基于动态测量数据损伤定位识别的比较研究

A Comparative Study of Identifying Structural Damage Location Based on Dynamic Measurement Data

动态测量数据经模态分析可得到结构动态参数,通过结构动态参数的变化能识别土木工程结构中的损伤。利用模态柔度、曲率模态和模态柔度曲率3种损伤定位识别方法的基本原理,以模态柔度差、曲率模态差和模态柔度曲率差为识别参数对简支梁结构损伤定位进行了数值模拟的对比分析。结果表明,当结构单处损伤时,3种参数均能有效识别损伤位置,当结构多处损伤时,曲率模态差和模态柔度曲率差比模态柔度差具有更好的识别精度。

The structural dynamic parameters can be obtained by modal analysis of dynamic measurement data, and the change of the obtained parameters can thereby identify the struc- tural damage location in civil engineering. Three fundamental theories of identifying damage lo- cation are presented, that is, modal flexibility, curvature mode and modal flexibility curva- ture. Using the change in modal flexibility, the change in curvature mode and the change in modal flexibility curvature as identifying parameters, comparative studies are carried out by numerical simulation of one simply supported beam. The results show that each of the three methods is effective in identifying single damage location while the change in curvature mode and the change in modal flexibility curvature are more accurate for multiple damage locations than the change in modal flexibility.