An Indirect Method for Monitoring Dynamic Deflection of Beam-Like Structures Based on Strain Responses
Source abstract
Abstract
An indirect method for monitoring dynamic deflection of beam-like structures using strain responses measured by long-gauge fiber Bragg grating (FBG) sensors is proposed in this paper. Firstly, a theoretical derivation shows that structural deflection is in direct and linear relationship to long-gauge strain. Meanwhile, the method is suitable for structures with different boundary conditions and irrelevant to external loads. Secondly, the influence of boundary conditions, load type and sensor gauge length on the method is investigated by numerical simulation. Finally, an experiment of a simply supported beam subjected to dynamic loads was designed to verify the method. Experimental results show that both deflection time-history of arbitrary points of structures and deflection distribution along structures at a certain time can be obtained with high-precision. Therefore, the method presented can be a new alternative for the deflection evaluation and maintenance of engineering structures.
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Research context
OpenAlex topics: Structural Health Monitoring Techniques · Advanced Fiber Optic Sensors · Structural Engineering and Vibration Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
Nanjing Gongda Construction Technology Co., Ltd., Nanjing 211899, China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province · University Science Research Project of Jiangsu Province
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