采用应变模态柔度曲率差识别结构损伤

用随机子空间法从结构的响应信号中提取模态参数，构建模态柔度曲率差MFC进行损伤识别.通过简支梁线单元模型仿真算例，对比了位移模态与应变模态识别损伤的效果，并由实体单元模型仿真算例考察了应变信号采集位置对损伤识别效果的影响.结果表明，应变模态应用于损伤识别在抵抗噪声方面优于位移模态，但应变信号的测点需要靠近损伤的位置.

Structural Damage Identification Based on Strain Modal Flexibility Curvature

Stochastic subspace identification was utilized to extract modal parameters from the structural response signals,by which the modal flexibility curvature (MFC) was constructed to detect structural damage.A numerical model of simple beam using line elements was employed to compare the results between the displacement modes and strain modes by means of the above procedure.In addition,a simple beam model constructed by solid elements was also used to investigate the effect of recorded locations of strain signals on the damage identification.The results show that the strain modes are better than displacement modes in locating damage under the effect of noise;however,the recorded places of strain signals should be near the damaged parts.