Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Experimental Study on Behaviors of Prestressed Concrete Beam Reinforced by Prestressed External Tendon

단면 보강용 외부 긴장 강선을 사용한 프리스트레스트 콘크리트 보의 거동에 관한 실험적 연구

  • Received : 2022.11.11
  • Accepted : 2022.11.24
  • Published : 2022.12.31
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Abstract

The extensive use of external prestressing system with PSC-I beam to strengthen reinforced and prestressed concrete members requires the full understanding of the behavior of the strengthened members. The main approach of this research was to experimentally investigate the flexural performance of the PSC-I beam considering external tendon and an equation was developed which indicated the produced incremental stress in the tendon due to applied load. Further, this equation was verified through performing static loading tests on two experimental specimens considering the presence or absence of external tendon. The test results revealed that, the flexural performance enhanced due to the use of external tendon. Moreover, the magnitude of the estimated flexural strength using proposed stress increasing equation almost coincides with the experimental test results. However, it was the evident of the improvement of the flexural performance of the system by reinforcing with the external tendon and also proved that the proposed equation was valid and effective.

외부 긴장재를 사용하는 PSC I 보는 외부긴장재의 복합 거동으로 해석적인 예측이 어렵다. 이러한 점을 고려하여 단면 보강용 외부 긴장강선의 사용으로 인한 휨 성능을 검증하고, 하중으로 인한 외부 강선의 응력증가량 식을 제안하여 식의 검토를 위하여 실험적 연구를 수행하였다. 검증을 위해 외부 강선의 유·무에 따른 두 개의 실험체를 제작하여 정적 하중 재하실험을 실시하였다. 실험의 연구 데이터를 비교 분석한 결과, 단면 보강용 외부 긴장강선의 사용으로 인하여 휨 성능이 증가하였다. 또한, 제안한 외부 강선의 응력증가량식을 사용하여 휨 강도를 산정한 결과값과 실험적 데이터를 비교한 결과 두 값이 거의 일치하였다. 결과적으로 단면 보강용 외부 긴장 강선으로 보강한 PSC I 보 휨 성능의 향상을 입증하였고, 제안된 응력증가량 식이 타당하였다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 "기후변화 적응형 다목적 국토확장 기술 개발(과제번호: 21CTAPC164018-01)의 연구비 지원에 의해 수행되었으며, 이에 감사드립니다.

References

  1. Min, C. S.(2015), Prestressed Concrete Structures, Goomibook, p. 310-369.
  2. Back, S. C., Song, J. H., Kim, H. B., and Kim, S. S. (2016), Reinforcement Effects using V Type External Strands on PSC I Girder Bridges, Journal of the Korea Institute for Structural Maintenance and Inspection, 20(3), 49-57. https://doi.org/10.11112/JKSMI.2016.20.3.049
  3. Choi, Y. G. (2021), Characteristics of Strength Limit State of Members with a Web-Free Section(WFS), Thesis of doctor of engineering in Kongju National University, 2021, 8, 21-24,
  4. Chin, W. J., Kim, Y. J., Kim, S. T., Park, Y. H., and Jeong, H. W. (2018), Measurement of Tension Force of External Tendon in PSC Box Girder Bridge using Smart Strand, Proceedings of the Korea Concrete Institute, 30(2), 163-164.
  5. Kim, K. D., Ahn, H. I., Han, K. J., and Kim, D. S. (2021), Design of Prestressed W-Shape Beams with a separated Prestressing Cover Plate, International Journal of Steel Structures(2021), 21(2), 4, 488, 492, 502
  6. Kim, S. H., Jung, W. T., Kang, J. Y., Park, H. B., and Park, J. Y. (2021). Experimental Study on the Strengthening Effect of External Prestressing Method Considering Deterioration. Journal of The Korea Institute for Structural Maintenance and Inspection (J. Korea Inst. Struct. Mai, 25(1), 1-6. https://doi.org/10.11112/JKSMI.2021.25.1.1
  7. KS F2408. (2016), Standard test method for flexural strength of concrete, Korean Industrial Standards, p.1-3.
  8. KDS 14 20 60. (2022), Prestressed concrete structures design criteria, Ministry of Land, Infrastructure and Transport, p.5-7.
  9. Mohamed, G. A., Eisa, A. S., Purcz, P., Rucinsky, R., and El-Feky, M. H. (2022), Effect of External Tendon Profile on Improving Structural Performance of RC Beams, Buildings, 2022, 12(6), 789, 1-4, 14-15 https://doi.org/10.3390/buildings12060789
  10. PCI (Precast/Prestressed Concrete Institute). (2014), PCI bridge design manual, Chicago, IL, 2014, Appendix B 3-18
  11. Park, C. S., Kong, B. J., and Kim, D. K. (2022). Analyzes the Design and Behavior of RC-PCP(Reinforced Concrete with Pre-Stressed Cover Plate) Girder, Proceedings of the Korea Concrete Institute, 34(1), 281-282.
  12. Ribeiro P de O, Gidrao G de MS, Vareda LV, Carrazedo R, and Malite M. (2020), Numerical and experimental study of concrete I-beam subjected to bending test with cyclic load, Latin American Journal of Solids and Structures, (2020) 17(3), 5-6.
  13. SPS-F KOCED 0011-xxxx. (2020), Standard test method for flexural performance of beam or girder member, Korea Construction Engineering Development, p.1-4
  14. S. Serega., and D. H. Faustmann. (2022). Flexural strengthen ing of reinforced concrete beams using external tendons, Engineering Structures, 252, 1-3, 16.