비선형시간이력해석을 위한 건축물의 고유주기와 지진파의 평균주기가 연동된 설계지진파 선정방법 (Design Ground Motion Selecting Method for Nonlinear Time History Analysis by Correlating Fundamental Period and Mean Period)

서지정보

· 발행기관 : 대한건축학회
· 수록지 정보 : 대한건축학회논문집 / 38권 / 5호 / 169 ~ 176페이지
· 저자명 : 김강산, 최인섭, 김준희

초록

비선형시간이력해석(nonlinear time history analysis, NTHA)는 비정형 건축물의 정밀한 지진응답을 도출할 수 있어, 내진설계에 활발히 사용되고 있다. 본 연구에서는 건축물의 고유주기와 지반운동의 평균주기를 연관시켜 NTHA에 사용되는 설계지반운동의 선정방법을 개발하였다. 총 200개의 지반운동에 대한 RC필로티 건축물의 NTHA를 통해, 최대 변위와 평균주기로 정규화된 고유주기 사이의 관계가 설정되었다. 제안된 방법으로 선택한 지진파는 고유주기와 평균주기의 비율이 0.75~1.5에서 높은 신뢰도를 가진다.

영어초록

Nonlinear time history analysis (NTHA) has become a considerable option for seismic design. For complex and irregular structures, a NTHA derives realistic displacement that leads to efficient seismic design. However, regions without sufficient earthquake records face issues when determining which earthquake is most suitable for their site condition. In this study, a selection method for design ground motion used in the nonlinear time history analysis was developed by correlating the fundamental period of buildings and the mean period of ground motions. From existing literature, the relationship between the maximum displacement and the fundamental period normalized to the mean period was determined. A total of 200 NTHA was performed to establish the relationship of reinforced concrete (RC) piloti-type structures by statistically correlating them between the fundamental period and the mean period with the maximum displacement. By statistical means from RC piloti structure’s NTHA distribution, the regression curve and the 70% confidence interval were derived. This correlation determined the period ratio range category where the earthquake’s NTHA displacements were compared to the pseudo displacement of the design spectrum method. For the suggested piloti prototype model, it was concluded that the period ratio of 0.75-1.5 was a category that could determine whether the earthquake’s NTHA displacement was greater or less than the linear elastic response spectrum method.

참고자료

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