KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

Earthquake Response Analysis of a RC Bridge Including the Effect of Repair/retrofitting

보수/보강 효과를 고려한 철근콘크리트교량의 내진응답해석

  • 이도형 (배재대학교 공과대학 건설환경철도공학과) ;
  • 조규상 (배재대학교 대학원 토목환경공학과) ;
  • 전정문 (배재대학교 대학원 토목환경공학과)
  • Received : 2008.05.21
  • Accepted : 2008.06.20
  • Published : 2008.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

Nonlinear analyses have been carried out for both bridge piers and a bridge structure being repaired using a repair element in order to assess the post-repair seismic response of such structures. For this purpose, a simplified CFRP stress-strain model has been proposed. The analytical predictions incorporating the current developments correlate reasonably well with experimental results in terms of strength and stiffness. In addition, nonlinear dynamaic analyses have also been conducted for a bridge structure in terms of the created multiple earthquake sets to evaluate the effect of pier repair on the response of a whole bridge structure. In these analyses, potential plastic hinge zones of piers are virtually repaired by CFRP and steel jacketing. Comparative results prove the virtual necessity of performing nonlinear post-repair analyses under multiple earthquakes, particularly when the post-repair response features are required. In all, the present approaches are expected to provide salient information regarding a healthy seismic repair intervention of a damaged strcuture.

보수된 교량 교각의 보수 후의 내진응답 거동을 검토하기 위하여 보수요소를 이용하여 교각 및 교량구조물에 대한 비선형해석을 수행하였다. 본 연구목적을 위하여 단순화된 CFRP 재료의 응력-변형률 모델을 제안하였다. 본 연구에서 제안된 해석기법 및 모델링을 포함한 교각의 해석결과는 강도와 강성에 있어서 실험결과와 만족할 만한 상관관계를 나타내었다. 또한, 교각의 보수효과가 교량전체구조물에 미치는 영향을 검토하기 위하여 다양한 연속지진하중 조합을 작용시켜 교량구조물의 동적시간이력해석을 수행하였다. 이 해석에서는 교각의 이론적인 소성힌지 구간을 CFRP와 강판피복으로 보수하였고, 비교해석결과는 보수 후의 응답을 위해 보수효과를 직접적으로 반영한 해석의 필요성을 입증해 주었다. 결론적으로 본 연구에서 제안된 해석기법 및 모델은 손상된 구조물의 내진보수와 관련하여 유용한 정보를 제공해 줄 수 있을 것으로 사료된다.

Keywords

References

  1. 염광수, 최상현, 이영호, 이학은(2005), 강판피복과 CFRP를 이용한 손상된 교각의 내진보수, 한국지진공학회논문집, 한국지진공학회, 제9권, 제3호, pp. 69-75
  2. 이도형, 전정문 (2006), 시간종속 요소를 이용한 철근콘크리트교량 교각의 내진 성능 평가, 대한토목학회논문집, 대한토목학회, 제26권, 제1A호, pp. 237-246
  3. Broderick, B.M., Elnashai, A.S., Ambraseys, N.N., Barr, J., Goodfellow, R., and Higazy, M (1994), The Northridge (California) earthquake of 17 January 1994: observations, strong-motion and correlative analyses, Engineering Seismology and Earth-quake Engineering Report No. ESEE-94/4, Imperial College London
  4. Chai, Y.H., Priestley, M.J.N., and Seible, F. (1991), Seismic retrofit of circular bridge columns for enhanced flexural performance, ACI Structural Journal, Vol. 88, No. 5, pp. 572-584
  5. Elnashai, A.S., Papanikolaou, V., and Lee, D.H. (2001), ZeusNL-A program for inelastic dynamic analysis of structures, Mid-America Earthquake Center, University of Illinois at Urbana-Champaign, USA
  6. fib (2001), Externally bonded FRP reinforcement for RC structures, Technical report, Bulletin 14, International Federation for Structural Concrete
  7. Galal, K., Arafa, A., and Ghobarah, A. (2005), Retrofit of RC square short columns, Engineering Structures, 27, pp. 801-813 https://doi.org/10.1016/j.engstruct.2005.01.003
  8. Lehman, D.E., Gookin, S.E., Nacamuli, A.M., and Moehle, J.P. (2001), Repair of earthquake-damaged bridge columns, ACI Structural Journal, Vol. 98, No. 2, pp. 233-242
  9. Martinez-Rueda, J.E. and Elnashai, A.S. (1997), Confined concrete model under cyclic loading, Materials and Structures, 30, pp. 139-147 https://doi.org/10.1007/BF02486385
  10. Priestley, M.J.N, Seible, F., and Calvi, G.M. (1996), Seismic design and retrofit of bridges, John Wiley & Sons
  11. Priestley, M.J.N, Seible, F., Xiao, Y., and Verma, R. (1994a), Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-Part 1: theoretical considerations and test design, ACI Structural Journal, Vol. 91, No. 4, pp. 394-405
  12. Priestley, M.J.N, Seible, F., Xiao, Y., and Verma, R. (1994b), Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-Part 2: test results and comparison with theory, ACI Structural Journal, Vol. 91, No. 4, pp. 537-551
  13. Sheikh, S.A. (2002), Performance of concrete structures retrofitted with fibre reinforced polymers, Engineering Structures, 24, pp. 869-879 https://doi.org/10.1016/S0141-0296(02)00025-1
  14. Triantafillow, T.C. (2003), Seismic retrofitting using externally bonded fibre reinforced polymer(FRP), Chapter 5 of the fib bulletin: Seismic assessment & retrofit of RC buildings, fib course, Athens
  15. Xiao, Y. and Wu, H. (2003), Retrofit of reinforce concrete columns using partially stiffened steel jackets, Journal of Structural Engineering, ASCE, Vol. 129, No. 6, pp. 725-732 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:6(725)