中文摘要：

针对土木工程结构健康监测，介绍了基于模态参数的损伤识别方法，分析依据模态参数获取结构刚度和柔度的条件，说明从一些低阶模态参数就可以获得柔度矩阵的精确估计值．提出一种利用柔度差曲率进行损伤定位与定量的新方法，通过对简支梁在不同损伤情况下的数值模拟验证了该方法的有效性，结果显示该法简单易行，具有一定的工程适用性．

英文摘要：

In this paper, damage detection based on modal analysis is investigated for engineering structural health monitoring, A study on the flexibility and stiffness of structure has been given. It is shown that the accurate estimation of the flexibility matrix can be obtained from the first lower modes A flexibility-matrix-based method which can be used to detected the location and severity of damage was introduced. The validation and simplicity of the proposed method are shown in numerical simulations of simply supported beam. The method based on curvature of flexibility difference matrix can locate damage accurately, and therefore, is feasible in engineering practice