• 한국전산구조공학회논문집
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• 제26권6호
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• pp.415-421
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• 2013

본 논문에서는 면진시스템이 원전에 적용될 경우 원전구조물의 생애주기 성능에 미치는 영향을 소개한다. 최근 내진설계와 더불어 강진발생 예상 지역에 적용을 목적으로 개발되는 면진시스템은 구조물을 장주기화하여 응답가속도를 줄이고 상대변위를 늘려줌으로써 구조물의 안전성을 증진시키는 것으로 알려져 있다. 따라서, 구조물의 안전성이 중요시되는 원전구조물에 면진시스템을 적용하기 위한 연구가 국내에서 진행 중에 있다. 본 연구에서는 원전구조물의 생애주기 성능분석에 있어서 특징을 분석하고, 면진시스템이 적용될 경우 원전구조물의 생애주기성능에 있어서 미치는 영향을 평가함으로써, 도출된 결과를 면진시스템 적용의 정량적인 타당성 평가에 활용할 수 있다.

• 한국지진공학회논문집
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• 제24권6호
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• pp.293-303
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• 2020

Seismic fragility was assessed for non-seismic reinforced concrete shear walls in Korean high-rise apartment buildings in order to implement an earthquake damage prediction system. Seismic hazard was defined with an earthquake scenario, in which ground motion intensity was varied with respect to prescribed seismic center distances given an earthquake magnitude. Ground motion response spectra were computed using Korean ground motion attenuation equations to match accelerograms. Seismic fragility functions were developed using nonlinear static and dynamic analysis for comparison. Differences in seismic fragility between damage state criteria including inter-story drifts and the performance of individual structural members were investigated. The analyzed building had an exceptionally long period for the fundamental mode in the longitudinal direction and corresponding contribution of higher modes because of a prominently insufficient wall quantity in such direction. The results showed that nonlinear static analyses based on a single mode tend to underestimate structural damage. Moreover, detailed assessments of structural members are recommended for seismic fragility assessment of a relatively low performance level such as collapse prevention. On the other hand, inter-story drift is a more appropriate criterion for a relatively high performance level such as immediate occupancy.

• 한국방재학회 논문집
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• 제7권5호
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• pp.139-150
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• 2007

컴퓨터 기술이 급속히 발전됨에 따라, 최근에는 많은 분야에서 지리정보시스템(GIS)이 활용되고 있다. 이 연구에서는 서울 내의 한 시범 지역을 대상으로 지하 지반 조건에 따라 영향을 받는 부지 효과에 관련된 지진피해 가능성을 GIS 기법을 이용하여 평가하였다. 시범 지역에서의 지역적 부지고유 지진 응답의 평가를 위하여 서울 대도시 지역에 대한 기존 시추 조사 자료의 분포를 파악하였다. GIS 토대의 지반 정보 시스템(GTIS)을 구축하여 시범 지역 전체에 대한 공간 지층 정보를 예측하였다 서울 시법 지역의 부지고유 지진응답 예측을 위한 부지 주기$(T_G)$의 정밀구역화를 GTIS 내에서 수행하였다. 공간 분포 정밀구역화 지도로부터 시범 지역 내 2 층에서 4 층 건물들의 지진 취약성을 확인하였다. 또한, GTIS 내에서 $T_G$ 분포를 토대로 설계 지반 운동 결정을 위한 지반 분류 지도를 작성하였으며, 그로부터 대상 시범 지역 부지의 거의 대부분이 현행 지반 분류 C 와 D로 분류됨을 확인하였다. 이와 같은 서울 시범 지역에 대한 지진 정밀구역화 적용 구조 체계는 특별히 기존 시추 자료를 활용하여 대도시 서울 지역 전체에 대해 적용 가능할 것으로 판단된다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2006년도 학술발표회 논문집
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• pp.276-283
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• 2006

Korea is considered to be immune from the earthquake hazard because it is located far away from the active fault. However, recent earthquake caused a loss of lives and economical loss worldwide. Hence there has been raised an importance of the earthquake resistant design for various infrastructures. In this research, the seismic design and evaluation criterion for RC bridge pier were proposed from the experimental results of 82 circular RC bridge piers tested in domestic and aboard. New seismic criterion was introduced the limited ductile design provision suitable to Korean peninsula, which would be classified as a low or moderate seismic region. In addition, further important topic for the seismic safety of RC bridge piers in Korea is the seismic performance enhancement of RC bridge piers, which were designed and constructed before the 1992 seismic design provision. Therefore, the proposed seismic performance evaluation criterion could be very useful to judge seismic retrofit need or not according to the residual seismic performance of the RC bridge piers. Also, it could reduce an uncertainty for the safety of the infrastructure under earthquakes.

