基于ERA算法的结构损伤识别及试验研究

针对多孔砖砌体结构，分别进行了理论计算、有限元分析及其基于特征值实现法（ERA）的模态实验分析，通过对比表明3种方法分析的结果较为吻合，说明了识别的结果的正确性。根据识别出的频率，得出了损伤前后的变化规律，说明随着墙体的开裂，刚度迅速下降，极限荷载以后刚度衰减趋于平缓，表明损伤识别分析结果与多孔砖砌体压剪实验结果一致。

Tentative Studies and the Structural Damage Identification Based on ERA

In this paper, theoretical calculation, finite element analysis and modal analysis are carried out based on ERA for the masonry structure of the perforated block. The comparisons show that the analysis result of three methods is highly consistent, and the identification result is cerrect. According to the identification frequency, the rule of the stiffness changing fore and after structural damage is obtained by calculating and analyzing, and it indicates that the stiffness decreases rapidly following with the wall's crack, the stiffness degradation becomes flat after ultimate loaded, and the analysis results of damage identification are in good agreement with experimental results.