School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
Sensors (Basel). 2018 Dec 15;18(12):4446. doi: 10.3390/s18124446.
The diagnosis of damage in a bridge superstructure using quasi-static strain influence lines (ILs) is promising. However, it is challenging to accurately localize the damage in a bridge superstructure due to limited numbers of strain IL measurement points and inconsistencies between the loading conditions before and after damage. To address the above issues, the Brillouin optical time domain analysis (BOTDA) technique is first applied to bridge damage localization using quasi-static strain ILs, and the number of strain IL measurement points is substantially increased. Additionally, a damage localization index based on quasi-static strain ILs that is independent of differences in the loading conditions before and after damage is proposed to localize damage in the superstructure of a beam bridge. Finally, the effectiveness of the proposed method is demonstrated through both numerical analysis and measured data from a quasi-static test of a model bridge.
使用准静态应变影响线（IL）诊断桥梁上部结构的损伤具有很大的发展潜力。然而，由于应变 IL 测量点的数量有限，以及损伤前后加载条件的不一致，准确地定位桥梁上部结构的损伤具有一定的挑战性。为了解决上述问题，首次将布里渊光时域分析（BOTDA）技术应用于基于准静态应变 IL 的桥梁损伤定位，并显著增加了应变 IL 测量点的数量。此外，还提出了一种基于准静态应变 IL 的独立于损伤前后加载条件差异的损伤定位指数，用于定位梁桥的上部结构的损伤。最后，通过数值分析和对模型桥的准静态测试的实测数据验证了所提出方法的有效性。
