• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 춘계 학술발표회 논문집
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• pp.109-116
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• 2002

Since experimental evaluation of underground RC structures considering interaction with surrounding soil medium is quite difficult to be simulated, the evaluation for the underground RC structures using an analytical method can be applied very usefully. For underground structures interacted with surrounding soils, it is important to consider path-dependent RC constitutive model, soil constitutive model, and interface model between structure and soil, simultaneously. In this paper, an elastoplastic interface model which consider thickness of interface is proposed and applied for the analysis considering the interaction. Failure mechanism of underground RC box of two story and two box subway station under seismic action is obtained and the effects of ductility of intermediate column to entire underground RC system are investigated through analysis.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.259-260
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• 2012

As RC structures in the marine environment rapidly increase, the interest and the importance of Chloride Penetration durable design have been growing. However, there is hardly any domestic Chloride Penetration durability of RC structures designed analysis programs. Currently, Chloride Penetration durable design method is studied and launched actively as a program in the United States, Europe, Japan and etc., but it is limited to Chloride Penetration durability of RC structures excluded from maintenance construction. Also, the level of dependence on the foreign technology is high; the foreign program is imported and used when needed. The main objective is to compare and to evaluate with the durability assessment program and several conditions when considering the design of Chloride Penetration durability through the programs developed abroad.

• 전산구조공학
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• 제2권1호
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• pp.79-86
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• 1989

본 논문은 단순하고 효율적인 철근콘크리트(RC) 부재의 최적설계 방법에 관한 내용이다. 일정 폭 및 깊이의 RC 단면을 구성한 후 단면 저항치가 증가하는 순으로 재배열하여 단면 데이타 베이스를 구성한다. 구성된 단면 데이타베이스 내의 단면번호와 단면 저항치 사이의 관계식을 회귀분석을 통해 구한 수 이 관계식으로부터 연속해를 결정한다. 결정된 연속해 부근에 불연속해가 존재한다는 가정하에 직접탐색을 통해 불연속 최적해를 결정한다.

• 한국공간구조학회논문집
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• 제22권2호
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• pp.29-37
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• 2022

The collapse of reinforced concrete (RC) frame buildings is mainly caused by the failure of columns. To prevent brittle failure of RC column, numerous studies have been conducted on the seismic performance of strengthened RC columns. Concrete jacketing method, which is one of the retrofitting method of RC members, can enhance strength and stiffness of original RC column with enlarged section and provide uniformly distributed lateral load capacity throughout the structure. The experimental studies have been conducted by many researchers to analyze seismic performance of seismic strengthened RC column. However, structures which have plan and vertical irregularities shows torsional behavior, and therefore it causes large deformation on RC column when subjected to seismic load. Thus, test results from concentric cyclic loading can be overestimated comparing to eccentric cyclic test results, In this paper, two kinds of eccentric loading pattern was suggested to analyze structural performance of RC columns, which are strengthened by concrete jacketing method with new details in jacketed section. Based on the results, it is concluded that specimens strengthened with new concrete jacketing method increased 830% of maximum load, 150% of maximum displacement and changed the failure modes of non-strengthened RC columns.

• 화약ㆍ발파
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• 제29권2호
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• pp.1-12
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• 2011

외부폭발, 화재, 충돌, 지진, 태풍과 같은 비정상 하중에 의한 고층빌딩의 연쇄붕괴(progressive collapse) 해석에 관련된 많은 연구가 진행되고 있다. 특히 그러나 실규모의 고층건물을 대상으로 한 손상 및 붕괴에 실험은 현실상 불가능한 실정이다. 본 연구에서는 구조물 발파해체분야에서 적용되는 ELS 소프트웨어를 이용하여 외부폭발에 의한 고층 RC 구조물의 국부손상 및 연쇄붕괴시뮬레이션을 수행하였다. 현관으로부터 1m, 2m, 5m, 10m, 15m 이격되어 폭약 1,500kg이 폭발한 것을 가정하여, 이격거리에 따른 국부손상과 이에 따른 연쇄붕괴현상을 파악하였다. 특히 기폭시나리오에 따라 구조물 지지부재의 일부를 제거하여 구조물의 붕괴를 유도하는 발파해체기법을 국부손상-연쇄붕괴 전이과정 연구에 적용하였다.

