DOI QR코드

DOI QR Code

The shear strength of RC rectangular sectional columns considering displacement ductility

변위연성도를 고려한 RC 사각단면 기둥의 전단강도

  • 선창호 (울산대학교 건설환경공학부) ;
  • 김익현 (울산대학교 건설환경공학부)
  • Published : 2010.04.30

Abstract

In order to attain enhanced seismic performance of RC bridges, premature shear failure prior to the achievement of target ductilities of the piers should be prevented. For this purpose, a reliable shear strength evaluation is required. The shear strength of an RC column subjected to a lateral force decreases with an increase in ductility. Many empirical equations for the shear strength have been proposed by many researchers. However, there are many discrepancies in the initial shear strength in the low ductility range, and in the decrease rate according to the ductility. In this study, a new empirical equation of shear strength considering the displacement ductility effect has been proposed, in which the initial shear strength equation proposed by the authors was revised on the basis of the investigation of many other researchers' test results. The resulting improvement in accuracy is confirmed by comparison with other empirical equations.

RC교량이 내진성능을 확보하기 위해서는 교각의 연성도가 목표연성도에 도달하기 전에 발생하는 전단파괴가 방지되어야 한다. 이를 위해서는 신뢰성 있는 전단강도 평가식이 요구된다. 횡하중을 받는 RC기둥의 전단강도는 변위연성도의 증가에 따라 감소 하는 특성을 나타낸다. 다수의 연구자에 의해 전단강도 식이 제안되어 있으나 변위연성도가 작은 구역에서의 초기전단강도와 연성도 증가에 따른 전단강도의 감소율에서 많은 차이를 보이고 있다. 본 연구에서는 저자들이 제안한 초기전단강도를 기본으로 하여 다른 연구자에 의해서 수행된 많은 기둥실험 결과를 분석하여 변위연성도를 고려한 새로운 전단강도 평가식을 제안하였다, 제안된 평가식은 다른 평가식과의 비교를 통해 정확도가 크게 개선된 것을 확인하였다.

Keywords

References

  1. 대한토목학회, 교량설계핵심기술연구단, “도로교설계기준 해설,” 2008.
  2. 이재훈, 황정길, 최진호, “원형 철근콘크리트 교각에 대한 연성도 내진설계법의 안정성,” 한국콘크리트학회 논문집, Vol. 20 No. 2, 193-202, 2008.
  3. 김익현, 김태곤, 이종석, 선창호, “중약진지역 다경간연속교의 내진성능 확보를 위한 합리적 내진상세,” 대한토목학회 정기학술대회논문집, 992-997, 2003.
  4. Xiao, Y., and Martirossyan, A., “Seismic performance of high-strength concrete columns.,” J. Struct. Eng., 124(3), 241-251, 1998. https://doi.org/10.1061/(ASCE)0733-9445(1998)124:3(241)
  5. Maekawa, K., and An, X., “Shear failure and ductility of RC columns after yielding of main reinforcement,” Engineering Fracture Mechanics 65, 335-368, 2000. https://doi.org/10.1016/S0013-7944(99)00119-8
  6. Priestley, M.J.N., Verma, R., and Xiao, Y., “Seismin Shear Strength of Reinforced Concrete Columns,” J. Struct. Eng., 120(8), 2310-2329, 1994. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:8(2310)
  7. Aschheim, M., Moehle, J.P., and Werner, S.D., Deformability of concrete columns, Project Report under Contract No.59Q122, California Dept. of Transportation, Division of Structures, Sacramento, Calif., June, 1992.
  8. Sezen, H., and Moehle, J.P., “Shear strength model for lightly reinforced concrete columns,” J. Struct. Eng., November, 1692-1703, 2004. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:11(1692)
  9. Kowalsky, M.J., and Priestley, M.J.N., “Improved Analytical model for shear strength of circular reinforced concrete columns in seismic regions,” ACI Struct. J., Title no. 97-S42, 2000.
  10. CALTRANS, “Memo to designers change letter 02,” California Dept. of Transportation, Sacramento, Calif., March, 1995.
  11. 선창호, 김익현. “횡하중을 받는 RC 중공단면 기둥의 초기전단강도,” 한국지진공학회 논문집, 제13권 제2호, 1-14, 2009. https://doi.org/10.5000/EESK.2009.13.2.001
  12. 국승규, 이재훈, 하동호, 김익현, 손혁수, 신뢰도기반 도로교 내진 설계기준안, 교량설계핵심기술연구단, KBRC TRS 011, 110pp.
  13. Yeh, Y.K., Mo, Y.L. Yang, C.Y., “Seismic Performance of Rectangular Hollow Bridge Columns,” Journal of structural Engineering, Vol. 128, 60-68, 2002. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:1(60)
  14. Mo, Y.L. Yeh, Y.K., and Hsieh, D.M., “Seismic Retrofit of Hollow Ractangular Bridge Columns.,” Journal of Composites for Construction, Vol. 8, 43-51, 2004. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:1(43)
  15. Cheng, C.-T. Mo, Y.L., and Yeh, Y.K., “Evaluation of As-Built, Retrofitted, and Repaired Shear-Critical Hollow Bridge Columns under Earthquake-Type Loading,” Asce Journal of Bridge Engineering, 520-529, 2005. https://doi.org/10.1061/(ASCE)1084-0702(2005)10:5(520)
  16. Mo, Y.L. Wong, D.C., and Maekawa, K., “Seismic Performance of Hollow Bridge Columns,” ACI Structure Journal, Vol. 100, 337-348, 2003.