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

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Temperature Analysis of PSC Box-girder Bridges Using Inverse Thermal Analysis Program (온도분포 역해석 프로그램을 이용한 PSC 박스거더 교량 단면의 온도 분포 해석)

  • Park, Min-Seok;Jo, Byung-Wan;Lee, Myung-Kue
    • Journal of the Korean Society of Safety
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    • v.21 no.4
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    • pp.95-101
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    • 2006
  • It is well known that the thermal load in PSC(prestressed concrete) box-girder bridge is the principal cause of detrimental crack. The longitudinal stress caused by the lateral stress from the temperature gradient in slab of PSC box-girder bridge has a considerable influence on the durability and economy of bridge structures. As the basic study for the rational consideration of thermal load and the derivation of design guide, the inverse thermal analysis program for PSC box-girder bridges using field measurement data is developed. In this paper, thermal analyses are performed using field monitoring data for the sample PSC box-girder bridge. It is proposed that the link between monitoring program and the inverse analysis program is available.

An Experimental Study for Structural Safety Evaluation of PSC Box Girder Bridge with FRP Struts (FRP 스트럿을 가진 PSC 박스거더교의 구조안전성 평가를 위한 실험 연구)

  • Song, Jae-Joon;Park, Jong-Hwa;Park, Kyung-Hoon;Jo, Byung-Wan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.6
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    • pp.205-213
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    • 2008
  • The structure of PSC box girder with FRP strut has a form of supporting the cantilever part in the widened upper slab by modifying the existing PSC box girder efficiently, and it is able to build an economical and aesthetically pleasing bridge as it reduces the size of the lower structure by reducing the self-weight of the upper structure. In this research, loading test of PSC Box Girder using full-scale mock-up was conducted and FEM analysis was performed. By comparing results, structural safety of the FRP strut and the upper slab following application of the strut in the PSC Box Girder Bridge were evaluated.

A Study on Design for Anchorage Zone in PSC Box Girder Bridge Using Strut-Tie Model (스트럿-타이 모델을 이용한 PSC 박스거더교량의 정착부 설계 연구)

  • 이주하;윤영수;이만섭;김병석
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.625-630
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    • 2002
  • PSC box girder is widely used in a domestic bridge and overpass, etc., therefore, the design and construction technique for the PSC box girder is developing day by day. Even if it were so, however, the design for anchorage zone in PSC box girder has depended on common sense and empirical results. And it is the current situation that the designer has difficulty due to inadequacy of provisions in the domestic design code and lack of understanding for behavior of anchorage zone. Besides, the design based on Leonhardt's method is being done in general, but the design may be various even for the same structure because of the difference in a way of applying. In this paper, therefore, anchorage zone in PSC box girder bridge is analyzed and designed by using strut-tie model. Adequacy for the application of strut-tie model is verified by comparison with the way used in current design practice, and this study presents that strut-tie model can be a rational and an economical design than current design methods.

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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
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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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Development of the Program Checking the Constructible Possibility of Prestressed Concrete Box Girder Bridges (PSC 박스 거더교의 시공성 검사 프로그램 개발)

  • 김병석;김영진;강재윤;한석희
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.701-705
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    • 1998
  • The objective of this study is to develop the practical program which can check the constructible possibility of prestressed concrete box girder bridges for design. Checking constructible possibility is defined as checking the interference of each elements in a PSC box girder bridge and computing the distances of each elements. To check the constructible possibility of a PSC box girder bride, bridge must be modelled using solid in three dimension. By using a 3 dimensional solid modeling system, engineers can get the photo realistic 3D viewing images of the bridge and produce FEM analytic model of it. Users can manipulate their drawings easier and take off quantity of the whole structure and its elements as well as check the constructible possibility of their PSC box girder bridges.

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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.

Design & Construction of PSC Box-Girder Bridge with Central Suspension by Extradosed Cables and Constant Girder Depth (중앙일면식 케이블과 등형고를 갖는 Extradosed PSC 교량의 설계 및 시공)

  • 조의경;김성일;박종화;이수열
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.618-625
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    • 2003
  • The recent development of PSC girder bridges are mostly dedicated for optimization of self-weight, simplification of girder section for easy construction and minimization of maintenance efforts. Moreover some of those bridges are required as a landmark facility which raises the image of locality and harmony with surroundings. An extradosed bridge is one of the best alternates which not only covers the longer span than PSC box girder and also performs the role of landmark facility with much cheaper cost than cable stayed bridge. Hyundai is carrying out the construction of unique style extradosed bridge which have central suspension system and uniform girder depth named Keong-An grand bridge on the Sungnam-Janghowon Express highway. In this paper, major process of design and construction features of Keong-An bridge is presented.

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Behavior of PSC BOX Girder Bridges under Temperature Load (PSC 박스거더교의 온도하중에 대한 거동 연구)

  • 강상규;이형준
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.1157-1162
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    • 2000
  • Transverse stress and longitudinal crack which are induced by temperature difference in box-girder sections and slab of which box-girder is composed have an important effect on endurance and economical efficiency of bridges. The study on longitudinal behavior of bridges which are subject to thermal load is reflected on the design of bridges. But, the study on transverse behavior of bridges has been performed just recently in foreign countries of finding the cause of longitudinal crack and in Korea, has not been tried in spite of large temperature variance due to geographical condition. This study examines temperature distribution feature in box-girder sections and bridge behavior due to thermal load, with measuring temperature distribution and stress of PSC box-girder bridge which is being constructed actually, and investigates appropriateness of design thermal load of highway bridge design code.

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Analysis of PSC Box Girder Railway Bridge and Design of its Diaphragm using Sturt-and-Tie Model (PSC 박스 거더 철도교량의 해석 및 스트럿-타이 모델에 의한 격벽부 설계)

  • Song, Ha-Won;Kim, Hyoung-Woon;Kim, Young-Hoon;Byun, Keun-Joo
    • Journal of the Korean Society for Railway
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    • v.1 no.1
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    • pp.30-39
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    • 1998
  • The functions of diaphragms at abutments and piers of PSC box girder railway bridge are to transfer forces from the superstructure onto bearings or columns and to stiffen the superstructure cross-section against in -plane deformation. Due to stress disturbance at diaphragm, the design for the diaphragm using conventional design method is relatively irrational than those for other structural members. And, due to contribution to boundary condition of deck slab by the diaphragm, the behavior of deck slab near the diaphragm is different from that of the deck slab obtained from two dimensional analysis of the bridge, which is basis for the design of deck slab. In this paper, three dimensional behavior of deck slab near the diaphragm of prestressed concrete (PSC) box girder railway bridge constructed by the precast span method are analyzed by using three dimensional finite element modeling and using the strut-and-tie model design of the diaphragm are presented. The modeling techniques used in this paper can be applied effectively to examine the causes of cracks at deck slab near diaphragm and to design diaphragm rationally.

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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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