• 한국지진공학회논문집
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• 제22권7호
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• pp.391-399
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• 2018

The site coefficients in the common requirements for seismic design codes, which were promulgated in 2017, were reevaluated and the standard design spectrum for soil sites were newly proposed in order to ensure the consistency of the standard design spectra for rock and soil sites specified in the common requirements. Using the 55 ground motions from domestic and overseas intraplate earthquakes, which were used to derive the standard design spectrum for rock sites, as rock outcropping motions, site response analyses of Korean soil were performed and its ground-motion-amplification was characterized. Then, the site coefficients for soil sites were reevaluated. Compared with the existing site coefficients, the newly proposed short-period site coefficient $F_a$ increased and the long-period site coefficient $F_v$ decreased overall. A new standard design spectrum for soil sites was proposed using the reevaluated site coefficients. When compared with the existing design spectrum, it could be seen that the proposed site coefficients and the standard design spectrum for soil sites were reasonably derived. They reflected the short-period characteristics of earthquake and soil in Korea.

• 조명전기설비학회논문지
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• 제25권11호
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• pp.26-32
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• 2011

In this study, a standard illuminant A type LED that has similar emission spectrum as the standard illuminant A was developed using LED chip(emission peak: 405[nm]) and four types of phosphors(blue, green orangered and red). Using the design of experiment for spectrum control, the trend of the change of spectrum shape influenced by the change of interaction among phosphors and their density could be examined. Computer simulation through the optimization of the design of experiment revealed that, among four phosphors, the most influential one on the shape of the spectrum was green phosphor. Using the obtained optimal combination ratio of the four phosphors, an alternative LED illuminant to the actual standard illuminant A was developed and the spectrums of these two were confirmed identical. Using this standard illuminant A type LED, a portable transmittance meter with the range of measurement error of ${\pm}1.0$[%] was developed.

• 한국지진공학회논문집
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• 제20권6호
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• pp.369-378
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• 2016

The design spectrum for Korea, which is known to belong to an intra-plate region, is developed from the ground motion records of the earthquakes occurred in Korea and overseas intra-plate regions. The horizontal spectrum is defined as geometric mean spectrum, GMRotI50. From the statistical analysis of the geometric mean spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. The developed design spectrum is valid for the estimation both spectral acceleration and displacement.

• 한국구조물진단유지관리공학회 논문집
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• 제24권5호
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• pp.27-36
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• 2020

이 논문의 목적은 말뚝식 계류시설에 대해 현행 실무에서 주로 적용하고 있는 응답스펙트럼 해석법에서 표준설계응답스펙럼의 적용성에 대해 연구하는 것이다. 이를 위하여 다양한 지층조건을 고려한 Proshake 1차원 부지응답을 수행하여 현행 표준설계응답스펙트럼과 비교하고, Abaqus를 활용한 지반-말뚝 모델링으로 시간이력해석을 수행하여 지반-말뚝 동적거동 특성을 분석하였으며, 잔교시설이 설치되는 경사지반에 대해 Abaqus를 활용한 2차원 부지응답해석을 수행하여 응답스펙트럼의 기준면 선정방안을 검토하였다. 연구 결과 말뚝식 계류시설의 지반-말뚝 동적거동 특성과 경사지반의 특성을 고려할 경우 현행 표준설계응답스펙트럼의 적용성에 문제가 있으며 개선이 필요하다는 것을 확인하였다.

• 한국지진공학회논문집
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• 제21권6호
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• pp.277-286
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• 2017

On September 12, 2016, Gyeongju earthquake occurred. Its local magnitude was announced to be $M_L=5.8$ by Korea Meteorological Administration (KMA). Ground motion data recorded at KMA, EMC and KERC stations was obtained from their data bases. From the data, horizontal and vertical response spectra, and V/H ratio were calculated. The horizontal spectrum was defined as geometric mean spectrum, GMRotI50. From the statistical analysis of the geometric mean spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. Applying the same procedure, the shape and transition periods of vertical spectrum was obtained. These results were compared with the Korean standard design spectra, which were developed from domestic and overseas intraplate earthquake records. The response spectra of Gyeongju earthquake were found to be almost identical with the newly proposed design spectra. Even the V/H ratios showed good agreement. These results confirmed that the method adopted when developing the standard design spectra were valid and the developed design spectra were reliable.

