基于压电陶瓷传感器的混凝土结构健康监测技术的数值模拟研究

Numerical simulation of damage detection on concrete structure based on PZT transducer

研究混凝土梁在损伤程度相同的情况下,损伤位置与压电陶瓷(PZT)距离同结构导纳的均方根(root-mean-square deviation,RMSD)之间的关系。以及在损伤位置与PZT距离相等的情况下,不同的损伤程度与RMSD指标之间的关系。运用大型有限元通用软件建立了贴有PZT传感器的混凝土损伤梁模型,并对混凝土梁在各种损伤前后的变化进行数值分析,利用RMSD指标评定其损伤程度。结果表明在损伤程度相同的情况下,损伤判定的RMSD指标随损伤位置与PZT之间的距离增大有减小的趋势;在损伤位置与PZT距离相同的情况下,RMSD指标随损伤程度的增加有增大的趋势。同时也证明了利用有限元软件对基于PZT传感器的混凝土结构损伤检测的数值模拟是可行的。

It was carefulby reseached that the relationship between RMSD index and the distance of PZT and damage location when damage degree,and the relationship between RMSD index and the damage degree when the distance of PZT and damage location.Based on FEM theory,the process of damage detection in a concrete beam with PZT transducers was numerically simulated by FEM software.The numerical results show that the RMSD index had a tendency of both reducing with the increase of distance between PZT and damage location when damage degree increased with the aggravation ,and the distance of PZT and damage location exist for aperiod.Meantime ,the efficiency of the proposed method was evaluated and validated.