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  • Title/Summary/Keyword: Slab bridge

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A Study on the Dynamic Behavior a 3 Span Continuous Extradosed PSC Railway Bridge (3경간 연속 Extradosed PSC 철도교의 동적거동에 관한 연구)

  • Kim, Sung-Il;Kim, Yun-Tae;Gill, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.9 no.2 s.33
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    • pp.137-144
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    • 2006
  • The Extradosed PSC 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. Since the cable-stayed long span bridge is more flexible than general medium span bridges and railway bridges can be experienced resonance phenomenon by repeated equidistant axle loading of the train, it is inevitable to consider the dynamic behavior on impact, deflection and so on. In the present study, the dynamic behavior of an Extradosed PSC railway bridge subjected to moving train forces is analyzed. As well as trains which operate in conventional railway tines, KTX train is also considered. For the estimation of dynamic performances of the Extradosed PSC bridge, vertical deflection, accelerations of the slab, end rotation of the girder and impact on pylons and cables are discussed.

The Application Of F.C.M(Free Cantilever Method) Case Study Of The Railway Bridge (철도교량 F.C.M(Free Cantilever Method) 공법 시공사례 연구)

  • Kwon, Soon-Seob;Kim, Kyong-Yeon;Choi, Dong-Kee;Jeong, In-Choul;Shin, Sang-Chul
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.562-567
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    • 2005
  • F.C.M applied from Jin Jung Li to Yang Su Li(660m) in Puk Han River Bridge(1,414m) construction part is a construction method on the double-track construction which is the third section part of work, called Chung Ang Railroad Line(Deok-SoWon-Ju). This method is the beginning application on Railroad Bridge. After completing upper slab structure, there are several following works such as setting up ballast, sleepers and laying long rails. So it is important to consider the properties of Railroad Bridge while designing the length of bridge and its single span. After the physical process study the shrinkage and creep of concrete, bending up by prestressing in general PSM bridge, relaxation of tendons as time goes by after post-tension, the conclusion of such a study is applied to the Puk-Han River Bridge in this construction field.

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The Relationship between the Load Carrying Capacity and Transformed Impact Factor of Highway Bridge (교량의 공용내하력과 환산충격계수 관계 연구)

  • Chai, Won-Kyu;Lee, Myeong-Gu
    • Journal of the Korean Society of Safety
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    • v.27 no.6
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    • pp.138-143
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    • 2012
  • In this thesis, the relationship between the load carrying capacity and the transformed impact factor of the highway bridges were studied. The bridges are classified according to superstructures type. The result of the comparison between the load carrying capacity and the transformed impact factor, if the load capacity ratio of 0.57, the transformed impact factor was less in order of RC T-beam bridge, RC slab bridge, PC beam bridge, I-beam bridge. By the regression analysis on these results, the empirical formulae to predict the the load carrying capacity of bridge were suggested.

Numerical Modeling of Reinforced Concrete Bridge Panels for Vibration Analysis (연속슬래브교량의 고유진동해석에 대한 수치모형)

  • Park, Je-Sun;Shim, Do-Sik;Lee, Jung ho;Jung, Kyoung-Il
    • Journal of Industrial Technology
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    • v.17
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    • pp.205-211
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    • 1997
  • The problem of deteriorated highway concrete slab is very serious all over the world. Before making any decision on repair work, reliable non-destructive evaluation is necessary. One of the dependable methods is to evaluate the in-situ stiffness of the slab by means of obtaining the natural frequency. By comparing the in-situ stiffness with the one obtained at the design stage, the degree of damage can be estimated rather accurately. In this paper, the numerical modeling of vibration analysis to three span continuous reinforced concrete bridge with elastic intermediate support is presented.

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Long-term Behavior of IPC Girder Bridge (IPC 거더 교량의 장기거동 해석)

  • 권승희;김진근;이상순;한만엽
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.107-112
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    • 2001
  • The IPC(Incremental Prestressed Concrete) which is gradually introducing the tensile force by tendons has been recently developed for reducing the effective depth of PSC bridges. As well known, concrete experiences long-term deformation such as creep and drying shrinkage, and the prediction of the long-term behavior of concrete bridges is essential for both safety and serviceability aspects. This paper was analysed the long-term behavior of a continuous 2-span IPC girder bridge taking into consideration of creep, drying shrinkage and the time of tensile force introduction. As results, the shrinkage of slab concrete increases the negative moment at interior support, and the The difference of concrete ages between slab and girder increases the camber. The effect of initial tensile force is larger than the effect of secondary tensile force in the tendons.

