A novel bridge curve mode measurement technique based on fog

In order to achieve the rapid measurement of bridge structure curve mode and locate accurately the maximum deflection, a continuous curve mode measurement method based on fiber optic gyro (FOG) sensing technology is studied. According to the characteristics when FOG-based continuous curve mode measurement used for the bridge, the measurement method premises are analyzed, the trajectory calculating formula of continuous curve mode is derived. In addition, some revising and calibration methods for the testing results and integration way for the measurement device are put forward. The application in a scale model bridge and an actual bridge showed that the testing results of FOG-based continuous curve mode were close to the traditional way by dial indicator and total station, had the same change trend and can be used for correctly locating the bridge maximum deflection position.