• Land and Housing Review
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• v.13 no.3
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• pp.83-102
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• 2022

After the earthquake in South Korea (Gyeongju and Pohang), interest in securing the seismic performance of piloti buildings was increasing. In this paper, a study was conducted to propose a seismic retrofit method for piloti building of LH. The proposed seismic retrofit method considers the priority of seismic retrofit and the type of core. To verify the effectiveness of the proposed seismic retrofit method, computational analysis was performed according to the type of core. As a result, it was confirmed that the seismic performance was improved when the proposed seismic retrofit method was used.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11b
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• pp.683-689
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• 1996

본 논문의 목적은 현재 국내에서 개념설계중인 KALIMER(Korea Advanced LIquid MEtal Reactor) 원자로구조물에 대한 면진성능과 내진여유도를 평가하여 이들 성능을 향상시킬 수 있는 주요 설계변경 부위를 검토하는 것이다. 이를 위하여 ANSYS 범용 유한요소해석코드를 이용하여 원자로구조물에 대한 3차원 유한요소해석모델을 작성하고 이로부터 집중질량 스프링으로 이루어진 지진해석모델을 개발하여 지진해석을 수행하였다. KALIMER 원자로 구조물에 대한 내진평가결과 내진능력(Seismic Capability)은 0.35g로 나타났으며 이는 Reactor Vessel Liner, Separation Plate그리고 Support Barrel의 연결부위의 수직 강성을 증가시키는 설계변경을 통하여 크게 향상될 수 있는 것으로 나타났다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.150-153
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• 2010

본 논문에서는 비내진 설계된 철근콘크리트 골조로 이루어진 저층의 노후공동주택의 내진성능을 향상시키기 위한 구조물의 보강방법에 대해 연구하였다. 이를 위하여 비선형 정적 해석과 시간 이력 해석을 수행하여 추가되는 철골 모멘트골조와 가새의 내진보강 효과를 검증하였다. 해석결과에 따르면 $H150{\times}150{\times}6{\times}8$로 구성된 철골 모멘트골조는 탄성구간에서는 하중의 약 1%, 구조물이 항복한 이후, 최대 3.5%까지 하중을 부담하여 자체적으로 지진하중에 대한 저항 성능은 크지 않았다. 그러나 철골 모멘트골조와 가새를 동시에 사용함으로써 접합부의 조기 파괴를 방지하고 구조물의 내진성능을 큰 폭으로 증진시킬 수 있는 것으로 나타났다.

• Journal of the Korean Institute of Educational Facilities
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• v.19 no.2
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• pp.30-35
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• 2012

• Proceedings of the Korean Nuclear Society Conference
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• 2003.10a
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• pp.477.2-477.2
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• 2003

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.474-477
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• 2011

본 논문에서는 내진보강공법의 내진성능향상을 평가하기 위하여 진동대실험을 실시하였다. 실험 구조체는 비보강, 보강 구조체로 각각 실규모 크기의 구조체를 2개 제작하였다. 기둥 상, 중, 하부 및 보에 각각 Strain게이지, 가속도계를 설치한 후 설계펙트럼가속도 0.15g의 30~150%까지 가속도를 증가 시키면서 실험을 수행하였다. 그 결과 비 보강 구조체는 0.2g에서 최대 80cm균열이 발생하였으나 보강 구조체는 균열이 발생하지 않았다. Strain의 변화량에서는 비 보강이 보강보다 최대 1700%크게 나타났다. 가속도의 변화량은 비 보강이 176%크게 나타났다. 진동대 실험결과 본 내진보강공법이 내진성능향상에 지대한 영향을 주고 있음이 증명되었다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.21 no.2
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• pp.127-133
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• 2008

The purpose of this study is to investigate the seismic performance of both exterior precast concrete cladding panels and their connections on steel frame, when these cladding systems are considered as the structural components. The degrees of their participation of lateral stiffness to the main building are evaluated in terms of different heights of the cladding panels. Considering the cladding system as an integrated building provides additional lateral stiffness, as well as a mechanism for energy dissipation and this system can be used as one of an advanced passive seismic control system. Hysteresis behaviors of connectors are modeled and integrated into a nonlinear finite element analysis program, ABAQUS. The results show that connections play the most important role in structural cladding system and they improve seismic performance of overall building response.

• Journal of Korean Society of Steel Construction
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• v.16 no.2 s.69
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• pp.247-255
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• 2004

An experimental program was undertaken to develop seismic retrofit methods of existing steel moment connections with floor slab for improved seismic performance. Five full-scale composite specimens were tested under cyclic loading. Conventional through-diaphragm connections [please check this; no search results were found for through-diaphragm connections] composed of square-tube column and H-beam were retrofitted by adding either a bottom-flange dogbone (RBS) or an improved welded horizontal stiffener at the beam bottom flange. The effectiveness of the proposed retrofit connections schemes was evaluated. The specimen retrofitted using the RBS concept at the bottom flange showed poor connection ductility. In contrast. specimens with the proposed horizontal stiffener details exhibited improved connection ductility.

• Journal of the Korean Society of Hazard Mitigation
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• v.4 no.1 s.12
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• pp.1-14
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• 2004

The objective of this study is firstly to frame up the seismic safety of concrete gravity dams. It is necessary to analyze seismic response and evaluate seismic performance of concrete gravity dams during earthquake. In this study, seismic damage and dynamic analysis of concrete gravity dams using structural analysis package such as SAP2000 and MIDAS were performed. Additional dynamic water pressure due to earthquake considered as additional mass for numerical seismic analysis. According detailed analysis, the vibration through the dam structure (transverse to water flow) seems to be very critical depending on the shape of the dam. For more precise evaluation of seismic fragility of concrete gravity dams, further research is still needed.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.34 no.6
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• pp.437-443
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• 2021

In this study, the use of a steel yielding damper is considered as an appropriate method to enhance the behavior of CBFs and a steel damper which is economical and straightforward to construct and replace after a severe earthquake is developed. The proposed damper was investigated experimentally and numerically. In addition, a parametric study was performed to evaluate the effect of the three types of damper mechanisms (shear, shear-flexural, and flexural) on the behavior of the proposed damper. The experimental results, as well as the numerical results, indicate that the shear damper exhibits better performance than the other dampers in terms of strength and stiffness.