• Title, Summary, Keyword: 콘크리트 충전 강교각

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The Evaluation of Seismic Performance for Concrete-filled Steel Piers (콘크리트 충전 강교각의 내진 성능 평가)

  • 정지만;장승필;인성빈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.5
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    • pp.53-58
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    • 2002
  • A recent development, a concrete-filled steel(CFS) pier is an alternative to a reinforced concrete bridge pier in an urban area, because of its fast construction and excellent ductility against earthquakes. The capacity of CFS piers has not been used to a practical design, because there is no guide of a seismic design for CFS piers. Therefore, the guide of a seismic design value is derived from tests of CFS piers in order to apply it to a practical seismic design. Steel piers and concrete-filled steel piers are tested with constant axial load using quasi-static cyclic lateral load to check ductile capacity and using the real Kobe ground motion of pseudo-dynamic test to verify seismic performance. The results prove that CFS piers have more satisfactory ductility and strength than steel piers and relatively large hysteretic damping in dynamic behaviors. The seismic performance of steel and CFS piers is quantified on the basis of the test results. These results are evaluated through comparison of both the response modification factor method by elastic response spectrum and the performance-based design method by capacity spectrum and demand spectrum using effective viscous damping. The response modification factor of CFS piers is presented to apply in seismic design on a basis of this evaluation for a seismic performance.

An Experimental Study on Distribution of Ultimate Strength of Concrete-Filled Steel Tube Columns according to Concrete Strength and Section Properties Ratio (콘크리트강도 및 단면특성에 따른 콘크리트 충전강관(CFT) 기둥의 극한강도 분포에 관한 실험적 연구)

  • Jang, Gab-Chul;Chang, Kyong-Ho
    • Journal of the Korean Association for Spatial Structures
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    • v.8 no.5
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    • pp.59-65
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    • 2008
  • Recently, to improve the load carrying capacity of column structures such as bridge piers, application to concrete-filled steel tube(CFT) type columns are increased more and more. To design the concrete-filled steel tube(CFT) columns in accuracy, influence of material and geometry properties and aspect ratio on ultimate strength of the concrete-filled steel tube column is investigated by experimental researches. In this investigation, the ultimate strength distribution of the concrete-filled steel tube column in accordance with diameter-thickness ratio(D/t) and steel-concrete area ratio(As/Ac) are clarified by the compressive tests. Futhermore, parametric experimental investigation on concrete target strength is performed. It was known from experimental observation that ultimate strength of concrete-filled steel tube column under axial compressive loading more depends on section properties of steel tube rather than concrete strength.

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Performance Evaluation of Scale-down Concrete Filled FRP Columns (축소모형실험을 통한 콘크리트 충전 FRP 합성교각의 성능 평가)

  • Youm, Kwang-Soo;Lee, Seung-Hwe;Lee, Young-Ho;Song, Jae-Joon;Hwang, Yoon-Koog
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.13 no.1
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    • pp.135-144
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    • 2009
  • The present paper represents experimental studies on the performance of concrete filled FRP columns. Eight scale-down specimens were conducted by quasi-static cyclic loading test. FRP thickness, concrete strength, horizontal rebar ratio, and diameter were selected as test parameters. The capacities of ductility for cyclic loading was evaluated and the damping ratio and failure mode from the stiffness reduction of each test specimen were compared.

Seismic Evaluation of concrete-Filled Steel Piers with Secondary Reinforcement (보조보강재가 있는 콘크리트 충전 강교각의 내진성능 평가)

  • 박병기
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.349-356
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    • 2000
  • Strenght and ductility are major factors in the aseismic design of a bridge pier. In spite of good performance in both steel piers have not been used widely due to high cost. But with the filled-in concrete the steel pier have advantages compare to the steel pier only such as improved strength ductility fast construction small section and reasonable cost. In this paper concrete-filled steel piers are tested using quasi-static cyclic lateral load with constant axial load to evaluate the performance. The secondary reinforcement devices such as bolts corner plate and turn buckle are used inside of the piers to improve the ductility with minimum additional cost. Test results shows filled-in concrete and secondary reinforcement devices increase the strength and the ductility of the steel pier.

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The Study on the Structural Behavior of Concrete-filled Composite Piers (콘크리트충전 강합성 교각의 구조적 거동에 관한 연구)

  • 김유경
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.151-158
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    • 2000
  • In this paper, It is presented that concrete-filled composite piers have large energy-absorption capacity and high strength and stiffness on account of mutual confinement between the steel plate and filled-in concrete. Concrete-filled composite columns were tested to failure under axial compression and cyclic lateral loading. Displacement ductility index obtained by using the load-displacement relation has been increased with the increment of filled-in concrete length, while it has been decreased according to the incrementation of width-thickness ratio, slenderness ratio and the number of loading cycles. Structural behavior and ductility index estimated for the seismic design showed that composite piers could be used as a very efficient earthquake-resistant structural member. The response modification factor could be re-evaluated for concrete-filled composite piers.

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The Seismic Performance for Concrete-filled Steel Piers (콘크리트 충전 강교각의 내진 성능)

  • 정지만;장승필;인성빈
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.189-196
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    • 2002
  • The capacity of CFS piers has not been used to a practical design, because there is no guide of a seismic design for CFS piers. Therefore, the guide of a seismic design value is derived from tests of CFS piers in order to apply it to a practical seismic design. Steel piers and concrete-filled steel piers are tested with constant axial load using quasi-static cyclic lateral load to check ductile capacity and using the real Kobe ground motion of pseudo-dynamic test to verify seismic performance. The results prove that CFS piers have more satisfactory ductility and strength than steel piers and relatively large hysteretic damping in dynamic behaviors. The seismic performance of steel and CFS piers is quantified on the basis of the test results. These results are evaluated through comparison of both the response modification factor method by elastic response spectrum and the performance-based design method by capacity spectrum and demand spectrum using effective viscous damping. The response modification factor of CFS piers is presented to apply in seismic design on a basis of this evaluation for a seismic performance.

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