• Title/Summary/Keyword: 조립식 교각

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Effects of Design Parameters on Structural Performance of Precast Piers with Bonded Prestressing Steels (부착 긴장재를 가진 조립식 교각 설계변수의 구조성능에 미치는 영향)

  • Shim, Chang-Su;Yoon, Jae-Young
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.1A
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    • pp.15-26
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    • 2010
  • Quasi-static tests were conducted to evaluate structural performance of precast piers prestressed by bonded prestressing steels. Combinations of prestressing bars and normal reinforcing bars, embedded steel tubes and prestressing strands were used as continuous steels crossing the joints of a precast pier. Main design parameters were steel ratio, magnitude of prestress force, and section details. Flexural strength and energy dissipation capacity of precast columns with higher steel ratio showed better performance due to continuous steels after opening of the joints. Precast piers with embedded members showed stable behavior after reaching maximum loads resulting in higher displacement ductility and energy dissipation capacity increased as the introduced prestress increased. Self-centering behavior at early stages and stress increase of confining reinforcements were observed from highly prestressed columns. Combination of prestressing steels and normal reinforcing bars should be used in design to prevent rapid strength degradation after reaching the maximum load.

Precast Segmental PSC Bridge Columns with Precast Concrete Footings : II. Experiments and Analyses (조립식 기초부를 갖는 프리캐스트 세그먼트 PSC 교각 : II. 실험 및 해석)

  • Kim, Tae-Hoon;Kim, Young-Jin;Lee, Jae-Hoon;Shin, Hyun-Mock
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.4A
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    • pp.407-419
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    • 2009
  • The purpose of this study is to investigate the seismic behavior of precast segmental PSC bridge columns with precast concrete footings and to provide the details and reference data. Six precast segmental PSC bridge columns were tested under a constant axial load and a cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. A bonded or unbonded tendon element based on the finite element method, that can represent the interaction between tendon and concrete of prestressed concrete member, is used. A joint element is modified to predict the inelastic behaviors of segmental joints. This study documents the testing of precast segmental PSC bridge columns with precast concrete footings and presents conclusions based on the experimental and analytical findings.

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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Analytical Study on the Inelastic Behavior of Precast Segmental Prestressed Concrete Bridge Piers (조립식 프리스트레스트 콘크리트 교각의 비탄성거동에 관한 해석적 연구)

  • Kim, Tae-Hoon;Jin, Byeong-Moo;Kim, Young-Jin;Shin, Hyun-Mock
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.5 s.45
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    • pp.29-40
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    • 2005
  • The purpose of this study is to investigate the inelastic behavior of precast segmental prestressed concrete bridge piers. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. An unbonded tendon element based on the finite element method, that can represent the interaction between tendon and concrete of prestressed concrete member, is used. A joint element is newly developed to predict the inelastic behaviors of segmental joints. The proposed numerical method for the inelastic behavior of precast segmental prestressed concrete bridge piers is verified by comparison with reliable experimental results.

Analytical Study on Joints in Precast Segmental Prestressed Concrete Bridge Piers (조립식 프리스트레스트 콘크리트 교각의 접합부에 관한 해석적 연구)

  • Kim, Tae-Hoon;Jin, Byeong-Moo;Kim, Young-Jin;Shin, Hyun-Mock
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.1 s.53
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    • pp.79-87
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    • 2007
  • This paper presents an analysis procedures of Joints in precast segmental prestressed concrete bridge piers. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. An unbended tendon element based on the finite element method, that can represent the interaction between tendon and concrete of prestressed concrete member, is used. A joint element is newly developed to predict the inelastic behaviors of segmental joints. The proposed numerical method for joints in precast segmental prestressed concrete bridge piers is verified by comparison with reliable experimental results.

Long-term Behavior of Precast Circular Composite Piers with Bonded Tendons (강연선으로 긴장한 강재매입형 조립식 합성교각의 장기거동)

  • Yoon, Jae-Young;Shim, Chang-Su;Chung, Young-Soo;Lim, Hyun-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.205-208
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    • 2008
  • Steel-embedded composite piers can enhance the resistance of core concrete by confinement of the steel elements and also can strengthen the stability of the embedded steel elements by concrete parts, so that the resistance of the composite members and seismic requirements can be provided without increasing section dimensions and self-weight. While modular composite piers with single segment do not need prestressing, precast segment composite piers with multiple segments need to have prestressing to prevent excessive cracking at the joints. Initial stresses and deformation by the introduced prestress are changed by long-term properties of concrete and need to be considered in the design. This paper deals with the prestress losses by the measurement of load cells, strains of reinforcements, concrete and embedded steel tubes.

