DOI QR코드

DOI QR Code

Experimental Evaluation of Prestress Force in Tendons for Prestressed Concrete Girders using Sensors

계측 센서를 활용한 PSC 거더 텐던의 긴장력 측정 실험

  • Received : 2015.10.26
  • Accepted : 2015.11.30
  • Published : 2015.12.29

Abstract

The prestressing force has not been managed after construction nevertheless it is one of the importrant factors that maintain the structural safety of PSC girder bridges. The prestressing force is just measured during construction using jacking device and after that, it can not be managed practically. For this reason, this study investigated the measurements of prestress using embedded sensors that can be available now with an ultimate goal to propose smart prestressed girders that can measure the prestress from the birth to the end of service life. 4 types of sensors were installed on the small prestressed girders, and the applicability and the accuracy of those sensors were tested while the prestress was applied to the girders. The results show that a center-hole type loadcell has a tendency to measure a prestressing force higher than a reference value, especially when it is loaded with an eccentricity. a EM sensor shows several advantages that has a good practical accuracy, that can be installed anyplace along the tendons.

Keywords

PSC girder;prestress evaluation;loadcell;EM sensor

References

  1. Baudendistel, T.A,, Tunner, M.L. (2007) A Novel Inverse-Magnetostrictive Force Sensor, IEEE Sensor J., 7(2), pp.245-250. https://doi.org/10.1109/JSEN.2006.886876
  2. Burn, N.H., Helwig, T., Tsujimoto, T. (1991) Effective Prestress Force in Continuous Post-Tensioned Beams with Unbonded Tendons, ACI Struct. J., 88(1), pp.84-90.
  3. Chaki, S., Bourse, G. (2009) Stress Level Measurement in Prestressed Steel Strands using Acoustoelastic Effect, Exp. Mech., 49, pp.673-681. https://doi.org/10.1007/s11340-008-9174-9
  4. Chen, H.L., Wissawapaisal, K. (2001) Measurement of Tensile Forces in a Seven-Wire Prestressing Strands using Stress Waves, ASCE J. Eng. Mech., 127(6), pp.599-606. https://doi.org/10.1061/(ASCE)0733-9399(2001)127:6(599)
  5. Civjan, S.A., Jirsa, J.O., Carrasquillo, R.L., Fowler, D.W. (1995) Method to Evaluate Remaining Prestress in Damaged Prestressed Bridge Girders, Research Report No.1370-2, Center for Transportation Research, Bureau of Engineering Research, The University of Texas, Austin.
  6. Kim, B.H., Joh, C.B., Lee, D.H. (2013) The Using Permeability of Magnetic Flux using Measured Elastic Wave Velocity. J. Earthq. Eng.. 17(5A), pp.219-225.
  7. Kim, B.H., Jang, J.B., Lee, H.P., Lee, I.K. (2012) Estimation of Prestressed Tension on Grouted PSC Tendon using Measured Elastic Wave Velocity, J. Korean Soc. Civil Eng., 32(5A), pp.289-297. https://doi.org/10.12652/Ksce.2012.32.5A.289
  8. Kim, J.K., Park, J.Y., Zhang, A., Lee, H.W., Park, S.H. (2015) Tensile Force Monitoring for Pre-Stress Tendon of PSC Girder by Incorporating FBG and EM Sensor, Nondestructive Characterization of Materials, NDCM 2015, USA.
  9. Kim, J.T., Hong, D.S., Park, J.H., Cho, H.M. (2008) Vibration-Based Monitoring of Prestress-Loss in PSC Girder Bridges, J. Comput. Struct. Eng. Inst. Korea, 21(1), pp.83-90.
  10. Lin, T.Y. (1963) Design of Prestressed Concrete Structures, John Wiley & Sons, USA.
  11. Miyamoto, A., Tei, K., Nakamura, H., Bull, J.W. (2000) Behavior of Prestressed Beam Strengthed with External Tendons, J. Struct. Eng., ASCE, 126(9), pp.1033-1044 https://doi.org/10.1061/(ASCE)0733-9445(2000)126:9(1033)
  12. Nabil, F.G., Brian, R. (1996) Dynamic Characteristics of Post-Tensioned Girders with Web Openings, J. Struct. Eng., 122, pp.643-650. https://doi.org/10.1061/(ASCE)0733-9445(1996)122:6(643)
  13. Pessiki, S., Kaczinski, M., Wescott, H.H. (1996) Evaluation of Effective Prestress Force in 28-Year-Old Prestressed Concrete Bridge Beams, PCI J., 41(6), pp.78-89 https://doi.org/10.15554/pcij.11011996.78.89
  14. Saiidi, M., Douglas, B., Feng, S. (1994) Prestress Force Effect on Vibration Frequency of Concrete Bridges, J. Struct. Eng., ASCE, 120(7), pp.2233-2241. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:7(2233)
  15. Saiidi, M., Douglas, B., Feng, S. (1994) Prestress Force Effect on Vibration Frequency of Concrete Bridges, J. Struct. Eng., ASCE, 120(7), pp.2233-2241. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:7(2233)
  16. Sharif, A., Taher, S.E.F., Basu, P.K. (1993) Time-dependent Losses in Prestressed Continuous Composite Beams, J. Struct. Eng., ASCE, 119(11), pp.3151-3168 https://doi.org/10.1061/(ASCE)0733-9445(1993)119:11(3151)
  17. Wang, M.L., Chen, Z. (2000) Magneto-Elastic Permeability Measurement for stress monitoring in steel tendons and cables, Proc. of the SPIE 7th Annual Symposium on Smart Structures and Materials, Health Monitoring of the Highway Transportation Infrastructure, 3995, pp.492-500.

Cited by

  1. Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors vol.17, pp.8, 2017, https://doi.org/10.3390/s17081843
  2. Damage Detection with FBG Sensors for Pre-Stress Concrete Girders vol.737, pp.1662-9795, 2017, https://doi.org/10.4028/www.scientific.net/KEM.737.454
  3. Magnetic Hysteresis Monitoring according to the Change of Tensile Force and Steel Class of PS Tendons vol.31, pp.2, 2018, https://doi.org/10.7734/COSEIK.2018.31.2.115

Acknowledgement

Supported by : 국토교통부