• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2008년도 정기 학술대회
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• pp.235-240
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• 2008

PSC box girder bridges are built through the repetitive manufacturing process of concrete segment. However, during the initial segment manufacturing stage, design change may occur frequently due to design errors and interferences between components, resulting in the extension of segment manufacturing period. This paper aims to verify the manufacturing process of PSC box girder segment by 3D simulation technique. All the components of a segment were modelled and assembled by simulation technique and then, some design errors were found and revised appropriately to optimize the manufacturing process of segment. Consequently, 3D simulation technique would be promising to improve the quality of the segment and to reduce its manufacturing time and cost.

• 한국구조물진단유지관리공학회 논문집
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• 제5권2호
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• pp.103-109
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• 2001

In this paper, the prestressing order of tendons is studied to minimize a bursting force of an anchorage. The bursting forces is a primary factor of anchorage failures. The forces of the anchorage depend on the prestressing order and size of the tendons, if a lot of tendons are introduced to the anchorage. Many studies have been made to analyze the bursting force of the anchorage. However, the studies have been limited to the bursting forces of the anchorage having one or two tendons. PSC box girder bridges usually have a lot of tendons. And the difference of the bursting forces lies in the prestressing order of the tendons. As a result of the lack of studies on the prestressing order for the bridges, the order depends on the designer's intuition and experiences. It may be stated that this study should be useful for determining the reasonable prestressing order of tendons for the PSC box girder bridges.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.864-869
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• 2008

Magnetic Levitated(Maglev) Vehicle, which utilizes electromagnetic forces between dual-pole electromagnets and a steel rail, generally runs on guideway structures. A prototype of an Urban Maglev Vehicle has been developed and tested in Korea, This study was conducted as a cooperation research subject of the 3-1 subject, performance improvement of maglev track structures, of the Center for Urban Maglev Program, statred in 2006. As the Maglev load is distributed rather than concentrated, a field test was conducted on Simple Span PSC-BOX Girder Bridge(L=25.0m) of the Expo-Maglev test track in Daejeon to examine the dynamic effect of the Maglev load on the bridge. Numerical analyses were also performed up to the maximum passing speed of 110 km/h by 10 km/h increments of Maglev Vehicle using Finite Element model of bridge, and girder deflections, accelerations and Dynamic Amplification Factor (DAF) are analysed.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.205-210
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• 2000

An optimum design algorithm of PSC box girder bridges using design sensitivity analysis is proposed in this paper. For the efficiency of the proposed algorithm, approximated reanalysis techniques using design sensitivity analysis are introduced. And also to save the numerical efforts, an efficient reanalysis technique through approximated structural responses is proposed. A design sensitivity analysis of structural response is executed by automatic differentiation(AD). The efficiency and robustness of the proposed algorithm, compared with conventional algorithm, is successfully demonstrated in the numerical example.

• 한국구조물진단유지관리공학회 논문집
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• 제13권1호통권53호
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• pp.179-185
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• 2009

최근 건설구조물에 대한 FRP의 활용에 관한 연구가 활발히 진행되고 있다. FRP는 단위중량당의 강도와 강성이 기존 건설재료인 강재나 콘크리트에 비해 매우 크고, 부식에 대한 저항성이 뛰어나는 등의 여러 가지 물리적, 화학적 장점이 있다. 이러한 장점을 이용하여 FRP 외양관을 단면의 효율성을 극대화할 수 있고 경제성과 경관에 매우 효과가 큰 스트럿을 가진 PSC 박스거더교의 스트럿 부재의 피복재로 적용하고자 한다. 본 논문에서는 스트럿을 가진 PSC 박스거더에 사용되는 FRP 외양관의 적용성을 평가하기 위하여 이와 관련한 FRP 외양관의 시편실험과 FRP로 피복된 콘크리트 부재의 압축실험을 수행하였으며, 실험결과로부터 콘크리트 강도와 에너지 흡수능력 및 연성이 증진되어 스트럿 부재로써 충분한 안전성을 확보할 수 있음을 확인하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표대회 논문집(III)
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• pp.694-700
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• 1998

PSC box bridge by MSS construction method may not be set at cross section at one step. Web and bottom flange(U member) would be set at first, top flange will be set later with a time lag. In this case, U member and top flange concrete have different strain history. As two different aged section behaves as the composite section, there would happen the redistribution of stress. This is come from time-dependent strain characteristics of concrete itself. In this study, two models are considered, one with considering the set time of cross section and the other without. By performing longitudinal analysis of two models on considering construction stage, the stress differences of two are compared. As the analysis results show a considerable differences in the stresses of cross section between two models, the set time of cross section is needed for rational design f PSC box girder bridge.

