Influence of changes in the prestress force on dynamic specifications of the prestressed concrete beam

Document Type : Research

Authors

1 Assistant Professor, Department of Civil Engineering East Tehran branch, Islamic Azad University, Tehran, Iran.

2 Associate Professor, School of Engineering Science, College of Engineering, University of Tehran, Tehran, Iran.

Abstract

Pre-stress techniques tend to increase cross-sectional capacity and optimize design. Such features have made these techniques rather popular. Over time, these structures tend to fail, and the reduction of pre-stress force over the lifetime of the structure is said to be one of the most significant destructive factors in these structures. This decrease in force occurs due to various reasons. In majority of cases, a cracking of pre-stressed concrete beams appears due to the reduction of pre-stress strength. Where there is permanent monitoring by the sensors buried within pre-stressed tendons, the force of the tendons can be investigated. But given the high cost of this procedure, such monitoring cannot be implemented in many structures. Nevertheless, it is possible to determine changes in pre-stress forces through investigating the dynamic behavior of structures. This paper examines the changes in the dynamic behavior of a pre-stressed beam experiencing a variety of pre-stress force levels. The idea is to monitor force changes in the pre-stressed tendons via examining certain dynamic characteristics of the beam (namely, modal damping and resonance frequency) and carry out repair prior to fail. The results show that with increasing the prestressing force, the system frequency increased and the system damping decreased.

Keywords

References

  1.  Ney Roitman. and F. Viero. and FL. Rosa; (1992) "Identification of offshore platform structural damage using modal analysis techniques", Mechanical Systems and Signal ProcessingVolume 6, Issue 3, May, Pages 287-295 [DOI:10.1016/0888-3270(92)90031-D]
  2.  Shabbir F. and Omenzetter P., (2008), "Forced vibration testing of a thirteen store concrete building ", NZSEE Conference , Wellington, New Zealand, April
  3.  Wullff, J.Gand,Vanorden,R.C, (1979)," Evaluation Of Earthquake Stability Of Lower Springs Dam California - U.S.A " , Proceedings Of The 13th International Congress On Large Dam , New Delhi, India, October
  4.  Takewaki and Nakamura ,(2012), System Identification for Structural Health Monitoring, Published by -WIT Press- USA
  5.  H.M. Irvine, Cable Structures, The MIT Press, England, 1981.
  6.  Bui Khac DIEP, Junichiro NIWA,( 2006), " Ultimate tendon stress in beams prestressed with external tendons" Doboku Gakkai Ronbunshuu E ,Volume 62 , Issue 1 Pages 52-66 [DOI:10.2208/jsceje.62.52]
  7.  D Noble,M Nogal,A J. O'Connor,V Pakrashi, "Te effect of prestress force magnitude on thenatural bending frequencies of prestressed concretestructures" ,23rd Australasian Conference on the Mechanics of Structures and Materials, Byron Bay, Australia 9-12 December 2014 ,
  8.  Jeong-Tae Kim, Jae-Hyung Park, Dong-Soo Hong, Woo-Sun Park,(2010) " Hybrid health monitoring of prestressed concrete girder bridges by sequential vibration-impedance approaches" , Engineering Structures, Volume 32, Issue 1, January 2010, Pages 115-128 [DOI:10.1016/j.engstruct.2009.08.021]
  9.  Kim, Jeong-Tae, Yun, Chung-Bang, Ryu, Yeon-Sun and Cho, Hyun-Man. (2004) "Identification of prestress-loss in PSC beams using modal information", Structural Engineering and Mechanics, Vol. 17, No.3-4, pp. 467-482 [DOI:10.12989/sem.2004.17.3_4.467]
  10.  Marco Domaneschi, Maria Pina Limongelli and Luca Martinelli, (2013)"Vibration based damage localization using MEMS on a suspension bridge model", Smart Structures and Systems, Volume 12, Number 6, December, pages 679-694 [DOI:10.12989/sss.2013.12.6.679]
  11.  Saiidi, M., Douglas, B. and Feng, S. (1994) " Prestress Force Effect on Vibration Frequency of Concrete Bridges", Journal of Structural Engineering, Vol. 120, No. 7, pp. 2233-2241. [DOI:10.1061/(ASCE)0733-9445(1994)120:7(2233)]
  12.  Shabbir F. and Omenzetter P., (2008), "Forced vibration testing of a thirteen store concrete building ", NZSEE Conference , Wellington, New Zealand, April
  13.  Brincker,(2015), INTRODUCTION TO OPERATIONAL MODAL ANALYSIS, published John Wiley & Sons, Ltd, United Kingdom [DOI:10.1002/9781118535141]
  14.  Brinker R, Zhang L, Andersen P. Modal identification of output-only systems using frequency domain decomposition. Smart Mater Struct 2001;10:441-5. [DOI:10.1088/0964-1726/10/3/303]
  15.  Steve P. Beeby, Graham Ensel ,(2004), MEMS Mechanical Sensors , Publisher, Artech Print on Demand
  16.  Takewaki and Nakamura ,(2012), System Identification for Structural Health Monitoring, Published by -WIT Press- USA
  17.  Vetterli , Kovačević and Goyal , (2014),Foundations of Signal Processing, Published by Cambridge University, [DOI:10.1017/CBO9781139839099]
  18.  Wullff, J.Gand,Vanorden,R.C, (1979)," Evaluation Of Earthquake Stability Of Lower Springs Dam California - U.S.A " , Proceedings Of The 13th International Congress On Large Dam , New Delhi, India, October
  19. Young, and W. C., Budynas, R. G.(2002),Roark's Formulas for Stress and Strain , McGraw-Hill,
  20.  Yurish, Sergey Y., Gomes, Maria T.S.R,(2003) , Smart Sensors and MEMS , by NATO Advanced Study Institute on Smart Sensors and MEMS [DOI:10.1007/978-1-4020-2929-5]
Numerical Methods in Civil Engineering
Volume 5, Issue 1
September 2020
Pages 8-14

Files

History

  • Receive Date: 10 July 2020
  • Revise Date: 01 September 2020
  • Accept Date: 27 September 2020

Share

How to cite

Statistics