• 한국재난정보학회 논문집
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• 제19권4호
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• pp.882-896
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• 2023

연구목적: 국가산업단지 공장시설물이 보유한 내진설계의 잠재적 위험과 안전지도 및 점검의 미비점을 효과적으로 향상시킬 수 있는 안전관리 및 내진보강대책 마련을 목적으로 한다. 연구방법: 본 연구에서는 국가산업단지의 지진재난 대비 안전관리 현황 및 관리체계 등 지진재난 안전관리 전반에 관한 조사·분석을 통해 문제점 및 개선방안을 도출하였고, 국가산업단지 내 입주기업체 내진설계 실태조사를 실시하여 시설유형과 구조적 특성에 기반한 개선방안을 제시하였다. 연구결과: 결론적으로 국가산업단지 지진재난 대비 안전관리 및 내진보강에 대한 문제점을 정리하여 4가지 유형별(내진성능 평가 및 관련 제도 보완, 입주기업 및 지자체 권한, 내진보강 및 안전관리 지원대책, 조직의 역량강화)로 개선방안을 도출하였다. 결론: 이를 기반으로 국가산업단지 입주기업이 지진재난을 대비하여 추진해야 하는 내진보강 대책을 마련하였으며, 각 대책별 세부적인 방안을 제시하였다.

• Earthquakes and Structures
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• 제9권5호
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• pp.1091-1114
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• 2015

The adequacy of a number of advanced earthquake Intensity Measures (IMs) to predict the structural damage of earthquake resistant 3D R/C buildings is investigated in the present paper. To achieve this purpose three symmetric in plan and three asymmetric 5-storey R/C buildings are analyzed by nonlinear time history analysis using 74 bidirectional earthquake records. The two horizontal accelerograms of each ground motion are applied along the structural axes of the buildings and the structural damage is expressed in terms of the maximum and average interstorey drift as well as the overall structural damage index. For each individual pair of accelerograms the values of the aforementioned seismic damage measures are determined. Then, they are correlated with several strong motion scalar IMs that take into account both earthquake and structural characteristics. The research identified certain IMs which exhibit strong correlation with the seismic damage measures of the studied buildings. However, the degree of correlation between IMs and the seismic damage depends on the damage measure adopted. Furthermore, it is confirmed that the widely used spectral acceleration at the fundamental period of the structure is a relatively good IM for medium rise R/C buildings that possess small structural eccentricity.

• 한국공간구조학회논문집
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• 제12권2호
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• pp.55-63
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• 2012

본 연구는 학교 건물의 구조적 성능 평가를 통한 내진보강에 대한 연구이다. 본 연구의 목적은 학교 건물의 구조적 성능평가를 통하여 안전성과 사용성을 고려한 구조보강방안을 비교분석하고 합리적 내진 보강안을 제시하여 보다 지진에 안전한 건축물을 유지하는데 도움 이 되고자 한다. 이 목적을 위해 기존의 학교건물을 연구 대상으로 선정하여 내진성능평가를 실시하고 내진 보강안을 제시하였다. 본 연구의 방법은 기존의 철근콘크리트 학교건물을 대상으로 1차 내진 성능평가와 2차 내진 성능평가를 실시하였다. 위와 같은 방법으로 내진성능평가를 하여 그 결과를 분석하고 내진보강방안을 제시(강재댐퍼, 탄소막대보강재)하였다. 제시된 내진 보강방안을 대상 건축물에 적용하여 내진보강 전, 후의 내진성능평가를 통해 종합적인 결과를 도출 하였다.

• 한국지진공학회논문집
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• 제18권1호
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• pp.29-36
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• 2014

In industrial facilities sites, the conventional method determining the earthquake magnitude (M) using earthquake ground-motion records is generally not applicable due to the poor quality of data. Therefore, a new methodology is proposed for determining the earthquake magnitude in real-time based on the amplitude measures of the ground-motion acceleration mostly from S-wave packets with the higher signal-to-ratios, given the Vs30 of the site. The amplitude measures include the bracketed cumulative parameters and peak ground acceleration (As). The cumulative parameter is either CAV (Cumulative Absolute Velocity) with 100 SPS (sampling per second) or BSPGA (Bracketed Summation of the PGAs) with 1 SPS. The arithmetic equations to determine the earthquake magnitude are derived from the CAV(BSPGA)-As-M relations. For the application to broad ranges of earthquake magnitude and distance, the multiple relations of CAV(BSPGA)-As-M are derived based on worldwide earthquake records and successfully used to determine the earthquake magnitude with a standard deviation of ${\pm}0.6M$.

• Earthquakes and Structures
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• 제23권1호
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• pp.75-85
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• 2022

The megacity Istanbul was struck by an earthquake on September 26, 2019, with a moment magnitude (Mw) of 5.8. The mainshock was followed by many aftershocks. Although the peak ground acceleration (PGA) of the mainshock was as low as 0.08 g, its effect has been more than expected. The intensive reconnaissance studies were accomplished in the highly populated Zeytinburnu and Pendik districts of Istanbul. While the earthquake (EQ) was relatively smaller concerning record-specific intensity measures; the damages such as concrete spalling in reinforced concrete (RC) members, detachment and diagonal cracking of infill walls in RC frames as well as cracks in masonry structures were reported from non-engineered and some engineered buildings. Many studies in the literature state that record-specific intensity measures are not sufficient to evaluate the seismic performance of the structures. The structure-specific intensity measures, soil characteristics, as well as significant duration, energy, and frequency content of EQs should be considered for the evaluation. Dependently, the frequency and energy contents of the Istanbul Earthquake are evaluated to discuss the possible reasons for the perceived effects and the damages. It is concluded that the EQ caused resonance effects on a variety of structures because of its complex frequency content as well as rather low building quality.

