Bridge shape is the important indicator to estimate the safety of the bridge. A bridge shape measurement system based on fiber optic gyroscope is builded up to survey the continuous shape of bridge. This measurement system comprises angular velocity sensor, linear velocity sensor, position sensor and etc. The bridge shape survey using the leveling measurement and bridge continuous shape measurement system was carried out after the earthquake. By comparing the data before and after the earthquake, the numerical values of the two method were similar. The experimental results show that the proposed system is an effective measurement method.
The long span highway-railway cable-stayed bridge bears huge permanent load and heavy moving load. The structural
internal force is the key for bridge safety operation. This paper introduces the fiber Bragg grating (FBG) strain sensor,
FBG force-testing ring and FBG acceleration sensor to monitor the pivotal parameters of dynamic strain, cable force and
dynamic characteristics. The bridge health monitoring system based on the three FBG sensors has been applied in
Tianxingzhou bridge. The FBG sensors were monitoring during bridge construction stage, load test and normal
operation. The analysis based on engineering monitoring data indicates that the data of FBG sensors are stable and
reliable.
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