• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.65-68
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• 2009

Recently, as architectural concrete structures become high-rise and megastructured, concrete become high-strengthened and, by ensuring products of more stability, and rationalization of construction are required.large cross-sectional precast concrete members such as columns show large temperature increase in manufacturing process not only by external heating but also by concrete itself's hydration heating. Therefore, it is expected that specimen for management to predict strength and compression strength of precast concrete member shows different strength characteristics. Concerning this, in order to suggest strength characteristics of high strength mass concrete suitable for precast concrete application, this study comprises the inclusive investigations on the relations between core strength and the strength characteristics per member cross-section dimensional value and per water-bonding material ratio value.

• 한국구조물진단유지관리공학회 논문집
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• 제24권5호
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• pp.53-60
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• 2020

본 연구에서는 현장 타설 콘크리트 공법과 같이 연속성을 가질 수 있는 스마트 프리캐스트 일체화 기술을 철도 정거장 토목/건축 구조물 적용성에 구조물의 실제 현장에서 이루어지는 방법과 동일하게 설치 후 철도 기준에 준하는 설계 후 정적/동적 거동 해석을 통해서 최적단면을 도출하며, 기존 동적 센서와 3축 가속도측정 센서를 부착하여 프리캐스트 구조물의 손상 정도에 따른 mode 해석을 비교하여, 프리캐스트 구조물의 안정성에 대한 데이터와 철도 연변에서의 불확실성에 대한 개선과 향후 프리캐스트 구조물의 교체 시기, 손상 위치 등에 대한 기초자료로 활용하기 위함이다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 추계 학술논문 발표대회
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• pp.49-52
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• 2007

Recently, as architectural concrete structures become high-rise and megastructured, concrete become high-strengthened and, by ensuring products of more stability, air compression and rationalization of construction are required. In general, product management test of precast concrete member, specimen for management cured in the same condition with precast concrete member is substitutively used for strength test. However, large cross-sectional precast concrete members such as columns show large temperature increase in manufacturing process not only by external heating but also by concrete itself's hydration heating. Therefore, it is expected that specimen for management to predict strength and compression strength of precast concrete member shows different temperature history and strength characteristics. Concerning this, in order to suggest temperature history and strength characteristics of high strength mass concrete suitable for precast concrete application, this study comprises the inclusive investigations on the relations between management specimen with similar temperature history and core strength, and the strength characteristics per member cross-section dimensional value and per water-bonding material ratio value.

• Computers and Concrete
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• 제13권4호
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• pp.501-516
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• 2014

The purpose of this study was to investigate the performance of precast concrete pier cap system. The proposed precast pier cap provides an alternative to current cast-in-place systems, particularly for projects in which a reduced construction time is desired. Five large-scale pier cap specimens were constructed and tested under quasistatic monotonic loading. The computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) was used for the analysis of reinforced concrete structures. A bonded tendon element is used based on the finite element method, and can represent the interaction between the tendon and concrete of a prestressed concrete member. A joint element is used in order to predict the inelastic behaviors of segmental joints with a shear key. This study documents the testing of the precast concrete pier cap system under monotonic loading and presents conclusions and design recommendations based on the experimental and analytical findings. Additional full-scale experimental research is needed to refine and confirm design details, especially for actual detailing employed in the field.

• 한국공간구조학회지
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• 제20권3호
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• pp.4-8
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• 2020

• 복합신소재구조학회 논문집
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• 제6권3호
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• pp.14-19
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• 2015

In this study we developed an integrated precast concrete decks for a rapid construction. The structural performance in the integrated precast bridge decks is evaluated by real-scale test bed and detailed finite element analyses. The numerical analysis results were compared with the experimental data from a real-scaled single-span precast/prestressed concrete bridge decks under truck loading. Parametric studies are focused on the various effects of external loads on the structural behavior for different locations and measuring points on the precast bridge decks. The assessment in this study indicates that the integrated precast bridge decks show an excellent structural performance as expected.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1989년도 가을 학술발표회 논문집
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• pp.59-62
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• 1989

Construction of high-rise precast concrete apartment is an atractive alternative solution for severe shortage of residential facilities, especially in metropolitan areas in Korea. New building regulations enforced since 1988 requires all buildings higher than 6 storeys to be designed for earthquake. However, we hardly have any experience on seismic design of precast concrete buildings. This paper deals with methodology of seismic design and design considerations of connections for the large panel structures. Also addressed in this paper are studies needed to develop proper seismic design procedures of precast concrete buildings.

