• Title/Summary/Keyword: PSC박스교

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A Case Study on the Life Cycle Cost Analysis of Steel Box Girder and Prestressed Concrete Box Girder Bridge (Steel Box교와 PSC Box교의 LCC 분석에 관한 사례연구)

  • Ahn Jang-Won;Cha Kang-Suk;Kim Yong-Su
    • Korean Journal of Construction Engineering and Management
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    • v.2 no.2 s.6
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    • pp.59-67
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    • 2001
  • The purpose of this study is to evaluate economics by the Life Cycle cost(LCC) analysis of Steel Box Girder and Prestressed Box Girder bridge types. The study has been performed as a case study. A questionnaire survey for the repair and replacement cycle has been done in order to predict operation and maintenance costs. For LCC analysis and comparison, the present value technique is used. The results of this study are summarized as follows: (1) A LCC analysis model of Steel Box Girder and Prestressed Box Girder bridge types is suggested through a case study. (2) The repair and replacement cycle of elements of them are investigated using a questionnaire survey. (3) As a result of LCC case study, the type of Prestressed Box Girder bridge is analyzed more economic than Steel Box Girder.

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Dynamic Behavior Analysis of PSC Train Bridge Friction Bearings for Considering Next-generation High-speed Train (차세대 고속철의 증속을 고려한 PSC 철도교 마찰 교량받침의 동적 거동 해석)

  • Soon-Taek Oh;Seong-Tae Yi
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.6
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    • pp.39-46
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    • 2023
  • In this study, the dynamic behavior of friction bearings of PSC (Pre-Stressed Concrete) box train continuous bridge was numerically analyzed at 10 km/h intervals up to 600 km/h according to the increasing speed of the next-generation high-speed train. A frame model was generated targeting the 40-meter single-span and two-span continuous PSC box bridges in the Gyeongbu High-Speed Railway section. The interaction forces including the inertial mass vehicle model with 38 degrees of freedom and the irregularities of the bridge and track were considered. It was calculated the longitudinal displacement, cumulative sliding distance and displacement speed of the bridge bearings at each running speed so that compared with the dynamic behavior trend analysis of the bridge. In addition, long-term friction test standards were applied to evaluate the durability of friction plates.

The Study of Creep and Shrinkage Behaviour of PSC Bridge Using Quasi-Conforming Shell Element (준적합 쉘 요소를 이용한 PSC교량의 크리프 및 건조수축 거동 연구)

  • Kim, Hyun-Gi;Byun, Yun-Joo;Kim, Do;Kim, Bum-Jun;Kim, Ki-Du
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.327-330
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    • 2009
  • PSC 박스 교량의 시공 중 거동 특성을 고려하기 위하여 뼈대 요소를 이용한 시공단계의 설계가 수행되고 있다. 그러나 PSC 박스 교량 중 곡선 램프교 등의 경우는 교량의 외측 및 내측의 변위 및 응력 값이 현저히 다르다. 따라서 PSC 박스 교량의 텐던량 및 시공 중 긴장력이 외측 및 내측에서 다르게 산정되어야 함에도 불구하고 현실적으로는 계산이 불가능하여 같은 양의 텐던과 부적절한 긴장력을 사용하고 있어 비효율적인 설계와 시공이 이루어지고 있다. 이러한 문제점을 해결하기 위하여 내외측의 텐던량을 다르게 고려할 수 있고 교량의 내외측 반력, 응력, 변위 분포를 얻을 수 있는 3차원 해석이 필수적으로 요구 되고 있다. 본 연구에서는 PSC 박스 교량의 3차원 거동 해석을 위하여 텐던 및 크리프, 건조수축을 반영한 준적합 쉘요소를 이용하여 수치해석을 수행하였으며 크리프 및 건조수축의 특성은 ACI코드와 CEB/FIP 코드를 적용하여 비교분석하였다. 각각의 결과 값이 상이한 경우도 있지만 대체로 두 코드는 비슷한 양상을 보였으며 CEB/FIP 가 좀 더 경제적인 설계가 됨을 알 수 있었다.

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Optimum Design of PSC Box Girder Bridge considering the Influence of Unequal Span Length Division, Load Factor, and Variable Girder Depth (부등 경간 비율, 하중계수 및 변단면의 영향을 고려한 PSC 박스 거더교의 최적설계)

  • 박문호;김기욱
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.17 no.3
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    • pp.309-318
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    • 2004
  • This research automatically designed psc-box girder bridges by using an optimum design program and applied the results to the various types of bridges to verify if common facts used in steel bridges or concrete bridges can be applied to PSC bridges. Namely, it investigated appropriate unequal span length division by comparing with bridge of unequal and equal span length division, and verified the influence of the load factors which are changed by time or specification applying the results to various types of bridge. and it applied reinforced concrete bridge and steel bridge's variable girder depth which is slender and effective to save material costs to PSC box girder bridges. Technical solution of optimum design program used SUMT procedure, and Kavlie's extended penalty function to allow infeasible design points in the process. Powell's direct method was used for searching design points and a gradient's approximate method was used to reduce the design time.

Development of an Assumed Strain Shell Element for the Three Dimensional Construction Stage Analysis of PSC Bridge (PSC 교량의 3차원 시공 중 해석기법을 위한 가정된 변형률 쉘 요소 개발)

  • Kim, Ki-Du;Song, Sak Suthasupradit;Hwang, Hyun-Jin;Park, Jae-Gyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.3
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    • pp.108-117
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    • 2010
  • The frame element is commonly used for construction stage analysis PSC bridges. However, the frame element does not show sufficient information in the curved PSC box bridges. For the case of curved PSC bridges, the deformations in the inner and outer web are different. In this case, the different jacking forces are required in the inner and outer webs. And it is impossible to calculate different jacking forces in the inner and outer webs if we use the frame element for construction stage analysis. In order to overcome this problem, the use of shell element is essential for a three-dimensional construction stage analysis of PSC bridges. In the following, the formulation of an assumed strain shell element and its application of PSC box girder bridge analysis are presented.

Evaluation of Tension of PSC Box Girder Bridges Using Risk Matrix (리스크 매트릭스를 활용한 PSC박스 거더교의 긴장재 평가)

  • Kim, Hyungjo;Ji, Seunggu;Kim, Hunkyom;Kim, Pilsoo;Kim, Hunkyom;Lee, Minjae
    • Korean Journal of Construction Engineering and Management
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    • v.19 no.5
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    • pp.53-60
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    • 2018
  • In particular, the investigation of tendons in PSC Box Girder Bridge should be done in a systematic way. It is important to identify preventative maintenance activities that should be carried out in order to analyze the risk factors by type of representative tensions and to reduce risks in the long term. However, in the current maintenance system, various methodologies for investigating and repairing tensions have been studied, but it is difficult to investigate precisely tensions. Therefore, to apply the risk assessment for screening of tensions to the domestic PSC Box Bridge, we presented a risk matrix evaluation index that is consistent with the state assessment and maintenance system.