Structural Monitoring and Maintenance

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Prestress evaluation in continuous PSC bridges by dynamic identification

  • Breccolotti, Marco (Department of Civil and Environmental Engineering, University of Perugia) ;
  • Pozzaa, Francesco (Department of Civil and Environmental Engineering, University of Perugia)
  • Received : 2018.10.10
  • Accepted : 2018.12.05
  • Published : 2018.12.25
⟨ Previous Next ⟩

Abstract

In the last decades, research efforts have been spent to investigate the effect of prestressing on the dynamic behaviour of prestressed concrete (PSC) beams. Whereas no agreement has been reached among the achievements obtained by different Researchers and among the theoretical and the experimental results for simply supported beams, very few researches have addressed this problem in continuous PSC beams. This topic is, indeed, worthy of consideration bearing in mind that many relevant bridges and viaducts in the road and railway networks have been designed and constructed with this structural scheme. In this paper the attention is, thus, focused on the dynamic features of continuous PSC bridges taking into account the effect of prestressing. This latter, in fact, contributes to the modification of the distribution of the bending stress along the beam, also by means of the secondary moments, and influences the flexural stiffness of the beam itself. The dynamic properties of a continuous, two spans bridge connected by a nonlinear spring have been extracted by solving an eigenvalue problem in different linearized configurations corresponding to different values of the prestress force. The stiffness of the nonlinear spring has been calculated considering the mechanical behaviour of the PSC beam in the uncracked and in the cracked stage. The application of the proposed methodology to several case studies indicates that the shift from the uncracked to the cracked stage due to an excessive prestress loss is clearly detectable looking at the variation of the dynamic properties of the beam. In service conditions, this shift happens for low values of the prestress losses (up to 20%) for structure with a high value of the ratio between the permanent load and the total load, as happens for instance in long span, continuous box bridges. In such conditions, the detection of the dynamic properties can provide meaningful information regarding the structural state of the PSC beam.

