Journal
APPLIED SCIENCES-BASEL
Volume 7, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/app7040384
Keywords
Fiber Bragg grating (FBG); vibration sensor; theory of string vibration; cable force monitoring; structural health monitoring
Categories
Funding
- Natural Science Foundation of China [51605348, 51174153, 51374164]
- Natural Science Foundation of Hubei province [2016CFB116]
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A normal cable force state of a suspension bridge is extremely vital to bridge safety. For cable force monitoring of already completed suspension bridges, it is not suitable to conduct direct parameter measurements by modifying the anchor cable structure of the bridge. Instead, using an indirect measurement would not destroy the bridge's original structure and also meet engineering requirements. In this paper, a fiber Bragg grating (FBG) vibration sensor was developed for online monitoring of the cable vibration characteristics of Tongwamen bridge. The monitored vibration frequency was converted into cable force according to the theory of string vibration, so as to achieve an indirect measurement of bridge cable force. On both north and south sides of the bridge, FBG vibration sensors were mounted symmetrically on 8 of 19 cables for distributed measurement. The forces of two cables were found to be abnormal, which was considered worthy of attention and close inspection. This result is of great significance for the structural monitoring and safe operation of Tongwamen bridge.
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