• 한국지진공학회논문집
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• 제3권2호
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• pp.19-28
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• 1999

건물과 교량의 내진설계기준 제정작업이 활발하게 진행되고 있는 반면 탱크구조물에 대한 내진설계기준 제정작업은 아직 초기단계에 머무르고 있는 실정이다 탱크구조물이 지진에 의해 붕괴되는 경우 탱크자체의 파손 및 저장물의 손실에 의한 직접피해보다 저장물의 유출에 의한 피해파급이 더욱 심각한 상황을 초래할 수 있다 따라서 탱크구조물의 내진설계기준에는 탱크구조물의 동적 거동에 대한 해석 및 검토방법은 물론 이러한 피해파급을 최소할 수 잇는 조치가 포함되어야 한다 이논문에서는 원통형 액체저장 강탱크에 대한 내진설계기준의 제정에 필수적으로 고려해야 하는 설계개념과 원칙 해석방법 검토사항 및 피해파급 차단초치를 제시하였다.

• Structural Engineering and Mechanics
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• 제66권6호
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• pp.749-759
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• 2018

Aiming at widely used high-pier bridges in Sichuan-Tibet Railway, this paper presents an investigation to design and evaluate the seismic vibration reduction effects of several measures, including viscous damper (VD), friction pendulum bearing (FPB), and tuned mass damper (TMD). Primarily, according to the detailed introduction of the concerned bridge structure, dynamic models of high-pier bridges with different seismic vibration reduction (SVR) measures are established. Further, the designs for these SVR measures are performed, and the optimal parameters of these measures are investigated. On this basis, the vibration reduction effects of these measures are analyzed and assessed subject to actual earthquake excitations in Wenchuan Earthquake (M=8.0), and the most appropriate SVR measure for high-pier bridges in Sichuan-Tibet Railway is determined at the end of the work. Results show that the height of pier does not obviously affect the performances of the concerned SVR measures. Comprehensively considering the vibration absorption performance, installation and maintenance of all the employed measures in this paper, TMD is the best one to absorb vibrations induced by earthquakes.

• Nuclear Engineering and Technology
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• 제50권3호
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• pp.494-503
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• 2018

As public acceptance of nuclear energy in Korea worsens due to the Fukushima accident and the earthquakes that occurred in the Gyeongju area near the Wolsong nuclear power plant (NPP), estimating the effects of earthquakes has become more essential for the nuclear industry. Currently, most countermeasures against earthquakes are limited to large-scale disasters. Minor-scale earthquakes used to be ignored. Even though people do not feel the shaking due to minor earthquakes and minor earthquakes incur little damage to NPPs, they can change the environmental conditions, for instance, underground water level and the conductivity of the groundwater. This study conducted a questionnaire survey of residents living in the vicinity of an NPP to determine their perception and acceptance of plant safety against minor earthquakes. The results show that the residents feel earthquakes at levels that can be felt by people, but incur little damage to NPPs, as minor earthquakes (magnitude of 2.0-3.9) and set this level as a standard for countermeasures. Even if a minor earthquake has little impact on the safety of an NPP, there is still a possibility that public opinion will get worse. This study provides analysis results about problems of earthquake measures of Korean NPPs and specific things that can bring about an effect of deterioration of public acceptance. Based on these data, this article suggests that active management of minor earthquakes is necessary for the sustainability of nuclear energy.

• Geomechanics and Engineering
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• 제33권5호
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• pp.487-506
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• 2023

Looking from the past to the present, the earthquakes can be said to be type of disaster with most casualties among natural disasters. Soil liquefaction, which occurs under repeated loads such as earthquakes, plays a major role in these casualties. In this study, analytical equation models were developed to predict the probability of occurrence of soil liquefaction. In this context, the parameters effective in liquefaction were determined out of 170 data sets taken from the real field conditions of past earthquakes, using WEKA decision tree. Linear, Exponential, Power and Quadratic models have been developed based on the identified earthquake and ground parameters using Krill Herd algorithm. The Exponential model, among the models including the magnitude of the earthquake, fine grain ratio, effective stress, standard penetration test impact number and maximum ground acceleration parameters, gave the most successful results in predicting the fields with and without the occurrence of liquefaction. This proposed model enables the researchers to predict the liquefaction potential of the soil in advance according to different earthquake scenarios. In this context, measures can be realized in regions with the high potential of liquefaction and these measures can significantly reduce the casualties in the event of a new earthquake.

• 조명전기설비학회논문지
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• 제22권12호
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• pp.150-156
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• 2008

최근 한반도 주변국인 일본, 중국 등에서 크고 작은 지진 발생으로 많은 인명 및 재산 피해를 보고 있다. 국내에서도 지진 발생 횟수가 꾸준히 증가하여 이에 대한 대책을 세우기 위해 자연재해대책법에서 지진 관련 부분을 지진재해대책법으로 2008년 3월에 제정하여 세부시설에 대한 지진 대책 제시 및 이를 강화하고 있다. 본 논문은 지진 발생시 건축물에서 위급상황에 대한 대처 및 여러 가지 구제 활동에 필수적인 전원공급 장치인 수변전실의 전기설비 지진 대책에 관하여 국내 현황 및 문제점을 분석하려다. 또한 국외의 전기설비에 대한 내진 설계 및 시설에 관한 규정을 조사 분석하여 국내 건축물 수변전설비의 내진 설계 및 시공 방향을 제시하였다. 추후로 건축물 수변전실의 전기설비 내진설계 방법 제시 및 그에 따른 시공의 신뢰성 검증을 위한 검사 점검 부분에 대한 연구가 필요하다고 판단된다.