Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Modal Combination Method for Prediction of Story Earthquake Load Profiles

층지진하중분포 예측을 위한 모드조합법

  • 엄태성 (포항산업과학연구원 강구조연구소) ;
  • 이혜린 (서울대학교 공과대학 건축학과 대학원) ;
  • 박홍근 (서울대학교 공과대학 건축학과)
  • Published : 2006.06.30
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Abstract

Nonlinear pushover analysis is used to evaluate the earthquake response of building structures. To accurately predict the inelastic response of a structure, the prescribed story load profile should be able to describe the earthquake force profile which actually occurs during the time-history response of the structure. In the present study, a new modal combination method was developed to predict the earthquake load profiles of building structures. In the proposed method, multiple story load profiles are predicted by combining the modal spectrum responses multiplied by the modal combination factors. Parametric studies were performed far moment-resisting frames and walls. Based on the results. the modal combination factors were determined according to the hierarchy of each mode affecting the dynamic responses of structures. The proposed modal combination method was applied to prototype buildings with and without vertical irregularity. The results showed that the proposed method predicts the actual story load profiles which occur during the time-history responses of the structures.

건물의 지진응답을 평가하기 위하여 비선형 푸시오버 해석을 수행한다. 구조물의 비탄성 지진응답을 정확히 예측하기 위해서는, 비선형해석에 사용되는 층하중분포가 구조물의 시간이력 지진응답 동안 실제로 발생되는 지진하중분포를 나타낼 수 있어야 한다. 본 연구에서는 건축물의 지진하중분포를 예측하기 위하여 새로운 모드조합법을 개발하였다. 개발된 모드조합법에서는 모드조합계수를 곱한 각 모드의 스펙트럼응답을 조합하여 다수의 지진하중분포를 예측한다. 모멘트 골조와 켄틸레버 벽체에 대한 변수연구를 수행하였다. 변수연구 결과를 토대로, 각 고유모드가 구조물의 지진응답에 미치는 영향을 나타내는 모드조합계수를 정의하였다. 다양한 정형 및 수직 비정형 구조물에 대하여 제안된 계수모드조합법을 적용하였다. 그 결과 제안된 모드조합법은 시간이력 응답 동안 구조물에 실제로 발생되는 지진하중분포를 정확히 예측할 수 있었다.

Keywords

References

  1. ATC, Seismic Evaluation and Retrofit of Concrete Buildings, ATC-40 Report, Applied Technology Council, Redwood City, California, 1996
  2. Priestley, M.J.N, 'Performance Based Seismic Design,' Paper No. 2831, 12th World Conference on Earthquake Engineering (WCEE), 2000
  3. Chopra, A. K. and Goel, R. K., 'A modal pushover analysis procedure for estimating seismic demands for buildings,' Earthquake Engineering and Struct. Dyn., Vol. 3, pp. 561-582
  4. American Society of Civil Engineers (ASCE), Prestandard and Commentary for the Seismic Rehabilitation of Buildings, Federal Emergency Management Agency, Washington, D. C., 2000
  5. Requena, M. and Ayala, A. G., 'Evaluation of a simplified method for the determination of the nonlinear seismic response of RC frames,' Proceedings of the Twelfth World Conference on Earthquake Engineering, Auckland, New Zealand, 2000
  6. Lee, D. G., Choi, W. H. and Ahn, J. H., 'Improved Distribution of Seismic Forces for Evaluation of Nonlinear Seismic Response of Building Structures,' Journal of Earthquake Engineering Society of Korea, Vol. 5, No.2, 2002, pp. 33-47
  7. Kunnath, S. K., 'Identification of Modal Combinations for Nonlinear Static Analysis of Building Structures,' Computer-Aided Civil and Infrastructure Engineering, Vol. 19, 2004, pp. 246-259 https://doi.org/10.1111/j.1467-8667.2004.00352.x
  8. Matsumori, T., Otani, S., Shiohara, H. and Kabeyasawa, T., 'Earthquake member deformation demands in reinforced concrete frame structures,' Proceedings of the US-Japan Workshop on Performance-Based Earthquake Engineering Methodology for RC Building Structures, PEER Center Report, UC Berkeley, 1999, pp. 79-94
  9. 건축물 하중기준, 대한건축학회, 2005