中文摘要：

通过在结构的某些部位附加已知的集中质量块，测量附加质量后结构振动的低阶模态，把这些新的模态参数及原结构的模态参数联合起来，通过广义柔度灵敏度来建立损伤识别方程求解损伤参数。以一个桁架结构为例对所提的方法进行验证。研究结果表明，仅需要测量原结构和附加质量后结构的第一阶模态信息就可以比较准确地识别出结构的损伤，说明了所提方法的可行性，为解决大型结构的损伤识别问题提供了一条可供参考的途径。

英文摘要：

In this study, a method is proposed to identify structural damages by the change of structural generalized flexibility. By adding known masses to the physical structure, measuring the lower modes of the mass-modified structure, and then using these new data as well as the original test information, structural damages can be detected using the generalized flexibility perturbation technique. The effectiveness of the proposed method is illustrated using simulated data on a plane truss structure. The results show that the proposed method can identify structural damages accurately only using the first modal parameters. The presented scheme may be useful for damage identification of large-scale structures.