earticle

영어

Various smart sensors have been used for the monitoring of damage predication of structures. In this study, piezoelectric (PZT) sensors were used for the damage prediction of steel member. An impact load was applied on a simply supported steel girder on which PATs were attached, and the dynamic responcd were measured. The voltage change of piezoelectric for the steel
girder is used for damage prediction. Damage measuring of steel girder will use the change of voltage of the PZT sensor and it will be able to predict a damage. The measured natural frequency were compared with those of both theorerical analysis as well as those of numerical analysis results using finite element analysis program Midas The damage of steel girder was
manipulated by the bolt loosening of ioint with bolt slice. The voltages from PZT sensor were converted to FFT data and the frequency change and magnitude were inspected to identify the damage. The basic data to identify the damage of steel girder were suggested based on the frequency change and magnitude ratio for the different modes.