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Nonlinear Seismic Analysis of Hollow Cast-in-place and Precast RC Bridge Columns with Triangular Reinforcement Details (삼각망 철근상세를 갖는 현장타설 및 조립식 중공 철근콘크리트 교각의 비선형 지진해석)

  • Kim, Tae-Hoon;Ra, Kyeong-Woong;Lee, Jae-Hoon;Shin, Hyun Mock
    • Journal of the Korea Concrete Institute
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    • v.28 no.6
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    • pp.713-722
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    • 2016
  • The goal of this study was to assess the seismic performance of hollow cast-in-place and precast reinforced concrete bridge columns with triangular reinforcement details. The developed material quantity reduction details are economically feasible and rational, and facilitate shorter construction periods. By using a sophisticated nonlinear finite element analysis program, the accuracy and objectivity of the assessment process can be enhanced. The used numerical method gives a realistic prediction of seismic performance throughout the input ground motions for several hollow column specimens investigated. As a result, triangular reinforcement details were designed to be superior to the existing reinforcement details in terms of required seismic performance.

Performance of Precast Composite Piers for Fast Construction (급속시공형 프리캐스트 합성교각의 성능)

  • Shim, Chang-Su;Chung, Young-Soo;Yoon, Jae-Young;Park, Ji-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.221-224
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    • 2008
  • Recently various types of prefabricated pier has been developed. In this paper, prefabricated composite columns with core steel elements embedded in concrete were proposed, which has no prestressing. Based on the previous research on composite columns with low steel ratio, the column were designed. A simple bolt connection detail between a footing and a pier element were also suggested. In order to investigate the seismic performance of the composite columns, several tests on concrete encased composite columns, which are prefabricated, were performed. Quasi-static tests were carried out and their performance was evaluated and compared with the results from the tests on CIP composite piers. In the case of precast piers, the end part of the pier needs to be carefully reinforced and related recommendations on details were derived.

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Evaluation of Seismic Performance of Prefabricated Bridge Piers with a Circular Solid Section (중실원형단면 조립식 교각의 내진 성능 평가)

  • Kim, Hyun-Ho;Shim, Chang-Su;Chung, Chul-Hun;Kim, Cheol-Hwan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.3 s.55
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    • pp.23-31
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    • 2007
  • Fast bridge construction has been increasingly needed according to the changed construction environment. This paper deals with quasi-static tests on precast piers for bridge substructures. One of the most crucial aspect of the design of precast prestressed concrete bridge piers is the seismic performance. Seven precast pier elements were fabricated. The amount of prestressing bars, the prestressing force, and the location and number of the joint between segments were the main test parameters. Test results showed that the introduced axial prestress made the restoration of the deformation under small lateral displacement and minor damage. However, there was no effect of the prestress when the plastic hinge region was damaged severely due to large lateral displacement. Judging from the observed damage, the design of the joints in precast piers should be done for the first joint between the foundation and the pier segment. The amount of the necessary prestressing steel may be designed to satisfy the P-M diagram according to the service loads, not by having the same steel ratio as normal RC bridge piers. In order to satisfy the current required displacement ductility, it is necessary to have the same amount of the transverse reinforcements as RC piers. As the steel ratio increases, the energy absorption capacity increases. The number of joints showed a little influence on the energy absorption capacity.

Nonlinear Finite Element Analysis of Prefabricated PSC Columns with Precast Footing (프리캐스트 기초부를 갖는 조립식 PSC 교각의 비선형 유한요소 해석)

  • Park, Young-Gi;Kim, Tae-Hoon;Cheon, Ju-Hyoun;Park, Se-Jin;Kim, Young-Jin;Shin, Hyun-Mock
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.177-178
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    • 2009
  • This study is based on the precast concrete bridge which recently became important field of bridge construction. to develop the connecting technology of pier and footing, the purpose of this study is to verify applicability through the result of nonlinear analysis.

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