Experimental study on natural frequency measurement of underwater structure with fiber optic sensor
An equivalent single pier model of a typical deep water bridge was investigated in this study. A rod made of aluminum was used to simulate a bridge pier and a mass was attached to the top of the rod to simulate the superstructure of the bridge.An initial displacement of 5cm was applied to the top of the rod and then released to produce free vibration.Fiber Bragg grating(FBG)sensor was used to measure the dynamic strain of the rod under different water depth conditions.The feasibility of fiber optic sensor applied in underwater structures monitoring is discussed.The natural frequency of the underwater structure can be obtained by Fourier transformation of the dynamic strain.The experimental results show that the FBG sensor can realize the measurement of dynamic strain and natural frequencies of underwater structures under different water depths.
Jingnan Yang Xiongjun He Jingjing Xu
School of Transportation,Wuhan University of Technology,Wuhan,China;Department of Civil and Material School of Transportation,Wuhan University of Technology,Wuhan,China
国际会议
上海
英文
1-6
2018-12-17（万方平台首次上网日期，不代表论文的发表时间）