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오재열,이득행,황진하,조해창,김강수 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
As building structures become much larger and higher in recent years, the hybrid structural members of steel and reinforced concrete are considered as an effective option for horizontal members, because they are suitable for long span and for saving story height. Although many hybrid horizontal members has been developed and studied by researchers or engineers, there is still a lack of efficient system that satisfies such structural demands. This study, therefore, proposed a prestressed composite beam with corrugated web, which is suitable for improving workability on site, structural performance, and economic feasibility. Five full-scaled specimens were fabricated and tested until their flexural failures. The test results showed that the proposed composite member can provide high flexural strength and excellent ductility compared to the typical composite beam tested in this study.
오재열 ( Oh Jae Yuel ),이세정 ( Lee Se Jung ),최현수 ( Choi Hyunsu ),최성모 ( Choi Sung-mo ),양일승 ( Yang Il Seung ) 한국복합신소재구조학회 2020 복합신소재구조학회논문집 Vol.11 No.6
과거에는 건축물의 지하구조물은 지반에 둘러싸여있어 지진이 발생했을 때 지반과 함께 움직이기 때문에 지진에 대한 내진설계가 요구되지 않았다. 하지만, 지진에 대한 사례분석과 연구결과를 바탕으로 지하구조물에도 내진설계가 필요하다는 결론에 도달하였다. 또한, 기존 건축구조기준의 건축물에 대한 내진설계에서는 지하구조물에 대한 내진설계조항이 명확히 규정되어 있지 않았으나, 지하구조물 내진설계 기준이 포함된 KDS가 시행됨에 따라 횡력에 저항할 수 있는 보-기둥 접합부의 수요가 증가할 것으로 예상된다. 강관기둥에 사용되는 보-기둥 접합부는 보에서 기둥으로 하중을 전달하기 위해서 다이어프램을 설치하는 형태의 접합부가 일반적이다. 이때 설치되는 다이어프램은 제작성 및 시공성을 저하시키며, 지하구조물 공법과 적합성이 맞지 않아 시공시 많은 문제점이 있다. 이러한 문제점을 해결하기 위해서 이 연구에서는 다이어프램을 설치하지 않고 기둥의 두께를 증가시켜 보에서 기둥으로 하중을 전달하는 접합부 3개와 삼각형 유닛을 조립하여 제작한 접합부 1개를 제작하여 인장력을 전달하는 실험적 연구를 수행하였다. 실험결과는 구조기준에서 제시하고 있는 집중하중이 작용하는 강관의 강도와 비교하여 분석하였다. In the past, a seismic design for underground structures of buildings was not required because such structures were believed to move with the ground as an earthquake occurred. However, based on the case study and research on earthquakes, it has been concluded that seismic design is necessary for underground structures. The current standards for seismic design provisions are not clearly defined, but the implementation of KDS containing seismic design standards for underground structures is expected to increase the demand for beam-to-column connections that can resist lateral forces. Beam-to-column joints used in steel tubular columns typically have diaphragms installed to help transfer loads from beams to columns. However, these diaphragms reduce the productivity and constructability, and many problems occur during construction due to their incompatibility with other construction methods. To overcome this issue, this experimental study examined force resistance by producing three specimens that carry loads from beams to columns; each column had a different thickness, and one specimen was constructed by assembling triangular units without installing a diaphragm. The results were analyzed by comparing the strength of the steel pipe under which the concentrated load was applied., Stress Concentration.
불연속웨브가 도입된 프리스트레스트 강-콘크리트 합성보의 휨성능 평가
오재열(Oh, Jae-Yuel),이득행(Lee, Deuck-Hang),김강수(Kim, Kang-Su),강현(Kang, Huyn),김흥열(Kim, Heung-Youl),김형준(Kim, Hyung-Jun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
A corrugated steel plate has very little axial stiffness in longitudinal direction due to the accordion effect resulted from its geometric characteristics. Based on this phenomenon, the corrugated webbed steel beams can be utilized for prestressed members to get greater prestressing efficiency on the top and bottom flanges of steel beams that are the main resistant elements against the bending moment. Also, the resistance to any unbalanced construction loading can be improved and the composite action between concrete and steel web can be significantly enhanced by the corrugated web. Due to this reason, researches on the corrugated webbed steel beams have been continued so far. Manufacturing the corrugated webs, however, may have considerable disadvantageous in workability and economical point of view. In this study, therefore, the prestressed composite beam with discontinuous webs has been developed to improve such shortcomings of the corrugated webbed steel beam system. In order to verify the structural performance of the developed prestressed steel-concrete composite beam, its prestressing efficiency has been compared to the steel beams with corrugated webs by finite element analysis, and two full-scaled specimens were also fabricated and tested to evaluate their structural behavior.