• 문화기술의 융합
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• 제9권4호
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• pp.549-555
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• 2023

공용중인 고속철도의 PSC Box 교량의 긴장력 관리는 교량 성능에 있어 매우 중요한 기능으로 교량 유지관리시 세밀한 관리가 필요하다. 이에 본 연구에서는 열차(활하중) 재하시험 없이 측정한 상시처짐 결과를 이용하여 PSC Box girder 내부의 긴장력 감소 수준과 긴장력 손실에 다른 재긴장 예측 시기를 연구하고자 한다. PSC Box 거더의 긴장력 감소에 따른 재긴장 시기 예측결과, 준공 이후 약 17년 이전에서는 긴장력 감소(Jacking force loss) 곡선이 완만한 것으로 나나낫다. 그러나 17년 이후에서는 긴장력 감소 곡선이 급격하게 변화되는 것으로 나타났다. 따라서 공용연수 증가에 따라 긴장력이 감소하는 것으로 확인되었고, 구조물의 노후화가 진행될수록 긴장재의 손신을 더 급격하게 증가되는 것으로 분석되었다. 향후 공용중인 PSC Box 교량중에서 준공 이후 18년 이상 경과된 구조물의 경우 긴장재 및 주변 손상에 대한 정밀조사가 필요할 것으로 판단된다.

• 한국구조물진단유지관리공학회 논문집
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• 제10권5호
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• pp.97-105
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• 2006

일반적으로 PSC 교량은 여러개의 강선을 포함하며, 이러한 강선들의 긴장순서에 따라 정착부의 파열력의 크기는 좌우된다. 그럼에도 불구하고 강선긴장순서에 대한 연구부족으로 강선긴장시 긴장순서를 설계자의 경험이나 직관에 의하여 결정하고 있다. 본 연구에서는 정착부의 파열력을 산정하는 여러 방법에 대하여 고찰한 후, 가장 합리적인 해석방법을 선택하여 PSC 교량중에서 가장 대표적인 PSC빔교와 PSC박스거더교에 대하여 해석을 통한 합리적인 긴장순서를 결정하였다. 본 연구에서 제시한 방법은 PSC교량 정착부의 파열력을 최소화하는 강선긴장순서 결정에 유용한 방법이 될 것이다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.591-594
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• 2003

It is reported that the amount of reinforcements for domestic PSC box girder bridges is used two times more that those for foreign PSC box girder bridges, which is considered to be irrational and uneconomical. Therefore, we have come to the conclusion through this study that the advanced design direction can reduce the amount of reinforcements under the condition that the static load test and the nonlinear analysis for the specimen of the PSC box girder bridge with reduced reinforcements which is designed by advanced design direction was carried out in order to verify the validity of the advanced design direction.

• 콘크리트학회논문집
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• 제11권3호
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• pp.23-34
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• 1999

In designing PSC box girder bridge, the dead load, prestressing force, creep and shrinkage of concrete are the main factors which influence the camber and deflection of segmental concrete structure under construction. Among these factors the creep and shrinkage are the functions of the time-dependent property which, therefore, must considered with time. The prediction model for estimating creep and shrinkage of concrete has been suggested by ACI, CEB/FIP, JSCE and KSCE design code. In this study the creep and shrinkage test were carried out for four curing ages of concrete which was applied to the pretressed concrete box-girder bridge at a construction site, and the results of test were compared to the values of prediction by the design code. Shrinkage test shows that the test results are similar to KSCE-96 and JSCE-96 but very higher than other prediction model and creep test results are generally similar to ACI-209 and DSCE-96 but lower than other prediction models in contrast to shrinkage test.