• Title/Summary/Keyword: Bridge Column

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Design of Expansion Segment of Precast Prestressed Concrete Segmental Box Girder bridges Using Strut and Tie Model (스트럿 타이 모델을 이용한 프리캐스터 프리스트레스 콘크리트 세그멘탈 박스 거더 교량의 신축이음 세그멘트이 설계기법 연구)

  • 오병환;이형준;김익현;한승환
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.04a
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    • pp.268-273
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    • 1995
  • In recent years, precast prestressed concrete segmental box girder bridges have been increasingly constructed Expansion disphragm segment of this type bridge transfers forces from the superstructure onto bearing or column, and plays an important roll of anchorage zone for longitudinal prestressed forces. Non-linear stresses occur inside of diaphragms by these extensive concentrated forces. In this study, the strut-and-tie models are proposed to design an expansion segment rationally. A formula to determine the effective transverse prestressed forces is proposed on the basis of these models. The present study is expected to provide an effective tool to design expansion segment of prestressed concrete bridges rationally.

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Effect of base isolation on the seismic response of multi-column bridges

  • Saiidi, M.;Maragakis, E.;Griffin, G.
    • Structural Engineering and Mechanics
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    • v.8 no.4
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    • pp.411-419
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    • 1999
  • A nonlinear model for time-step analysis of bridges subjected to two orthogonal horizontal components of earthquake motions was developed. The focus of the study was on elastomeric isolators with or without lead cores. The hysteretic behavior of the isolators, the columns, abutments, and shear keys was taken into account. The nonlinear analysis showed that, contrary to linear theory prediction, the use of isolators does not necessarily increase the displacement of the superstructure. Furthermore, it was shown that properly designed isolators can reduce the ductility demand in RC bridge columns substantially.

Quasi-Static Tests on SRC Composite Columns (SRC 합성교각의 준정적 실험)

  • Shim, Chang-Su;Chung, Young-Soo;Jung, In-Keun;Min, Jin;Han, Jung-Hun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.299-302
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    • 2005
  • This study deals with the quasi-static tests on steel reinforced concrete composite columns with single embedded steel or multiple members. For the design of bridge piers, the composite section needs to have low steel ratio for cost savings because the dimension of the pier section is usually large. There is lack of design guidelines for these composite columns with low steel ratio, but the design provisions for the normal reinforced concrete column can be used for the design because of the low steel ratio. It is necessary to provide the design provisions in terms of the strength limit state and seismic performance by the detail requirements on the longitudinal steel and the transverse steel. The test parameters in this study were determined considering the current design provisions on RC columns. Through the quasi-static tests, the seismic performance of the composite columns were discussed.

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An Analytical Evaluation on the Ductility of Reinforced High-Strength Concrete Columns (고강도 콘크리트를 이용한 철근콘크리트 기둥 부재의 연성평가에 관한 연구)

  • 장일영;송재호;한상묵;박훈규
    • Journal of the Korea Concrete Institute
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    • v.12 no.3
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    • pp.57-66
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    • 2000
  • The ductility is an important consideration in the design of reinforced concrete structures. In the seismic design of reinforced concrete columns, it is necessary to allow for relatively large ductilities that the seismic energy be absorbed without shear failure of significant strength degradation after the reinforcement yielding in columns. Therefore, prediction of the ductility should be as accurate as possible. This research investigate the ductile behavior of rectangular reinforced high-strength concrete columns like as bridge piers with confinement steel. The effects on the ductility of axial load, lateral reinforcement ratio, longitudinal reinforcement ratio, shear span ratio, and compressive strength of concrete were investigated analytically using layered section analysis. as the results, it was proposed the proper relationship between ductility and variables and formulated into equations.

Seismic Performance of Prefabricated Piers for Urban MAGLEV (자기부상열차용 급속시공교각의 내진성능)

  • Lee, Jung-Woo;Chin, Won-Jong;Joh, Chang-Bin;Kwark, Jong-Won
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.69-70
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    • 2009
  • This paper investigates the seismic behavior of prefabricated piers which are made by onsite connection of precast composite column segments to accelerate bridge construction. Quasi-static cyclic loading tests on the piers show better overall seismic capacity compared to RC piers with seismic details..

