Damage Monitoring of L-shaped Concrete-filled Steel Tubular Column Steel Beam Joint with Floor Slab Based on Piezoelectric Sensor
A real-time monitoring method for damage of beam column joints based on piezoelectric intelligent aggregate is proposed.Three L-shaped concrete-filled steel tube column-steel beam joint specimens were made with the axial compression ratio of the column as the variable.A pair of piezoelectric ceramic sensors were embedded in the core area of the specimen joint,and the horizontal low cycle reciprocating test was carried out on the top of the specimen.By comparing the amplitude of piezoelectric signals received by sensors at different loading stages,real-time monitoring of damage in the core area of nodes is realized.In order to make the damage state more accurate and intuitive,the mean square error method is used to establish the damage index on the basis of wavelet packet analysis and quantify it.The results show that the experimental phenomena are consistent with the monitoring results.This method can effectively monitor the L-shaped concrete-filled steel tubular column-steel beam joint specimens in real time.
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