한국강구조학회 논문집 (Journal of Korean Society of Steel Construction)

  • 제28권2호
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  • Pages.109-120
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  • 2016
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  • 1226-363X(pISSN)
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  • 2287-4054(eISSN)
한국강구조학회 (Korean Society of Steel Construction)
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570MPa급 고강도강을 적용한 콘크리트 채움 U형 하이브리드 합성보의 휨거동 및 설계

Flexural Behavior and Design of Concrete-filled U-shape Hybrid Composite Beams Fabricated from 570MPa High-strength Steel

  • 투고 : 2015.03.17
  • 심사 : 2016.03.29
  • 발행 : 2016.04.27
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초록

본 연구에서는 콘크리트 채움 U형 하이브리드 합성보의 실물대 휨 실험을 수행하고 평가하였다. U형 강판의 웨브에는 공칭인장강도 400MPa 일반강종의 강재(SS400) 하부플랜지에는 공칭인장강도 570MPa 고강도 강재(SM570)의 강판을 각각 적용하였다. 연구의 주요 목적은 최대의 휨성능을 발현할 수 있는 하이브리드 단면구성과 설계지침의 개발이었다. 4점 단조가력실험의 수행을 통해 제안된 모든 하이브리드 합성보 실험체들은 의도한대로 소성모멘트 이상의 강도발현과 충분한 연성거동을 나타내었다. 그리고 하이브리드 합성단면의 소성중립축의 위치가 상부 콘크리트 기준으로 합성단면 전체깊이의 15%이내에 존재할 경우 휨강도 산정 시 소성응력분포법의 적용이 가능할 것으로 판단되었다. 또한 실험결과를 기반으로 하이브리드 합성보에 적합한 강성산정과정을 제안하였다.

Flexural tests of full-scale concrete-filled U-shape hybrid composite beams were conducted. Ordinary (SS400) and high-strength (SM570) steel plates were used in the web and in the bottom flange of U-shape steel section respectively. The primary objectives were to develop the hybrid section configuration with maximized flexural capacity and to investigate its flexural strength and deformation capacity. All the hybrid test specimens in this study exhibited the plastic moment capacity and resonable deformability. It is shown that the plastic stress distribution can be assumed in calculating the flexural strength of the proposed hybrid composite beams if the plastic neural axis is located within 15% of the total beam depth from the top of the composite slab. The procedure for computing the effective flexural stiffness of hybrid composite beams is also recommended based on test results.

키워드

참고문헌

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피인용 문헌

  1. Flexural Capacity of a New Composite Beam with Concrete-Infilled Tubular Lower Flange vol.7, pp.12, 2017, https://doi.org/10.3390/app7010057
  2. Development and Seismic Performance Testing of Asymmetric Hybrid Composite Beam-to-Column Connections vol.31, pp.1, 2019, https://doi.org/10.7781/kjoss.2019.31.1.053
  3. 고강도강재를 적용한 비대칭 하이브리드 합성보의 휨거동 실험 vol.29, pp.3, 2016, https://doi.org/10.7781/kjoss.2017.29.3.217
  4. Shear Strength of Composite Beams with Steel Angle-Fabricated Truss vol.31, pp.2, 2019, https://doi.org/10.7781/kjoss.2019.31.2.129
  5. Prediction of Tubular T/Y-Joint SIF by GA-BP Neural Network vol.24, pp.9, 2020, https://doi.org/10.1007/s12205-020-1200-1