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Pre-Stress Losses in Decked Bulb-Tee Girders (Phase 1-A: Sensor Study for Pre-Stress Loss Monitoring System)
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2020-08-31
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By Ahn, Il-Sang
[PDF-6.62 MB]
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Abstract: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.
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