Abstract
Structural health monitoring of highway bridges is a vital but currently challenging aspect of infrastructure engineering due to the number of sensors required, power requirements, and harsh environmental conditions. The purpose of this study is to develop a structural health monitoring system using fiber optic sensors based on fiber Bragg gratings that addresses these issues and is field deployable. Prototype systems were installed on two steel girder bridges. The first bridge used sensors adhered to the web and flange. The second bridge used a flange-only array of mechanically mounted sensors. The results demonstrated the accuracy of the fiber Bragg grating sensors and indicated that fewer multiplexed fiber optic cables and loosely routed cables were needed to maintain signal integrity. Adhered sensors were prone to lose their bond due to the curing conditions in the field. The findings suggest that the proposed system may be best used in a hybrid deployment, where a diagnostic field test with conventional sensors is used to determine the baseline bridge response and fiber optic sensors are periodically installed for short-term monitoring.
Highlights
The condition of highway bridges is one of the most well-known indicators of the overall health of civil infrastructure [1]
A field test was conducted in accordance with the AASHTO Manual of Bridge Evaluation [36]
The results demonstrated that the strains captured by the fiber optic system and the was equal to the HS20 vehicle load, because the Load Factor Design (LFD) method [41] was conventional system agreed relatively well
Summary
The condition of highway bridges is one of the most well-known indicators of the overall health of civil infrastructure [1]. The risk of deterioration from natural hazards is a function of both the bridge’s vulnerability and the time that the bridge is exposed to the hazards It follows that the structural condition of existing older bridges is important. Overweight vehicles are important in regions where heavy machinery and equipment (e.g., equipment for the energy sector or military needs) are routinely transported over surface roads. In these cases, the bridges are potentially subjected to vehicular loads that are well above the safe load carrying capacity of the structure.
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