• 한국지반공학회논문집
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• 제37권12호
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• pp.7-23
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• 2021

전력, 통신, 상수, 난방, 중수 등의 공급망을 구성하는 지하공동구는 도시기능을 유지하기 위한 핵심 기간망이며, 재난 및 재해로 서비스의 정지 및 일시적 중단이 발생하는 경우 대규모 사회경제적 손실을 가져온다. 본 연구에서는 지중구조물에 대한 개선된 내진설계 및 평가를 위하여 국내 지진환경에 부합하는 지진원 스펙트럼으로부터 대상 지반의 증폭 및 감쇠 효과를 반영한 시나리오 지진에 기반한 지반변위 예측 방법을 제시하였다. 코사인법으로 통용되는 기존의 단순화 가정법 및 지반응답해석과의 비교를 통해서 본 연구가 제시하는 재해도에 상응하는 지반변위 산정방법이 합리적이며 공학 실무에서 충분히 적용 가능한 것을 확인하였다.

• Earthquakes and Structures
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• 제15권1호
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• pp.45-65
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• 2018

Over the last three decades, Performance-based Earthquake Engineering (PBEE) has been mainly developed for high seismicity regions. Although information is abundant for PBEE throughout the world, the application of PBEE to lower-seismicity regions, such as those where the magnitude of the maximum considered earthquake (MCE) is less than 6.5, is not always straightforward because some portions of PBEE may not be appropriate for such regions due to geological differences between high- and low-seismicity regions. This paper presents a brief review of state-of-art PBEE methodologies and introduces the seismic hazard of lower-seismicity regions, including those of the Korean Peninsula, with their unique characteristics. With this seismic hazard, representative low-rise RC MRF structures and high-rise RC wall residential structures are evaluated using PBEE. Also, the range of the forces and deformations of the representative building structures under the design earthquake (DE) and the MCE of South Korea are presented. These reviews are used to propose some ideas to improve the practice of state-of-art PBEE in lower-seismicity regions.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 추계 학술발표회 논문집
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• pp.28-34
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• 2002

The b-value in the magnitude-frequency relationship logN(m) = $\alpha$ - bmwhere N(m) is the number of earthquakes exceeding magnitude m, is important seismicity parameter In hazard analysis. Estimation of the b-value for earthquake data observed on KSRS array network is done employing the maximum likelihood technique. Assuming the whole Korea Peninsula as a single seismic source area, the b-value is computed at 0.9. The estimation for KMA earthquake data is also similar to that. Since estimate is a function of minimum magnitude, we can inspect the completeness of earthquake catalog in the fitting process of b-value. KSRS and KMA data lists are probably incomplete for magnitudes less than 2.0 and 3.0, respectively. Examples from probabilistic seismic hazard assessment calculated for a range of b-value show that the small change of b-value has seriously effect on the prediction of ground motion.

• 한국지반신소재학회논문집
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• 제8권1호
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• pp.1-10
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• 2009

지진을 수반한 산사태는 지난 십년동안 수만명의 사상자와 수십억불의 재난피해를 초래해 왔다. 정역학적으로 안정된 경사로 표현되는 잠재적 지진 위험요소를 결정하는 것은 지진이 발생하는 동안 중요한 움직임을 평가하는데 필수적이다. 동적 하중에서의 산사태 움직임을 추정하기 위한 Newmark 방법이 소개되고 두 사례에 적용되었다. 그리고 에너지에 근거한 간략법이 Newmark의 변위를 추정하기 위하여 개발되었다.

• Nuclear Engineering and Technology
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• 제50권8호
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• pp.1372-1386
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• 2018

Despite recent advances in multi-hazard analysis, the complexity and inherent nature of such problems make quantification of the landslide effect in a probabilistic safety assessment (PSA) of NPPs challenging. Therefore, in this paper, a practical approach was presented for performing an earthquake-induced landslide PSA for NPPs subject to seismic hazard. To demonstrate the effectiveness of the proposed approach, it was applied to Korean typical NPP in Korea as a numerical example. The assessment result revealed the quantitative probabilistic effects of peripheral slope failure and subsequent run-out effect on the risk of core damage frequency (CDF) of a NPP during the earthquake event. Parametric studies were conducted to demonstrate how parameters for slope, and physical relation between the slope and NPP, changed the CDF risk of the NPP. Finally, based on these results, the effective strategies were suggested to mitigate the CDF risk to the NPP resulting from the vulnerabilities inherent in adjacent slopes. The proposed approach can be expected to provide an effective framework for performing the earthquake-induced landslide PSA and decision support to increase NPP safety.

• 국제강구조저널
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• 제18권4호
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• pp.1470-1481
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• 2018

Building-level response to post-earthquake fire hazards in steel buildings has been assessed using primarily two-dimensional analyses of the lateral force resisting system. This approach may not adequately consider potential vulnerabilities in the gravity framing system. For this reason, three-dimensional (3D) finite element models of a 10-story case study building with perimeter moment resisting frames were developed to analyze post-earthquake fire events and better understand building response. Earthquakes are simulated using ground motion time histories, while Eurocode parametric time-temperature curves are used to represent compartment fires. Incremental dynamic analysis and incremental fire analysis procedures capture a range of hazard intensities. Findings show that the structural response due to earthquake and fire hazards are somewhat decoupled from one another. Regardless of the level of plastic hinging present in the moment framing system due to a seismic event, gravity column failure is the initiating failure mode in a fire event.