Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Evaluation of Applicability of Impulse function-based Algorithm for Modification of Ground Motion to Match Target Response Spectrum

Impulse 함수 기반 목표응답스펙트럼 맞춤형 지진파 보정 알고리즘의 적용성 평가

  • 김현관 (한양대학교 공과대학 건설환경공학과) ;
  • 박두희 (한양대학교 공과대학 건설환경공학과)
  • Received : 2011.02.25
  • Accepted : 2011.03.17
  • Published : 2011.04.01
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Abstract

Selection or generation of appropriate input ground motion is very important in performing a dynamic analysis. In Korea, it is a common practice to use recorded strong ground motions or artificial motions. The recorded motions show non-stationary characteristics, which is a distinct property of all earthquake motions, but have the problem of not matching the design response spectrum. The artificial motions match the design spectrum, but show stationary characteristics. This study generated ground motions that preserve the non-stationary characteristics of a real earthquake motion, but also matches the design spectrum. In the process, an impulse function-based algorithm that adjusts a given time series in time domain such that it matches the target response spectrum is used. Application of the algorithm showed that it can successfully adjust any recorded motions to match the target spectrum and also preserve the non-stationary characteristics. The modified motions are used to perform a series of nonlinear site response analyses. It is shown that the results using the adjusted motions result in more reliable estimates of ground vibration. It is thus recommended that the newly adjusted motions be used in practice instead of original recorded motions.

동적 지진해석 수행 시 적절한 입력지진파를 선정 생성하는 것은 매우 중요하다. 현재 국내에서는 일반적으로 국외에서 계측된 강진 기록이나 인공지진파가 입력지진파로 사용된다. 계측지진기록은 지진파의 고유성질인 시간에 따라서 주파수 특성이 변이하는 비정상(Non-Stationary) 특성을 가지고 있지만 설계 응답스펙트럼과는 일치하지 않으며 주파수영역에서 생성된 인공지진파는 설계 응답스펙트럼과는 일치하지만 정상(Stationary) 특성을 가지고 있는 단점이 있다. 본 연구에서는 계측기록의 Non-stationary 특성을 보존하되 동시에 설계 응답스펙트럼에 상응하는 지진파를 생성하였다. 적용된 기법은 Impulse 함수를 이용하여 시간영역에서 지진기록을 목표 스펙트럼에 상응하도록 보정하는 알고리즘이다. 적용 결과, 시간영역 변화 알고리즘은 성공적으로 계측 지진기록을 설계 응답스펙트럼와 일치하도록 조정할 수 있으며 원 지진기록의 Non-stationary 특성을 보존하는 것으로 나타났다. 나아가 계측 지진기록과 보정된 지진기록을 적용한 비선형 지반응답해석을 수행한 결과, 보정된 지진파를 이용한 결과가 보다 합리적인 것으로 나타났다. 본 연구에서 변환된 지진기록은 기존 기록의 문제점을 보완하는 진보된 입력지진파인 것으로 나타났으며 추후 지진해석 시 이를 준용하는 것이 합리적일 것으로 판단된다.

Keywords

Acknowledgement

Grant : 내진설계를 위한 대표 지진파 생성 모듈 개발

Supported by : 한국학술진흥재단

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