Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
권호 표지
DOI QR코드

DOI QR Code

Statistical Study of Ductility Factors for Elastic Perfectly Plastic SDOF Systems

탄소성 단자유도 구조물에 대한 연성계수의 통계적 분석

  • Published : 2003.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper present a summary of the results of statistical study of the ductility factor which is key component of response modification factor(R). To compute the ductility factor, a group of 1,860 ground motions recorded from various earthquake was considered. Based on the local site conditions at the recording station, ground motions were classified into four groups according to average shear wave velocity. Inleastic spectrum were computed for elastic perfectly plastic SDOF systems undergoing different level of inelastic deformation and period. Ductility factors were calculated by deviding elastic response spectrum by inelastic response spectrum. The influence f displacement ductility ratio, site condition, magnitude and epicentral distance on ductility factors were studied. The coefficient of variation was computed to evaluated the dispersion of ductility factors as the defined ratio of the standard deviation to the mean.

반응수정계수의 핵심구성요소인 연성계수에 대하여 통계적 분석을 수행하였다. 연성계수의 체계적인 산정을 위하여 총 1,860개의 지진기록을 수집하였다. 수집된 지진기록을 지반 전단파의 평균속도에 따라 4가지로 분류하고, 탄소성 이력거동을 가지는 단자유도 구조물에 대하여 비탄성 스펙트럼을 작성하였다. 작성된 비탄성 스펙트럼으로부터 연성계수를 구하고, 변위연성비, 토질조건, 규모 및 진앙거리가 연성계수에 미지는 영향을 분석하였다. 토질 조건별로 평균연성계수를 구하고, 산정된 연성계수의 산포도를 검토하기 위하여 변동계수를 산정하였다.

Keywords

References

  1. ATC, “Structural response modification factors,” ATC Report 19, Redwood City, 1995, p. 64.
  2. ATC, “A critical review of current approaches to earthquake-resistant design,” ATC Report 34, Redwood City, 1995, p. 94.
  3. Rodriguez-Marek, A., Bray, J. D., and Abrahamson, N., “Characterization of site response general site categories,” PEER Report 1999/03, University of California, Berkeley, 1999, p. 252.
  4. Hachem, M. M., BISPEC Version 1.1.2, University of California, Berkeley, 2000.
  5. Mahin, S. A. and Lin, J., “Construction of inelastic response spectra for single-degree-of-freedom systems: Computer program and applications,” UCB/EERC-83/17, Earthquake Engineering Research Center, University of California, Berkeley, 1983. 6, p. 87.
  6. Chopra, A. K, Dynamics of Structures, Theory and Applications to Earthquake Engineering, Prentice-Hall, 1995, p. 729.
  7. Newmark, N. M. and Hall, W. J., “Earthquake spectra and design,” Earthquake Engineering Research Institute, Berkeley, 1982, p. 488.
  8. Bertero, V. V., Anderson, J. C., Krawinkler, H., and Miranda, E., “Design guidelines for ductility and drift limits,” Earthquake Engineering Research Center Report, Report No. UCB/EERC 91-15, UC at Berkely, California, 1991. 7, p. 146.
  9. Kang, C. K. and Choi, B. J., “Empirical estimation of ductility factors for elasto-plastic SDOF systems in alluvium sites,” The 2nd International Symposium on Steel Structures, 2002, pp. 533-542.
  10. Korea National Housing Corporation, “Evaluation of the response modification factor(R) for wall-typed apartment building structures,” Korea National Housing Corporation, 1998. 12, p. 302.
  11. Miranda, E., “Evaluation of site-dependent strength reduction factors,” Journal of Structural Engineering, ASCE, Vol. 119, No. 12, 1993, pp. 3503-3519. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:12(3503)
  12. Miranda, E. and Bertero, V. V., “Evaluation of strength reduction factors for earthquake resistant design,” Earthquake Spectra, Earthquake Engineering Research Institute, Vol. 10, No. 2, 1994, pp. 357-379. https://doi.org/10.1193/1.1585778
  13. Lee, H. H. and Han, S. W., “Evaluation of inelastic demand for elasto perfectly plastic and bilinear model,” Journal of Architectural Institute of Korea, Vol. 16, No. 9, 2000, pp. 27-34.
  14. Lee, H. H., “Hysteretic characteristics of inelastic demand spectra,” Journal of Architectural Institute of Korea, Vol. 18, No. 9, 2002, pp. 77-84.
  15. Nassar, A. A. and Krawinkler, H., “Seismic demands for SDOF and MDOF systems,” John A. Blume Earthquake Engineering Center, Report No. 95, Stanford University, California, 1991, p. 204.
  16. Borzi, B. and Elnashai, A. S., “Refined force reduction factors for seismic design,” Engineering Structures, Vol. 22, 2000, pp. 1244-1260. https://doi.org/10.1016/S0141-0296(99)00075-9
  17. Tiwari, A. K. and Gupta, V. K., “Scaling of ductility and damage-based strength reduction factors for horizontal motions,“ Journal of Earthquake Engineering and Structural Dynamics, Vol. 29, 2000, pp. 969-987. https://doi.org/10.1002/1096-9845(200007)29:7<969::AID-EQE948>3.0.CO;2-N
  18. Lam, N., Wilson, J., and Hutchinson, G., “The ductility reduction factor in the seismic design of buildings,” Journal of Earthquake Engineering and Structural Dynamics, Vol. 27, 1998, pp. 749-769. https://doi.org/10.1002/(SICI)1096-9845(199807)27:7<749::AID-EQE761>3.0.CO;2-L