• 제목/요약/키워드: 중공 교각

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원형 내부 구속 중공 RC 기둥의 심부 구속 횡방향 철근 연구 (Transverse Reinforcement for Circular Internally Confined Hollow RC column)

  • 원덕희;한택희;박우선;박종섭;강영종
    • 한국산학기술학회논문지
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    • 제14권2호
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    • pp.927-935
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    • 2013
  • 최근 지진의 발생빈도가 과거에 비해서 증가하면서 교량 구조물에도 내진성능에 대한 연구가 활발하게 진행되고 있다. 그 중 교량 하부 구조물의 경우에는 횡방향 하중에 저항하기 위하여 소성힌지 부분에 심부 구속 횡철근을 배근하여 횡방향 구속 효과를 증대시키고 있다. 이것은 심부 구속 횡철근 배근을 통하여 교각에 필요한 강성 및 연성을 확보하여 내진성능을 향상시키고자 하는 것이다. 현재 심부구속 횡방향 철근량 산정에 대한 설계 기준은 국내의 도로교 설계 기준과 국외의 대다수 설계 기준이 동일한 설계 기준을 사용하고 있고, 이는 중실 철근 콘크리트 기둥을 대상으로 제안되어 있다. 이 식을 내부 구속 중공 RC 기둥에 그대로 적용하기에는 그 구성 요소가 상이하고 거동 특성이 다르기 때문에 무리가 따른다. 본 연구에서는 내부 구속 중공 RC 기둥에 현행 기준을 적용하였을 때의 해석적 방법에 의한 변위 연성도 분석을 통하여 특성을 분석하고 경제성 있고 합리적인 설계가 될 수 있도록 수정식을 제안하였다.

물량저감 철근상세를 갖는 중공 철근콘크리트 교각 시스템: II. 실험 및 해석 (Hollow Reinforced Concrete Bridge Column Systems with Reinforcement Details for Material Quantity Reduction: II. Experiments and Analyses)

  • 김태훈;김호영;이재훈;신현목
    • 한국지진공학회논문집
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    • 제18권1호
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    • pp.9-18
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    • 2014
  • The purpose of this study is to investigate the seismic behavior of hollow reinforced concrete bridge column systems with reinforcement details for material quantity reduction and to provide the details and reference data. Five hollow reinforced concrete bridge columns were tested under a constant axial load and a cyclically reversed horizontal load. The accuracy and objectivity of the assessment process can be enhanced by using a sophisticated nonlinear finite element analysis program. The adopted numerical method gives a realistic prediction of seismic performance throughout the loading cycles for several the investigated test specimens. This study documents the testing of hollow reinforced concrete bridge column systems with reinforcement details for material quantity reduction and presents conclusions based on the experimental and analytical findings.

인장강성효과를 고려한 중공단면 교각의 모멘트-곡률 관계에 대한 연구 (A Study on the Moment-Curvature Relation of Hollow RC piers considering Tension Stiffening Effect)

  • 박영호;김세훈;최승원;오병환
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.17-20
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    • 2005
  • Moment-curvature relation of RC pier is influenced greatly in occurrence form of crack and difference is happened according to consideration existence and nonexistence of tension stiffening effect. However, studies considering these is very insufficient misgovernment. Also, it is sometimes unavoidable lap splice of axial reinforcement in plastic hinge region of RC piers. However, specific design standard about lap splice of axial reinforcement is unprepared real condition and study about effect that lap splice of axial reinforcement get in occurrence form of crack is insufficient misgovernment. Therefore, in this paper, experiments are performed with hollow RC piers that do lap splice of axial reinforcement by main variable. And this study present analytical method about moment-curvature relation of hollow RC pier that consider tension stiffening effect and analyze effect that lap splice of axial reinforcement gets in occurrence form of crack. Analytic method of moment-curvature relation of RC pier that present in this study shows very similar motion with experiment result and crack interval of RC pier is suffering dominate impact in the augmented reinforcement amount by lap splice and average crack interval decreases as lap splice ratio increases.