• 한국지진공학회논문집
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• 제27권6호
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• pp.245-252
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• 2023

In general, the design response spectrum in seismic design codes is based on the mean-plus-one-standard deviation response spectrum to secure high safety. In this study, response spectrum analysis was performed using seismic wave records adopted in domestic horizontal design spectrum development studies, while three response spectra were calculated by combining the mean and standard deviation of the spectra. Seismic wave spectral matching generated seismic wave sets matching each response spectrum. Then, seismic fragility was performed by setting three damage levels using a single-degree-of-freedom system. A correlation analysis was performed using a comparative analysis of the change in the response spectrum and the seismic fragility concerning the three response spectra. Finally, in the case of the response spectrum considering the mean and standard deviation, like the design response spectrum, the earthquake load was relatively high, indicating that conservative design or high safety can be secured.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.75-80
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• 2000

Evaluation method of seismic performance has mainly used elastic spectrum analysis. This method has simplicity of analysis but deficiency of accuracy. And evaluation method of seismic performance using inelastic dynamic analysis reflects accurately inelasticity of material but hardly reflects site effects. This study suggested evaluation scheme of seismic performance for bridge structure using capacity spectrum method applied inelastic static analysis and standard design response spectrum of Korea Standard Specification for Highway Bridge. Two results, capacity spectrum method and inelastic dynamic analysis method, are very similar. As a result, this study appropriately supply both simplicity of analysis and accuracy of result.

• 한국지진공학회논문집
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• 제20권6호
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• pp.413-424
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• 2016

The vertical design spectrum for Korea, which is known to belong to an intra-plate region, is developed from the ground motion records of the earthquakes occurred in Korea and overseas intra-plate regions. From the statistical analysis of the vertical response spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. The developed design spectrum is valid for the estimation both spectral acceleration and displacement. The ratio of vertical to horizontal response spectrum for each record is calculated. Statistical analysis of the ratios rendered the vertical to horizontal ratio (V/H ratio). Subsequently the ratio between the peak vertical ground acceleration to the horizontal one is obtained.

• 한국지진공학회논문집
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• 제22권3호
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• pp.129-137
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• 2018

On November 15, 2017, Pohang earthquake occurred. Its local magnitude was announced to be $M_L=5.4$ by Korea Meteorological Administration (KMA). Ground motion data recorded at KMA stations were obtained from their data bases. From the data, horizontal and vertical response spectra, and V/H ratio were calculated. The horizontal spectra were defined as GMRotI50 spectra. From the statistical analysis of the GMRotI50 spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. Applying the same procedure, the shape and transition periods of vertical spectrum were obtained. These results were compared with theKorean standard design spectra, which were developed from domestic and overseas intra-plate earthquake records, and Gyeongju earthquake response spectra. The response spectra of Pohang earthquake were found to be almost identical with the newly proposed design spectra. Even the V/H ratios showed good agreement. These results confirmed that the method adopted when developing the standard design spectra were valid and the developed design spectra were reliable.

• 지구물리와물리탐사
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• 제14권4호
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• pp.274-281
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• 2011

최근 백령도 해역에서 발생한 규모 4.3에 해당하는 중규모 지진(2011년 6월 17일)으로부터 관측된 지반진동 파형을 이용하여 지진원 기구 및 수평 응답스펙트럼을 분석하였다. 분석결과를 한반도의 응력방향과 비교하였고 또한 국내 원자력 관련 구조물의 내진설계 기준과 국내 일반 구조물 및 건축물 내진설계기준과 각각 비교하였다. 지진원 연구에 이용된 지반진동은 3개 관측소(각 관측소에서 3성분)에서 관측된 전파형에 대해 모멘트텐서 기본식을 이용한 격자탐색법을 적용하여 분석하였다. 지진원기구에서 제시하는 주압축응력 방향은 ENE-WSW 방향으로 기존 한반도 전체의 주 응력방향과 대체로 유사하였다. 원자력 관련 구조물의 내진설계 기준과 국내 일반 구조물 및 건축물 내진설계기준과 각각 비교하였다. 국내 원자력시설물의 내진기준으로 이용되고 있는 Reg. Guide 1.60과 비교한 결과 특히 약 3 Hz 이상의 높은 고유진동수 영역에서 Reg. Guide 1.60 기준보다 높은 값을 보여 주었다. 또한 국내 일반 구조물 및 건축물 내진설계기준인 표준 설계응답스펙트럼을 비교한 결과 약 0.8초 이하의 단주기 영역의 전체 대역(SD 지반조건)에서 자료처리 결과가 기준을 크게 초과하였다. 향후 국내 지진활동 실정에 적합한 내진설계 기준 마련을 위해 관측자료의 질적 향상 및 양적인 축적 등을 통하여 특히 높은 고유진동수 대역에서 수평응답스펙트럼 기준의 보수성을 재고할 필요가 있다.