A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Application of Distributed Optical Fiber Sensors for Monitoring Pavement Settlement
Abstract This paper presents a novel beam (namely large-settlement beam) applied for monitoring large settlement underground based on fiber Bragg grating (FBG) and Brillouin optical time domain analysis (BOTDA), which were primarily mounted on the beam surface for strain measurement. Calibration test was performed to validate the performance of the beam for monitoring large deflection (settlement) under a load/unload cycle. Strain data collected from FBG and BOTDA sensors agree fairly well under this load/unload cycle and the corresponding deflection calculated using finite difference method are in good agreement with measured data from Linear Variable Differential Transformers (LVDTs). The relative errors occurred during loading and unloading processes were also found to be maintained within a limited range. The errors occurred during unload process were slightly higher than that in loading process, this phenomenon is possibly attributed to the unrecoverable plastic deformation when large deflection occurs. The maximum deflection achieved in present test was around 110 mm so that the large-settlement is expect to be embedded as a settlement sensor under pavements, foundations, and dams for monitoring possible excessive settlement.
Application of Distributed Optical Fiber Sensors for Monitoring Pavement Settlement
Abstract This paper presents a novel beam (namely large-settlement beam) applied for monitoring large settlement underground based on fiber Bragg grating (FBG) and Brillouin optical time domain analysis (BOTDA), which were primarily mounted on the beam surface for strain measurement. Calibration test was performed to validate the performance of the beam for monitoring large deflection (settlement) under a load/unload cycle. Strain data collected from FBG and BOTDA sensors agree fairly well under this load/unload cycle and the corresponding deflection calculated using finite difference method are in good agreement with measured data from Linear Variable Differential Transformers (LVDTs). The relative errors occurred during loading and unloading processes were also found to be maintained within a limited range. The errors occurred during unload process were slightly higher than that in loading process, this phenomenon is possibly attributed to the unrecoverable plastic deformation when large deflection occurs. The maximum deflection achieved in present test was around 110 mm so that the large-settlement is expect to be embedded as a settlement sensor under pavements, foundations, and dams for monitoring possible excessive settlement.
Application of Distributed Optical Fiber Sensors for Monitoring Pavement Settlement
Zhang, Yifan (author) / Hong, Chengyu (author) / Zhang, Yawen (author) / Ahmed, Rafique (author)
2017-06-28
11 pages
Article/Chapter (Book)
Electronic Resource
English
Large-settlement beam , Fiber bragg grating , Brillouin optical time domain analysis , Finite difference method Engineering , Geoengineering, Foundations, Hydraulics , Geotechnical Engineering & Applied Earth Sciences , Vibration, Dynamical Systems, Control , Monitoring/Environmental Analysis , Building Repair and Maintenance , Transportation Technology and Traffic Engineering
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