Connecticut permanent long-term bridge monitoring network, volume 5 : wireless monitoring of the hung span in a large truss bridge - I-95 NB over the Thames River in New London (bridge #3819).
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2014-08-01
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Abstract:This report describes the instrumentation and data acquisition for the center hung segment in the largest
truss bridge in Connecticut, located on the interstate system. The monitoring system was developed as a
joint effort between researchers at the University of Connecticut and a company manufacturing wireless
sensor technology, and it is the first of its kind. The great lengths between sensors, along with the difficulty
of running wires over the trusses, led to the decision to use wireless sensors. Access to the underside of the
bridge is severely limited, requiring closing of a lane whenever researchers are on the bridge. Since wireless
sensors require batteries for power, necessitating replacement of batteries on a regular basis, researchers
proposed use of solar panels along with rechargeable batteries for use with the sensors. The initial system
was developed and placed on the bridge and used to collect strains and accelerations. Using what was
learned from the initial system, changes and upgrades were made to the equipment. This included sensor
modifications, replacement of some of the solar panels and revisions to the monitoring techniques. This
report shows what was learned from the initial phases for this first-of-its kind monitoring system.
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