• 한국건축시공학회지
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• 제5권1호
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• pp.89-96
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• 2005

The increase of hish-rise residential-commercial buildings is required to cut down a term of works and the cost of construction. Reinforced concrete structures and steel framed reinforcement concrete that are commonly used have the difficulty in reducing them. Therefore, the purpose of this study is to propose a new precast concrete complex system and to analyze its economical feasibility. The economic analysis is performed through comparing the cost of a high-rise reinforced building that was already constructed with that of the new proposed precast concrete system, which is limited to structural frame work of typical floors. This study shows that the proposed precast concrete complex system is economical. Further research should be directed at including the influence of a term of works.

• 한국건설순환자원학회논문집
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• 제2권1호
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• pp.93-102
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• 2006

본 연구에서는 순환골재 콘크리트를 구조용으로 활용하기 위한 목적의 일환으로, 품질관리가 용이한 공장제품의 하나인 프리캐스트 콘크리트 박스구조에 순환골재 콘크리트를 적용할 수 있는가를 평가하였다. 이를 위하여 순환 굵은골재만을 0, 30% 치환한 실물크기의 프리캐스트 콘크리트 박스를 각각 제작하여, 외압강도시험, 전단 파괴시험 및 수밀성 시험을 수행하였다. 시험결과 순환골재 콘크리트의 압축강도는 보통 콘크리트의 96% 이상을 확보한 것으로 나타났으며, 외압강도 및 전단 파괴시험 결과에서도 보통 콘크리트를 사용한 박스와 비교하여 약 95% 이상의 성능을 발휘하는 것으로 평가되었다. 특히 수밀성 시험에서는 누수기준수압인 60kPa을 만족하는 한편 보통 콘크리트보다 수밀성이 우수한 것으로 평가되었다. 이러한 시험결과에 근거하여 순환 굵은골재를 30%로 치환하여 프리캐스트 콘크리트 박스 구조에 순환골재 콘크리트를 적용하는 것은 무리가 없을 것으로 판단된다. 또한, 시험결과 예측 및 구조거동 예측을 위하여 3차원 비선형 유한요소해석을 실시하였으며, 유한요소해석결과와 시험결과를 비교한 결과, 순환골재 콘크리트의 치환여부에 관계없이 모든 경우에서 해석결과보다 우수한 구조성능을 확보한 것으로 시험분석되었다. 이러한 비교분석을 통하여 해석과 시험결과에 대한 타당성을 입증하였으며, 특히 적절한 배합을 적용한 순환골재 콘크리트 구조의 경우 일반적인 콘크리트의 해석 기법을 적용하여 신뢰성 있는 거동예측이 가능하다는 것을 추가로 확인하였다.

• Structural Engineering and Mechanics
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• 제82권1호
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• pp.55-67
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• 2022

The precast reinforced concrete frame system is a method for industrialization of construction. However, the seismic performance factor of this structural system is not explicitly clarified in some existing building codes. In this paper, the seismic performance factor for the existing precast concrete building frame systems with cast-in-situ reinforced shear walls were evaluated. Nonlinear behavior of the precast beam-column joints and cast-in-situ reinforced shear walls were considered in the modeling of the structures. The ATC-19's coefficient method was used for calculating the seismic performance factor and the FEMA P-695's approach was adopted for evaluating the accuracy of the computed seismic performance factor. The results showed that the over-strength factor varies from 2 to 2.63 and the seismic performance factor (R factor) varies from 5.1 to 8.95 concerning the height of the structure. Also, it was proved that all of the examined buildings have adequate safety against the collapse at the MCE level of earthquake, so the validity of R factors was confirmed. The obtained incremental dynamic analysis (IDA) results indicated that the minimum adjusted collapse margin ratio (ACMR) of the precast buildings representing the seismic vulnerability of the structures approximately equaled to 2.7, and pass the requirements of FEMA P-695.