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Design Technique of Steel Structures using Practical Nonlinear Inelastic Analysis (실용적인 비선형 비탄성해석을 이용한 강구조 설계기술)

  • Kim Seung-Eock;Lee Dong-Ho;Jang Eun-Seok
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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    • pp.971-976
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    • 2006
  • This paper presents a design technique of steel structures subjected to static and dynamic loadings using practical nonlinear inelastic analysis software. The beam-column approach using the stability functions and the plastic hinge concept enables the software to suitably predict second-order effects and inelastic behavior of beam-columns. For dynamic analysis. the incremental from of the equation of motion is solved by the use of a step-by-step numerical integration procedure in which the assumption of constant acceleration over a small time step is employed. The accuracy of the analysis program is validated using the results of ABAQUS program and experimental tests. A user-friendly graphic interface of the software is developed to facilitate the modeling process and result interpretation of the problem. A design example of large span bridge is presented to detail the direct design process using the practical advanced analysis software.

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지진하중에 의한 구조물 파괴형상 변화에 대한 메조스케일 해석

  • Kim, Ju-Whan;Hong, Jung-Wuk;Lim, Yun-Mook
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.413-417
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    • 2005
  • A lattice model of a typical bridge column section is analyzed, and results are presented. The lattice is built as an ensemble of line elements and masses, that can capture strain rate dependency of concrete material. The research mainly breaks up into two parts: First, a micro level analysis of the material is executed, and control parameters of the governing equations are derived by matching the results with the common macroscopic properties of concrete material. Then, the properties exhibited by the micro model, which extends the classical material properties are applied to the mesoscale model. Hence, the analysis of the target structure can be performed. In the mesoscale analysis, ramp-like impulse loads are applied at different velocity, so that the contribution of the material level rate dependency to the global behavior of the structure can be tracked.

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A Study on Seismic Performance of Spiral Prer (나선철근교각의 내진성능에 관한 연구)

  • 배성용;김광수;이형준;이재훈
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.363-368
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    • 2000
  • The Korean Bridge Design Standard Specifications adopted the seismic design requirements in 1992. However, The current seismic design requirements for bridges are based on the USA seismic codes for sever earthquake. This provides the basic factors that affects the performance of spiral reinforced concrete piers for seismic loading, and The specimen tests are performed based on load-displacement, effective stiffness and displacement ductility, etc. The quasi-static test was adopted in order to investigate seismic performance of the spiral reinforced concrete pier specimens which had different transverse steel amount, spacing and longitudinal steel ratio under different axial load levels. This study is concluded that seismic design for transverse reinforcement content of spiral reinforced concrete column has influenced on axial load and effective stiffness etc.

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Structural analysis of circular UHPCC form for hybrid pier under construction loads

  • Wu, X.G.;Zhao, X.Y.;Han, S.M.
    • Steel and Composite Structures
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    • v.12 no.2
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    • pp.167-181
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    • 2012
  • Ultra high performance cementitious composite material is applied to the design of multifunctional permanent form for bridge pier in this paper. The basic properties and calculating constitutive model of ultra high performance cementitious composite are introduced briefly. According to momental theory of thin-walled shell, the analytical solutions of structural behavior parameters including circumferential stress, longitudinal stress and shear stress are derived for UHPCC thin-walled circular tube. Based on relevant code of construction loads (MHURD of PPC 2008), the calculating parameter expression of construction loads for UHPCC thin-walled circular tube is presented. With geometrical dimensions of typical pier, the structural behavior parameters of UHPCC tube under construction loads are calculated. The effects of geometrical parameters of UHPCC tube on structural behavior are analyzed and the design advices for UHPCC tube are proposed. This paper shall provide a scientific reference for UHPCC permanent form design and UHPCC hybrid structure application.

Time Estimation of Forming and Extinguishing Arc in the dc Contactor at Opening Contacts (접점 개방시 직류 접촉기의 아크 형성과 소호 시간 예측법)

  • Cho Hyun-Kil;Lee Eun-Woong;Kim Jun-Ho
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.788-790
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    • 2004
  • This paper describes the phenomenon of the molten metal bridge theory of the arc discharge at opening contacts. And we analyze the magnetic force and drag force acting on the arc column in the DC magnetic contactor Arc cooling time by the force convection is calculated in the thermal dynamic equation using mean temperature method. Since arc gas lost conduction characteristics below a such temperature, it verify that the process of forming and extinguishing arc is able to analyze in terms of temperature characteristic by simulation and experiments of the 3 types arc extinction unit. It propose the practical simulation method to improve the electrical endurance of dc contactor.

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