Pre-Stress Losses in Decked Bulb-Tee Girders (Phase 1-A: Sensor Study for Pre-Stress Loss Monitoring System)

Details

• Creators:
  Ahn, Il-Sang
• Corporate Creators:
  University of Alaska Fairbanks. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Alaska. Department of Transportation and Public Facilities. Research and Technology Transfer
• Subject/TRT Terms:
  • Creep
  • Frigid regions
  • Girder bridges
  • Low temperature
  • Prestressed concrete bridges
  • Shrinkage
  • Strain (Mechanics)
  • Strain gages
  • Structural health monitoring
  • Concrete
  More +
• Publication/ Report Number:
  FHWA-AK-RD-4000(178), FHWA-AK-RD-4000-178
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Alaska. Department of Transportation and Public Facilities. Research and Technology Transfer
• Description:
  The research tested the performance of concrete-embedded strain sensors. The strain sensors are to use in a long-term pre-stress loss monitoring system of decked bulb-tee girders. Based on the measured total strain for 120 days, it was evaluated that the total strain can reach 3,000με over 5 years. Three types of vibrating wire strain gauges (VWSGs) and one type of fiber optic strain gauge (FOSG) were tested, and the measurement range of the VWSG-R sensor (5,000με) is wide enough for the expected strain change. Both VWSG-B and VWSG-R were responsive through a wide range of temperatures. After applying five thermal cycles (-40°F ~73°F), VWSG-B and VWSG-R accurately measured the strain without any apparent deterioration from cold temperatures. Since each sensor was factory-calibrated, temperature correction can be performed more precisely with the VWSG-R sensor. The overall performance of the VWSG-R sensor is better than other tested sensors considering the significant temperature change that sensors will experience. The research concluded that the VWSG-R sensor is appropriate for use in long-term pre-stress loss monitoring.
• Format:
  PDF
• Funding:
  Federal # 4000178 IRIS# HFHWY00081
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/58004/dot_58004_DS1.pdf
• File Type:
  [PDF - 6.62 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1f095d13d11e5bae33007c64abf0bbd391d46b7a5f4dc9d22318a1ba8b35e276