• Title/Summary/Keyword: 카본시트 튜브로 구속된 콘크리트 기둥

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A Study of Strength Reduction Factor Preparation for Circular Concrete Columns confined by Carbon Sheet Tube (카본시트튜브로 구속된 원형 콘크리트 기둥의 강도감소계수 제안에 관한 연구)

  • Lee, Kyoung-Hun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.6
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    • pp.106-112
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    • 2016
  • In this study, circular concrete column specimens confined by carbon sheet tube with different winding angles and different number of carbon sheet plies(3T, 5T and 7T) were tested to propose design equations and a strength reduction factor. Specimens were designed by 300 mm diameter and 600 mm height with $90^{\circ}{\pm}0^{\circ}$, $90^{\circ}{\pm}30^{\circ}$, $90^{\circ}{\pm}45^{\circ}$, $90^{\circ}{\pm}60^{\circ}$, $90^{\circ}{\pm}75^{\circ}$ and $90^{\circ}{\pm}90^{\circ}$ carbon fiber angles. A 10,000 kN UTM was used for compressive strength test of specimens by displacement control method with 0.01 mm/sec velocity. Estimation equations of compressive strength and ultimate strain of circular concrete column specimens confined by carbon sheet tube using a regression analysis and a strength reduction factor to apply ultimate strength design method of concrete were proposed. The strength reduction factor(${\phi}$) of circular concrete columns confined by carbon sheet tube was estimated as 0.64 by the Monte Carlo Analysis Method. Manufacture and construction process have to be perfectly managed by construction managers because the structural capacities of carbon tubes were depends on construction abilities of manufacturing operators.

Study on the Crack Shape of Concrete Exterior Beam-Column Joints Confined by Carbon Sheet Tube (카본 시트 튜브로 구속된 콘크리트 외부 보-기둥 접합부의 균열 양상에 대한 연구)

  • 문영균;박진영;이경훈;홍원기;김희철
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.09a
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    • pp.199-204
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    • 2003
  • The purpose of this study is to experimentally investigate the structural performance of concrete exterior beam-column joints confined by carbon sheet tube. Four specimens were produced with different numbers of carbon sheet and the other specimen was produced with reinforced concrete. A hydraulic dynamic actuator with 30tonf capacity was used to cyclic lateral loading test. The experimental results represent that the numbers of carbon sheet have an influence the load and displacement capacity. However, the bond length of carbon sheets for connecting beam and column has to be considered to improve the capacity of joint.

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