Performance Monitoring
Design and installation of sensors to monitor long term behavior of bridge
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The Challenge
- Fabrication and installation of loads cells
- Deck strain
- Needed a data collection method to measure long term post-tensioning forces
The M-50 Bridge Project in Jackson, MI involved fabrication and installation of 20 load cells for monitoring transverse Carbon Fiber Reinforced Polymer (CFRP) tendons and a data collection method to measure long term post-tensioning forces.
The Pembroke Ave over M-39 Bridge in Southfield, MI involved monitoring deck strains in the NEFMAC deck grid reinforcement, CFCC transverse post-tensioning forces and midspan deflections at selected locations. It also required collection of data and posting to a password protected website for near real-time data review.
The Solution
Geocomp designed and fabricated 20 custom built 300-kip electrical resistance load cells, and calibrated and installed the load cells on the 40-mm diameter transverse Carbon Fiber Composite Cable (CFCC) with a switch panel for collection of manual load cell readings by MIDOT personnel.
For the M-39 Bridge, Geocomp designed and installed sensors, a data logger, and data management system inside an environmentally controlled enclosure to collect long-term real-time data posted to Geocomp’s iSiteCentral® data management system for review and reporting.
The bridge deck contains 40 vibrating wire strain gages, 12 transversely mounted post-tensioning load cells and 12 distance laser units underneath the roadway to measure midspan deflections
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