Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Analytical Method on PSC I Girder with Strengthening of External Tendon

외부강선으로 보강되는 PSC I 합성거더의 해석 기법

  • 박재근 (성균관대학교 건설 환경시스템학과) ;
  • 이병주 (한국도로공사 도로교통기술원) ;
  • 김문영 (성균관대학교 건설 환경시스템학과) ;
  • 신현목 (성균관대학교 건설 환경시스템학과)
  • Published : 2008.12.31
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Abstract

This paper presents an analytical prediction of Nonlinear characteristics of prestressed concrete bridges by strengthened of externally tendon considering construction sequence, using unbonded tendon element and beam-column element based on flexibility method. Unbonded tendon model can represent unbounded tendon behavior in concrete of PSC structures and it can deal with the prestressing transfer of posttensioned structures and calculate prestressed concrete structures more efficiently. This tendon model made up the several nodes and segment, therefore a real tendon of same geometry in the prestressed concrete structure can be simulated the one element. The beam-column element was developed with reinforced concrete material nonlinearities which are based on the smeared crack concept. The fiber hysteresis rule of beam-column element is derived from the uniaxial constitutive relations of concrete and reinforcing steel fibers. The formulation of beam-column element is based on flexibility. Beam-column element and unbonded tendon element were be involved in A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), that were used the analysis of RC and PSC structures. The proposed numerical method for prestressed concrete structures by strengthened of externally tendon is verified by comparison with reliable experimental results.

이 논문은 외부 강선으로 보강된 PSC 교량의 시공단계가 고려된 비선형거동 예측을 위한 연구이다. 해석시 비부착 텐던 요소와 유연도법에 근거한 보-기둥 요소를 사용하였다. 비부착 텐던 모델은 PSC 구조물의 콘크리트내의 텐던의 거동을 모사하며 포스트텐션 (posttensioned) 구조물의 프리스트레싱력과 전달을 효율적으로 모사할 수 있다. 이 모델은 여러 절점과 세그먼트로 구성되며 PSC 구조물내의 같은 위치의 텐던을 하나의 텐던 요소로 모사할 수 있다. 보-기둥 요소는 분산균열 개념에 기초한 철근콘크리트 비선형 재료모델을 포함하고 있다. 유연도법에 근거하여 유도된 보-기둥 요소의 각각의 파이버는 콘크리트와 철근의 일축 거동을 모사한다. 보-기둥요소와 비부착 텐던 요소는 RC 및 PSC 구조물의 상세 비선형해석을 수행할 수 있는 RCAHEST (reinforce concrete analysis in higher evaluation system technology)에 이식하였다. 외부 강선으로 보강된 PSC 구조물에 대한 수치기법은 신뢰성 있는 실험 결과와 비교하여 검증하였다.

Keywords

References

  1. Ariyawardena, N. and Ghali, A., 'Prestressing with Unbonded Internal or External Tendons: Analysis and Computer Model,' Journal of Structural Engineering, ASCE, Vol. 128, No. 12, 2002, pp. 1493-1501 https://doi.org/10.1061/(ASCE)0733-9445(2002)128:12(1493)
  2. Tan, K. H. and Tjandra, R. A., 'Strengthening of RC Continuous Beams by External Prestressing,' Journal of Structural Engineering, ASCE, Vo. 133, No. 2, 2007, pp. 195-204 https://doi.org/10.1061/(ASCE)0733-9445(2007)133:2(195)
  3. Andrea, D., Laura R., and Alessandro, Z., 'Simplified Method for Failure Analysis of Concrete Beams Presteessed with External Tendons,' Journal of Structural Engineering, ASCE, Vol. 133, No. 1, 2007, pp. 121-131 https://doi.org/10.1061/(ASCE)0733-9445(2007)133:1(121)
  4. Bilal, E. A., 'Stiffness of Reinforced Concrete Beams with External Tendons,' Engineering Structures, Vol. 26, 2004, pp. 2047-2051 https://doi.org/10.1016/j.engstruct.2004.04.009
  5. Andersion, P., Berglund, L. E., and Gustavsson, J., 'Average Force along Unbonded Tendons: a Field Study at Nuclear Reactor Containments in Sweden,' Nuclear Engineering and Design, Vol. 33, 2005, pp. 91-100
  6. Kwak, H. G. and Kim, J. H., 'Numerical Models for Prestressing Tendons in Containment Structures,' Nuclear Engineering and Design, Vol. 236, 2006, pp. 1061-1080 https://doi.org/10.1016/j.nucengdes.2005.10.010
  7. Moo, J. H. and Burns, H. H., 'Fluxural Behavior of Member with Unbonded Tendons. I : Theory,' Journal of Structural Engineering, ASCE, Vol. 123, No. 8, 1997, pp. 1087-1094
  8. Moo, J. H. and Burns, H. H., 'Fluxural Behavior of Member with Unbonded Tendons. II : Applications,' Journal of Structural Engineering, ASCE, Vol. 123, No. 8, 1997, pp. 1095-1101
  9. Wu, X. H. and Lu, X., 'Tendon Model for Nonlinear Analysis of Externally Prestressed Concrete Structures,' Journal of Structural Engineering, ASCE, Vol. 129, No. 1, 2003, pp. 96-104 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:1(96)
  10. 이병주, 박재근, 김문영, 신현목, 박창호, 'PSC I 합성거더의 휨 거동 및 외부강선 보강효과에 관한 실험연구,' 콘크리트학회논문집, 19권, 6호, 2007, pp. 755-762 https://doi.org/10.4334/JKCI.2007.19.6.755
  11. Kim, T.-H., Lee, K,-M., Yoon, C.-Y., and Shin, H. M., 'Inelastic Behavior and Ductility Capacity of Reinforced Concrete Bridge Piers under Earthquake. I: Theory and Formulation,' Journal of Structural Engineering, ASCE, 2003, Vol. 129, No. 9, pp. 1199-1207 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:9(1199)

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