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An Improved Finite Element Modeling Technique for Prestressed Concrete Girder Bridges (PSC보 교량의 유한요소 모델링방법에 관한 연구)

  • 김광수;박선규;김형열
    • Journal of the Korea Concrete Institute
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    • v.11 no.5
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    • pp.33-40
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    • 1999
  • An improved finite element modeling technique is proposed for the assessment of load carrying capacity of partially prestressed concrete girder bridges. Based on the finite element method of analysis, shell and frame elements are used to model the slab and girders of the superstructure, respectively. In the modeling of superstructure, the emphasis is placed on the use of rigid link between the middle surface of slab an mid-plane of girder. This paper also includes the comparision of three different equations that are used in the calculation of effective moment of inertia for the partially prestressed concrete girders. Numerical analysis is performed for the unstrengthened and strengthened bridges. The obtained results are compared with those of load test for a prototype bridge. A good agreement is achieved between the numerical solutions by using the proposed method load test results.

A Study on Construction Method for Joints between Old and New Concrete Deck Slabs (콘크리트 교량 바닥판 신구접합부의 시공방안에 관한 연구)

  • Paek Nak Seung;Choi Young Chul;Cha Soo Won;Oh Byung Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.363-366
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    • 2005
  • When widening or repairing concrete deck slab, there is a joint inevitably. However, joining-construction method have following problem, that is the additional stress in existing part of bridge resulting from the specific process of joining-construction and the difference of amount of shrinkage between new and existing bridge. On this study, compared shrinkage stress of the direct joining construction method with the indirect joining construction method, and concluded the proper substitution rate of expansion cement. The rate of replacement was proper at 10%. but more than 15%, concrete had excessive expansion and weeker compressive strength. The time of placing closure concrete, considering the shinkage stresses and creep, was suitable in 45\~60 days after placing the new concrete deck slab.

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Finite strip method in probabilistic fatigue analysis of steel bridges

  • Li, W.C.;Cheung, M.S.
    • Steel and Composite Structures
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    • v.2 no.6
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    • pp.429-440
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    • 2002
  • A finite strip method is developed for fatigue reliability analysis of steel highway bridges. Flat shell strips are employed to model concrete slab and steel girders, while a connection strip is formed using penalty function method to take into account eccentricity of girder top flange. At each sampling point with given slab thickness and modulus ratio, a finite strip analysis of the bridge under fatigue truck is performed to calculate stress ranges at fatigue-prone detail, and fatigue failure probability is evaluated following the AASHTO approach or the LEFM approach. After the failure probability is integrated over all sampling points, fatigue reliability of the bridge is determined.

A Study for Stiffness Improvement Method with Use of Filled Concrete in Continued Steel Box Girder Bridge (강상자형 연속교에서 콘크리트재를 이용한 부모멘트 구간의 강성향상공법)

  • 구민세;이호경
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.10a
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    • pp.69-78
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    • 1999
  • The stiffness of slab concrete section is not considered as effective in the existing method of construction for continued steel box girder bridge. Using lifting system and filled concrete, it is possible to make stiffness of slab concrete section effective and improve stiffness of negative moment section. It was proved that the stress of upper flange in positive moment is significantly lower than case of existing method through the stress comparison. This stress difference made possible to rearrange flange thickness and as the result of this rearrangement, the amount of steel and height of girder can be reduced up to 13.23% and 11.5%.

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A Study on the Anti-Vibration Characteristics of the Under Sleeper Pad (방진침목패드의 방진특성에 관한 연구)

  • 황선근;엄기영;고태훈;오상덕
    • Proceedings of the KSR Conference
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    • 2001.05a
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    • pp.369-374
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    • 2001
  • It was estimated that the anti-vibration measures at the source location of railroad are the most active and effective ones. Among CWR(Continuously Welded Rail), elastic rail fastener, floating slab, ballast mat, under sleeper pad, etc. like these various kinds of measures in the source, under sleeper pad as an anti-vibration measure was constructed at the railroad track supporting structures in the Jeon-la Line. In this study, through the field measurement of vibration at the railroad track supporting structures and nearby the ground, the vibration reduction effect of under sleeper pad were evaluated by insertion loss. As a result, vibration reduction effects were 5.0∼12.5㏈ on the concrete slab of the bridge, 3.9∼7.5㏈ on the ground nearby the bridge respectively.

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