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조립식 물량저감 중공 철근콘크리트 교각의 성능평가 (Performance Assessment of Hollow Precast Segmental Bridge Columns with Reinforcement Details for Material Quantity Reduction)

  • 김태훈;박동규;이재훈;신현목
    • 한국지진공학회논문집
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    • 제20권1호
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    • pp.33-43
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    • 2016
  • This study investigates the performance of hollow precast segmental bridge columns with reinforcement details for material quantity reduction. The proposed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. The precast segmental bridge columns provides an alternative to current cast-in-place systems. We tested a model of hollow precast segmental bridge columns under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis in Higher Evaluation System Technology (RCAHEST), for analysis of reinforced concrete structures. The used numerical method gives a realistic prediction of performance throughout the loading cycles for hollow precast segmental bridge column specimens investigated. As a result, proposed reinforcement details for material quantity reduction was equal to existing reinforcement details in terms of required performance.

삼각망 철근상세를 갖는 새로운 중공 철근콘크리트 교각 (New Hollow RC Bridge Piers with Triangular Reinforcement Details)

  • 김태훈;김호영;이재훈;신현목
    • 한국지진공학회논문집
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    • 제20권1호
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    • pp.21-31
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    • 2016
  • This study investigates the seismic performance of new hollow reinforced concrete (RC) bridge piers with triangular reinforcement details. The developed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. We tested a model of new hollow RC bridge piers with triangular reinforcement details under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis in Higher Evaluation System Technology (RCAHEST), for analysis of RC structures. The used numerical method gives a realistic prediction of seismic performance throughout the loading cycles for several hollow pier specimens investigated. As a result, developed triangular reinforcement details for material quantity reduction was equal to existing reinforcement details in terms of required performance.

물량저감 철근상세를 갖는 중공 철근콘크리트 교각단면에 관한 매개변수 연구 (Parametric Study on Hollow Reinforced Concrete Bridge Column Sections with Reinforcement Details for Material Quantity Reduction)

  • 김태훈;김호영;이재훈;신현목
    • 한국지진공학회논문집
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    • 제17권4호
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    • pp.159-169
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    • 2013
  • The purpose of this study is to investigate the inelastic behavior of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction and to provide the details and reference data. Among the numerous parameters, this study concentrates on the shape of the section, the reinforcement details, the diameter of the transverse reinforcement and loading types. Eighteen column section specimens were tested under quasi-static monotonic loading. In this study, the computer program RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) was used. A modified lateral confining effect model was adopted for the hollow bridge column sections. This study documents the testing of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction and presents conclusions based on the experimental and analytical findings.

변위연성도를 고려한 RC 사각단면 기둥의 전단강도 (The shear strength of RC rectangular sectional columns considering displacement ductility)

  • 선창호;김익현
    • 한국지진공학회논문집
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    • 제14권2호
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    • pp.37-47
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    • 2010
  • RC교량이 내진성능을 확보하기 위해서는 교각의 연성도가 목표연성도에 도달하기 전에 발생하는 전단파괴가 방지되어야 한다. 이를 위해서는 신뢰성 있는 전단강도 평가식이 요구된다. 횡하중을 받는 RC기둥의 전단강도는 변위연성도의 증가에 따라 감소 하는 특성을 나타낸다. 다수의 연구자에 의해 전단강도 식이 제안되어 있으나 변위연성도가 작은 구역에서의 초기전단강도와 연성도 증가에 따른 전단강도의 감소율에서 많은 차이를 보이고 있다. 본 연구에서는 저자들이 제안한 초기전단강도를 기본으로 하여 다른 연구자에 의해서 수행된 많은 기둥실험 결과를 분석하여 변위연성도를 고려한 새로운 전단강도 평가식을 제안하였다, 제안된 평가식은 다른 평가식과의 비교를 통해 정확도가 크게 개선된 것을 확인하였다.