• Title/Summary/Keyword: PSC box-girder bridge

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Verification of Manufacturing Process of PSC Box Girder Bridge Segment by 3D Simulation (3차원 시뮬레이션을 활용한 PSC 박스거더교 세그먼트 제작 공정의 검증)

  • Kim, Min-Seok;Son, Heung-Rak;Lee, Kwang-Myong;Park, Young-Ha;Park, Min-Seok
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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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.

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Minimization of Bursting Force at Anchorage Zone Using Prestressing Order for PSC Box Girder Bridge (PSC 박스거더교 정착부의 최소파열력에 대한 강선긴장순서)

  • Chung, Jee-Seung;Koo, Hyoung-Seon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.2
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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.

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Dynamic Behavior of Simple Span PSC-BOX Girder Bridge under the Passage of the Urban Maglev Transit (도시형자기부상열차 주행하중에 의한 단경간 PSC-Box 거더교의 동적 거동)

  • Yang, Tae-Sock;Chung, Won-Yong;Lee, Gi-Yeol
    • Proceedings of the KSR Conference
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    • 2008.11b
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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.

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Optimization for PSC Box Girder Bridges Using Design Sensitivity Analysis (설계 민감도 해석을 이용한 PSC 박스거더교의 최적설계)

  • 조선규;조효남;민대홍;이광민;김환기
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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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.

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An Experimental Study on the Application of FRP Tube to the Struts of PSC Box Girder Bridge (스트럿을 가진 PSC 박스거더교의 FRP 외양관 적용성 평가를 위한 실험연구)

  • Song, Jae-Joon;Hwang, Yoon-Koog;Lee, Young-Ho;Lee, Seung-Hye
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.13 no.1 s.53
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    • pp.179-185
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    • 2009
  • In recent, the investigations related to the FRP(Fiber Reinforced Polymers) have been increased due to their superior material and mechanical properties such as environmental resistance, high specific strength and stiffness. Considering these advantages, the FRP tube may be proper for strut on the PSC box girder bridge that can maximize the efficiency of cross section and are effective on economics and aesthetics of bridges. In this research, the specimen tests of the FRP tube and compression tests of the concrete member enclosed with the FRP were performed in order to evaluate the suitability of the FRP tubes, which are applied to the PSC box girder bridge with strut. The specific strength of concrete and the energy absorbing capacity as well as ductility were increased according to the experimental results, and it was found that FRP tubes have sufficient safety as strut member.

A Study on the Analysis of PSC Box Girder Bridge Considering Construction Stage in Box Section (시공단계를 고려한 콘크리트-콘크리트 합성형 PSC 박스거더 교량의 해석)

  • 김영진;김병석;강재윤
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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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.

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Prediction of Jacking Force Loss for Serviced High Speed Railway PSC BOX Bridge Using Constant Deflection (상시처짐을 이용한 공용중인 고속철도 PSC BOX교의 긴장력 손실 예측)

  • Jung-Youl Choi;Tae-Keun Kim;Jee-Seung Chung
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.4
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    • pp.549-555
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    • 2023
  • Jacking force loss management inside the PSC Box girder of a common high-speed railway is a very important feature in girder performance, and requires detailed management during the maintenance of the girder. This study aimed to analyze the timing of re-tension prediction of PSC Box girder based on the reduction level of the packing force inside the girder and the results of the tension loss measured without the train load test. As a result of predicting the timing of re-tension according to the level of tension reduction of the PSC Box Girder, the Jacking Force Loss curve was gently analyzed before the structure reached 17 years after confirmed completion, and 17 years later, it was found that the jacking force loss curve progressed rapidly. The results confirmed that the tension of the structure decreases with the service life increase, but considerably decreases as the structure ages. Therefore, more data and research on tension loss of facilities over 20 years are much required.

Numerical Analysis at Anchorage Zone Using Prestressing Order for PSC Bridges (PSC 교량 정착부의 강선긴장순서에 대한 수치해석 연구)

  • Jo, Byung-Wan;Tea, Gi-Ho;Oh, Sea-Jun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.5
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    • pp.97-105
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    • 2006
  • 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. In this paper, with investigation into various methods determining the bursting force of the anchorage, reasonable prestressing order is determined by analysis of PSC beam bridge and PSC box girder bridge with most suitable method. It may be stated that this study would be useful for determining the reasonable prestressing order of tendons for the PSC box girder bridges.

Static Load Test and Nonlinear Analysis on the PSC Box Girder Bridges with Reduced Reinforcements (철근 물량이 절감된 PSC박스거더교에 대한 정적재하실험 및 비선형해석)

  • 정광회;구현본;김성태;박성룡;박성용;김병석
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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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.

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An Experimental Study on the Creep and Shrinkage for the Segment Concrete in PSC Box Girder Bridge (PSC 박스거더 교량에 사용된 세그먼트 콘크리트의 크리프 및 건조수축에 관한 실험적 연구)

  • 최한태;윤영수;이만섭
    • Journal of the Korea Concrete Institute
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    • v.11 no.3
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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.