期刊
SENSORS
卷 18, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/s18124117
关键词
bridge; structural health monitoring; statistical pattern recognition; temperature effect
资金
- National Natural Science Foundation of China [51878226]
- Research Project of Knowledge Innovation Plan in Shenzhen [JCYJ20160531193340540]
- Guangdong Provincial Natural Science Foundation [2017A030313292]
- Fundamental Research Funds for the Central Universities
This work describes a vibration-based structural health monitoring of a prestressed-concrete box girder bridge on the A100 Highway in Berlin by applying statistical pattern recognition technique to a huge amount of data continuously collected by an integrated monitoring system during the period from 2000 to 2013. Firstly, the general condition and potential damage of the bridge is described. Then, the dynamic properties are extracted from 20 velocity sensors. Environmental variability captured by five thermal transducers and traffic intensity approximately estimated by strain measurements are also reported. Nonlinear influences of temperature on natural frequencies are observed. Subsequently, the measurements during the first year are used to build a baseline health index. The multiple linear regression (MLR) method is used to characterize the nonlinear relationship between natural frequencies and temperatures. The Euclidean distance of the residual errors is calculated to build a statistical health index. Finally, the indices extracted from the following years gradually deviate; which may indicate structural deterioration due to loss of prestress in the prestressed tendons.
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