2016년 9월 12일 M5.8 경주지진의 데미지 포텐셜 분석 및 내진공학 측면의 시사점

서지정보

· 발행기관 : 한국지진공학회
· 수록지 정보 : Jorunal of the Earthquake Engineering Society of Korea / 20권 / 7호
· 저자명 : 이철호, 박지훈, 김태진, 김성용, 김동관

목차

1. 서 론
2. 경주지진 계측 가속도기록 예비분석
3. 동일연성도스펙트럼 및 해외 강진과의 비교
3.1 동일연성도스펙트럼 비교분석
3.2 손상 포텐셜 비교연구
4. 지반효과
5. 경주지진에 의한 고층건물 지진응답 분석
6. 결 어
/ REFERENCES /

영어초록

This paper investigates seismic damage potential of recent September 12 M5.8 Gyeongju earthquake from diverse earthquake engineering perspectives using the accelerograms recorded at three stations near the epicenter. In time domain, strong motion durations are evaluated based on the accelerograms and compared with statistical averages of the ground motions with similar magnitude, epicentral distance and soil conditions, while Fourier analysis using FFT is performed to identify damaging frequency contents contained in the earthquake. Effective peak ground accelerations are evaluated from the calculated response spectra and compared with apparent peak ground accelerations and the design spectrum in KBC 2016. All these results are used to consistently explain the reason why most of seismic damage in the earthquake was concentrated on low-rise stiff buildings but not quite significant. In order to comparatively appraise the damage potential, the constant ductility spectrum constructed from the Gyeongju earthquake is compared with that of the well-known 1940 El Centro earthquake. Deconvolution analysis by using one accelerogram speculated to be recorded at a stiff soil site is also performed to estimate the soil profile conforming to the response spectrum characteristics. Finally, response history analysis for 39- and 61-story tall buildings is performed as a case study to explain significant building vibration felt on the upper floors of some tall buildings in Busan area during the Gyeongju earthquake. Seismic design and retrofit implications of M5.8 Gyeongju earthquake are summarized for further research efforts and improvements of relevant practice.

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