Define the engineering quantity
Separate direct local strain measurement from inferred cable force, modal frequency, anchorage response and fatigue indicators.
Case Overview
UW-FBG strain sensing can capture the spatial and time-varying response of monitored stay-cable components under traffic, wind and temperature. The optical measurements provide evidence for cable-force assessment, but the final engineering quantity depends on sensor location, strain transfer, temperature compensation and a calibrated mechanical model.
Application Value
Continuous cable-response evidence for force assessment, anomaly detection and condition-based bridge maintenance.
From optical strain to defensible cable-force assessment
A reliable system is defined by the structural question first. The sensing layout, compensation method and force model must be designed together rather than treating the interrogator output as cable tension by itself.
Choose the sensing location
Locate sensors on the cable, anchorage or associated load path according to access, strain transfer and the structural model used for interpretation.
Compensate temperature and installation effects
Use temperature references and installation baselines so thermal response, bonding behavior and prestress are not mistaken for force change.
Calibrate and validate the model
Relate optical response to an accepted force-estimation method, then verify the result against commissioning loads or an independent reference.
FBG or UW-FBG? Conventional FBG is appropriate for a limited number of known critical points. UW-FBG is valuable when the design requires denser spatial evidence, longer coverage or multiple measurement locations along the same optical line.
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Laboratory verification of a cable-component sensing arrangement before field installation. The setup is used to establish transfer behavior and a repeatable measurement baseline.
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