper introduces the application of the Model AE-011 Acoustic Emission Test System with its wide band AE sensors to acquire and process the AE signals emitted from the reinforced concrete structure and I-steel specimen under different loads. When the health situation of the structures changes under the load, there is not only the obvious difference on the duration and event count of the AE signal, but also the affinity between the frequency character and the health situation of the structure. When the reinforcing steel bar or metal part of the structure also has the serious deformation, the high frequency component of the signal may reach above 1MHz. The results indicate that it is helpful for the comprehensive and thorough analysis of the damage mechanism of the structure by using the wide band AE sensor in the health monitoring of the reinforced concrete structures.