• Earthquakes and Structures
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• 제17권2호
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• pp.221-232
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• 2019

Material non-linearity of Reinforced Concrete (RC) framed structures is studied by modelling concrete using the Concrete Damage Plasticity (CDP) theory. The stress-strain data of concrete in compression is modelled using the Hsu model. The structures are analyzed using a finite element approach by modelling them in ABAQUS / CAE. Single bay single storey RC frames, designed according to Indian Standard (IS):456:2000 and IS:13920:2016 are considered for assessing their maximum load carrying capacity and failure behavior under the influence of gravity loads and lateral loads. It is found that the CDP model is effective in predicting the failure behaviors of RC frame structures. Under the influence of the lateral load, the structure designed according to IS:13920 had a higher load carrying capacity when compared with the structure designed according to IS:456. Ultra High Performance Fiber Reinforced Concrete (UHPFRC) strip is used for strengthening the columns and beam column joints of the RC frame individually against lateral loads. 10mm and 20mm thick strips are adopted for the numerical simulation of RC column and beam-column joint. Results obtained from the study indicated that UHPFRC with two different thickness strips acts as a very good strengthening material in increasing the load carrying capacity of columns and beam-column joint by more than 5%. UHPFRC also improved the performance of the RC frames against lateral loads with an increase of more than 3.5% with the two different strips adopted. 20 mm thick strip is found to be an ideal size to enhance the load carrying capacity of the columns and beam-column joints. Among the strengthening locations adopted in the study, column strengthening is found to be more efficient when compared with the beam column joint strengthening.

• 한국구조물진단유지관리공학회 논문집
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• 제28권1호
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• pp.90-97
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• 2024

이 연구에서는 3D 프린팅용 HDCC를 활용하여 패류 껍질의 적층형 결합구조를 모사한 1방향 슬래브의 휨 성능을 평가하였다. 휨 성능 평가를 위하여 일반 콘크리트(RC) 및 HDCC로 일체 제작된 슬래브(HDCC)와 HDCC로 제작된 슬래브 내부에 PE-mesh를 삽입하여 층상형 구조를 모방한 슬래브(HDCC-M)를 제작하여 4점 재하 휨 실험을 수행하였다. 실험결과 HDCC-M 슬래브 실험체의 내력은 RC 및 HDCC 슬래브 실험체 대비 각각 1.7배 및 1.2배 높은 결과를 나타내었다. 또한, 항복 변위와 최대처짐량의 비율로 변위 연성비를 평가한 결과, HDCC 슬래브 실험체가 가장 우수한 값을 나타내었다. 이는 삽입된 PE-mesh로 인해 층을 분리하여 연성을 증가시키는 동시 mesh 체눈을 관통하는 각주형 HDCC가 로 내력손실을 방지하였기 때문이라고 판단된다.

• 화약ㆍ발파
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• 제27권2호
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• pp.19-25
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• 2009

벽식구조 아파트에 대한 재개발의 수요가 증가함에 따라 RC구조 아파트와는 다른 새로운 해체기술이 요구되고 있다. 본 연구에서는 벽식구조 아파트의 발파해체를 위한 기초적인 자료를 제공하기 위해 실시설계 도면을 토대로 벽식구조 아파트를 주동 형태 및 규모에 따라 분류하고, 아파트의 높이(H), 폭(B), 길이(L)의 발파 패턴 요소를 이용하여 벽식구조 아파트의 발파해체에 적합한 발파해체공법을 분석하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.7-8
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• 2017

As the importance of maintenance of reinforced concrete structure recently has emerged, the attention of durability of structure has been increasing. There are many studies about durability decline especially due to the carbonation. In order to study carbonation progress after surface repair of carbonated concrete, each carbonation penetration velocity from different repair materials of concrete structure is compared through the experiment of carbonation accelerating CO₂ concentration to 5%. As carbonation infiltration progress is predicted through this study, the counterplan of service life evaluation will be prepared on selection of repair materials of concrete structure.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.599-604
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• 2000

The analytical studies for the test results are presented. From experimental envelope curve, hysteretic behaviors under cyclic loading are modelled for beam-column subassemblages. Modelled curves show relatively good reproduction or experimental curves. finally, seismic performances are investigated for 7 story plain framed structure by nonlinear dynamic analysis. The resulting responses are different by each beam-column joint design.