Keywords

References

  1. Breccolotti, M. (2018), "On the evaluation of prestress loss in PRC beams by means of dynamic techniques", Int. J. Concrete Struct. Mater., 12(1).
  2. Breccolotti, M. and Materazzi, A. (2008), "Identification of a non-linear spring through the Fokker-Planck equation", Probablist. Eng. Mech., 23, 146-153. https://doi.org/10.1016/j.probengmech.2007.12.018
  3. Breccolotti, M., Materazzi, A. and Venanzi, I. (2008), "Identification of the nonlinear behaviour of a cracked RC beam through the statistical analysis of the dynamic response", Struct. Control Health Monit., 15, 416-435. https://doi.org/10.1002/stc.245
  4. CEN (2004), Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings, European Committee for Standardization, Brussels.
  5. Fang, D.P. (2014), "Second order effects of external prestress on frequencies of simply supported beam by energy method", Struct.Eng. Mech., 52(4), 687-699. https://doi.org/10.12989/sem.2014.52.4.687
  6. Farrar, C.R. and Jauregui, D.A. (1998), "Comparative study of damage identification algorithms applied to a bridge: I. Experiment", Smart Mater. Struct., 7(5), 704-719. https://doi.org/10.1088/0964-1726/7/5/013
  7. Ghosh, S. and Khuntia, M. (2004), "Flexural stiffness of reinforced concrete columns and beams: Analytical approach", ACI Struct. J., 101(3), 351-363.
  8. Ghosh, S. and Khuntia, M. (2004), "Flexural stiffness of reinforced concrete columns and beams: Experimental verification", ACI Struct. J., 101(3), 364-374.
  9. Hamed, E. and Frostig, Y. (2004), "Free vibrations of cracked prestressed concrete beams", Eng. Struct., 26, 1611-1621. https://doi.org/10.1016/j.engstruct.2004.06.004
  10. Hamed, E. and Frostig, Y. (2006), "Natural frequencies of bonded and unbonded prestressed beams- prestress force effects", J. Sound Vib., 295, 28-39. https://doi.org/10.1016/j.jsv.2005.11.032
  11. Huang, C. and Nagarajaiah, S. (2014), "Experimental study on bridge structural health monitoring using blind source separation method: Arch bridge", Struct. Monit. Maint., 1(1), 69-87. https://doi.org/10.12989/smm.2014.1.1.069
  12. Huang, M., Liu, J., Law, S. and Lu, Z. (2011), "Vibration analysis of prestressed concrete bridge subjected to moving vehicles", Interact. Multiscale Mech., 4(4), 273-289. https://doi.org/10.12989/imm.2011.4.4.273
  13. Kim, B., Jang, J., Lee, H. and Lee, D. (2010), "Effect of prestress force on longitudinal vibration of bonded tendons embedded in a nuclear containment", Nuclear Eng. Des., 240, 1281-1289. https://doi.org/10.1016/j.nucengdes.2010.02.017
  14. Li, H., Lv, Z. and Liu, J. (2013), "Assessment of Prestress Force in Bridges Using Structural Dynamic Responses under Moving Vehicles", Math. Probl. Eng., 2013.
  15. Li, H.N., Yi, T.H., Ren, L., Li, D.S. and Huo, L.S. (2014), "Reviews on innovations and applications in structural health monitoring for infrastructures", Struct. Monit. Maint., 1(1), 1-45. https://doi.org/10.12989/SMM.2014.1.1.001
  16. Limongelli, M., Siegert, D., Merliot, E., Waeytens, J., Bourquin, F., Vidal, R., Le Corvec, V., Gueguen, I. and Cottineau, L.M. (2016), "Damage detection in a post tensioned concrete beam - Experimental investigation", Eng. Struct., 128, 15-25. https://doi.org/10.1016/j.engstruct.2016.09.017
  17. Lundqvist, P. and Ryden, N. (2012), "Acoustoelastic effects on the resonance frequencies of prestressed concrete beams - Short-term measurements", NDT&E Int., 50, 36-41. https://doi.org/10.1016/j.ndteint.2012.04.010
  18. Magnel, G. (1951), "Continuity in prestressed concrete", in Prestressed Concrete Statically Indeterminate Structures, (p. 77-86). (Eds., R. P. Andrew and P. Witt), Cement and Concrete Association.
  19. Naaman, A.E. (2004), Prestressed Concrete Analysis and Design - Fundamentals, (Second Ed.), Techno Press 3000, Ann Arbor (USA).
  20. Noble, D., Nogal, M., O'Connor, A. and Pakrashi, V. (2016), "The effect of prestress force magnitude and eccentricity on the natural bending frequencies of uncracked prestressed concrete beams", J. Sound Vib., 365, 22-44. https://doi.org/10.1016/j.jsv.2015.11.047
  21. Park, R. and Paulay, T. (1975), Reinforced Concrete Structures, Wiley, New York.
  22. Remennikov, A.M. and Kaewunruen, S. (2015), "Determination of prestressing force in railway concrete sleepers using dynamic relaxation technique", J. Perform. Constr. Fac., 29(5).
  23. Smail, M., Waeytens, J. and Bourquin, F. (2014), "The health monitoring of a prestressed concrete beam using inverse modeling technique and measured dynamic response", Proceedings of the 7th European Workshop on Structural Health Monitoring, EWSHM 2014. Nantes (F).
  24. Xiang, Z., Chan, T.H., Thambiratnam, D.P. and Nguyen, T. (2016), "Synergic identification of prestress force and moving load on prestressed concrete beam based on virtual distortion method", Smart Struct. Syst., 17(6), 917-933. https://doi.org/10.12989/SSS.2016.17.6.917
  25. Xuan, F.Z., Tang, H. and Tu, S.T. (2009), "In situ monitoring on prestress losses in the reinforced structure with fiber-optic sensors", Measurement, 42, 107-111. https://doi.org/10.1016/j.measurement.2008.04.011
  26. Zhong, H., Yang, M. and Gao, Z. (2015), "Dynamic responses of prestressed bridge and vehicle through bridge-vehicle interaction analysis", Eng. Struct., 87, 116-125. https://doi.org/10.1016/j.engstruct.2015.01.019

Cited by

  1. On the Effectiveness of Vibration-Based Monitoring for Integrity Management of Prestressed Structures vol.6, pp.12, 2021, https://doi.org/10.3390/infrastructures6120171