• Journal of the Earthquake Engineering Society of Korea
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• v.14 no.1
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• pp.51-62
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• 2010

The purpose of this study was to investigate the performance of hollow precast segmental PSC bridge columns. The proposed system can reduce work at a construction site and makes construction periods shorter. Shortened construction times, in turn, lead to important safety and economic advantages when traffic disruption or rerouting is necessary. Two hollow precast segmental PSC bridge columns were tested under a constant axial load and a quasistatic, cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures, was used. The proposed numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.04a
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• pp.4-5
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• 2013

프리스트레스트된 프리캐스트 콘크리트 부재는 장경간이 가능하고 공장생산으로 품질관리가 용이하다. 그러나 프리스트레싱 텐던이 화재에 노출되는 경우 일반 철근에 비해 급격하게 강도를 상실해 구조물의 붕괴로 이어질 수 있다. 국내의 경우 실험에 기초한 내화성능에 대한 연구는 활발히 이루어지고 있으나 그에 반해 성능기반 설계법이 활성화 될 때 요구되는 수치해석적인 연구는 많이 부족한 실정이다. 따라서 본 연구에서는 문헌조사를 통해 이전에 수행된 실험 데이터를 통해 현재 외국에서 활발히 사용되는 수치해석 프로그램을 검증하고 수치해석 모델링을 통해 각각의 내화시간에 따른 적절한 피복 두께를 제안하였다.

• Magazine of the Korea Concrete Institute
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• v.6 no.5
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• pp.171-182
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• 1994

Recently, several prestressed concrete box girder bridges have experienced severe cracking along the tendon path when prestress force has been transferred to the anchorage zone. The purpose of the present study is therefore to explore characteristics of the local stress distribution, to study the effects of section geometry of anchorage zones, i.e., tendon inclination, tendon eccentricity and concrett. cover thickness anti to develop recornrncnd;itions for specific design criteria for post~tensioned a:lchorage zones. 7'0 accomplish these objectives, a cc~mprehen sive nonlinar finite element study has been conducted. From this study, realistic forrnulas for crackinq and ultimate load capacities are proposed. 'These equations reasonably well predict the crackinq and ultimate loads of prestressed concrete anchorage zones.

• Magazine of the Korea Concrete Institute
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• v.16 no.5 s.82
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• pp.10-15
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• 2004

• Magazine of the Korea Concrete Institute
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• v.16 no.5 s.82
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• pp.16-19
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• 2004

• Magazine of the Korea Concrete Institute
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• v.24 no.2
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• pp.32-36
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• 2012

• Magazine of the Korea Concrete Institute
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• v.23 no.3
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• pp.53-55
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• 2011

• Magazine of the Korea Concrete Institute
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• v.13 no.3
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• pp.122-130
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• 2001

• Magazine of the Korea Concrete Institute
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• v.19 no.3
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• pp.80-90
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• 2007

• Journal of the Korea Concrete Institute
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• v.23 no.3
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• pp.281-287
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• 2011

Recently, bridge construction technology has made great progress from development of high performance materials and new bridge types. However, most technology are based on methods of cast-in-place and material cost saving. The method of cast-in-place concrete causes environmental damages and costumer complaints. Especially, under bad weather conditions, the construction can not proceed. To overcome these disadvantages, new construction methods were developed to reduce construction time. These methods are called precast method. Most prefabricated methods have been applied to superstructure constructions of bridges, but very minutely applied to substructure constructions. The most important agendas on precast method are light weight and transportability of the precasted members, because very strict transporting specifications exist for road transportation of the precasted members. For example, the weight and length of coping members may be larger than the available transporting vehicles. Although column is constructed by precast method to save construction time, if coping member is constructed by cast-in-place method, then the column construction time reduction becomes meaningless. Therefore, in this study, a new precast coping member and a connecting system of column-coping member are proposed. The proposed method is verified by analyzing their ultimate performance through analysis and experimental study.