A total of 72 long-gage (2m long) optical fiber deformation sensors, along with 36 thermocouples were installed into one
span of the five span high performance prestressed concrete I-10 Bridge over University in Las Cruces, NM. The sensors
were installed along the bottom and top flanges, at mid-span and quarter spans. Pairs of crossed sensors in a rosette
configuration were embedded in the webs at the supports. The embedded sensors measured temperature and
deformations at the supports, quarter spans, and mid-span. Data was collected from beam fabrication, thru bridge
construction and service. Collected data was analyzed to evaluate in-situ material properties, prestress losses and
cambers in the girders. Actual losses and camber were compared to the losses and camber predicted using available code
methods. The project was funded by the New Mexico DOT and the FHWA under the Innovative Bridge Research and
Construction Program.
We describe the monitoring of the dynamic strain response of an in-service I-10 interstate bridge due to traffic loading. FBG sensors were attached to the center support girder of one span of the structure. Using a fiber Bragg grating interrogation system based on a wavelength division multiplexer, the sensors were monitored for various vehicle loading conditions.
We describe a fiber optic Bragg grating distributed strain sensor system for large scale structural monitoring applications, such as bridge monitoring. The system is capable of assessing both long term static structural loading changes and dynamic/modal behavior of the structure using two different optical interrogation schemes to address the same sensor array. The system has been used to monitor over 45 sensors attached to or embedded in a single-lane bridge span, for damage assessment.
We describe an instrumentation system which provides the capability to monitor a large number of Bragg gratings using a common source and a scanning narrowband filter. The system described has the capability to monitor 12 FBG sensors along each of 5 fibers for a total of 60 sensor elements. We demonstrate the use of this system to address multiple sensors embedded in and attached to a quarter scale bridge span.
A network of distributed optical Bragg grating sensors is used for monitoring of a full scale laboratory bridge in its pristine and damaged state. Damages consist of a series of cuts that are introduced in an external girder to simulate fracture or fatigue crack of a main load carrying bridge component. The after fracture behavior is described in terms of load path redistribution and strain level changes in the structure.
An integrated optical fiber sensor system is being developed for highway bridge monitoring. Laboratory small and large scale testing were performed to explore the feasibility of the system. Large scale reinforced concrete beams were fabricated in the laboratory, and artificial flaws in terms of delaminations were simulated in the beams during construction. The sensing system was used to evaluate the effect of these damages on the behavior of the beams.
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