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3D 프린터로 제작된 비정형 거푸집의 최대 측압에 대한 유한요소해석
이정호,주영규,김학범,Lee, Jeong-Ho,Ju, Young K.,Kim, Hak-Beom 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4
The F3D(Free-Form Formwork 3D Printer) technology that manufactures EPS(Expanded Polystyrene) formworks for irregular-shaped concrete structures by 3D printers was developed to reduce the cost and time. Because of weak strength and low elastic modulus of the EPS, structural performance including lateral pressure by fresh concrete of the formwork that consisted of EPS should be investigated. In order to calculate lateral pressures acting on formwork, several variables including sizes, shapes of formwork, tangential force(fricition) between fresh concrete and formwork, and material properties of fresh concrete should be considered. However, current regulations have not considered the properties of concrete, only focused on vertical formwork. Galleo introduced 3-dimensional finite element analysis models to calculate lateral pressure on formwork. Thus, proposed finite element analysis model based on previous studies were verified for vertical formwork and irregular-shaped formwork. The test results were compared with those by FEM analysis. As a result, the test agrees well with the analysis.
TVS경량체가 적용된 이방향 중공슬래브-기둥 접합부 뚫림전단거동의 실험적 평가
이영은,류재호,주영규,김상대,김재건,Lee, Yung-Eun,Ryu, Jae-Ho,Ju, Young-K.,Kim, Sang-Dae,Kim, Jae-Keon 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11
Same as flat plate slab system, punching shear fracture is able to occur at the connection of two-way void slab and column. It is one of the biggest weak points of the two-way void slab, but there is none of regulation for punching shear strength of two-way void slab. Also the studies on punching shear behavior of two-way void slab are not enough to make a regulation. In this study, the punching shear behavior of two-way void slab with TVS lightweight ball is experimentally explored with parameters of different location of void around the column and usage of shear reinforcement. The result data shows that as the distance between column and void increases, punching shear strength increases as well. In addition, according to inferring inclined crack from two-way void slab, the location of void affects to slope of the inclined crack. Consequently, a new control perimeter is suggested. Also, revised design equation for punching shear strength of two-way void slab is devised by using shear strength reducing factor.
반복하중에 대한 웨브전이형 다이아그리드 노드의 구조적 특성
김영주,정인용,주영규,김상대,Kim, Young Ju,Jung, In Yong,Ju, Young K.,Kim, Sang Dae 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.3
다이아그리드 노드의 지진 및 바람에 의한 반복하중에 대한 구조성능을 해석적으로 평가하는 것은 용접특성의 반영이 어려워서 한계가 있다. 이 연구에서는 횡하중을 받는 다이아그리드 노드의 구조거동을 알아보기 위해 다이아그리드의 노드부를 축소한 모형을 이용해 실험을 수행했다. 실험체는 총 5개이며 실험의 변수는 각 부분의 용접방법, 측면스티프너와 가새 웨브의 겹침길이이다. 한쪽 대각가새에는 인장력을, 다른쪽 대각가새에는 압축력을 가하는 반복가력 실험을 수행하였다. 실험 결과 주요 파괴 원인은 축력과, 방향이 상이한 두 힘의 합력으로 인한 부가적 모멘트에 의한 작용으로 나타났다. 인장력에 의해서 가새 부재의 플랜지가 파단하였고, 압축력에 의해서 가새 플랜지의 국부좌굴이 일어났다. 또한 겹침길이와 용접타입은 초기 강성, 항복 내력 및 에너지 흡수능력에 영향을 미치는 것으로 나타났다. The results of the analysis of the structural behavior of diagrid nodes that were subjected to cyclic loads such as wind and earthquakes was not fully understood due to difficulties in considering the welding type. In this study, diagrid nodes were tested to determine their behavior when they are subjected to seismic or wind loads. Five specimens were designed and fabricated. The corresponding test parameters were the welding type for each point and the length of the overlap of the side stiffener and the brace web. Tensile force was applied to one diagrid brace member, and compression force was applied to the other diagrid brace member. Cyclic loading was applied until the failure. The test showed that failures are due to axial stress from axial force and the additional bending moment of the two combined axial forces that have different directions. Tensile failure was observed from the tensile force, and local buckling was observed from the compressive force at the flange of the brace member. In addition, the welding type and the length overlap affected the initial stiffness, the yielding stress, and the energy absorption of the diagrid node.
프리스트레스트 콘크리트 슬래브의 내화성능 예측에 대한 해석적 연구
민정기,박민재,주영규,Min, Jeong-Ki,Park, Min Jae,Ju, Young K. 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.1
In fire design for floors, the three criteria of stability, integrity and insulation are required for the specified fire resistance duration. Among these, stability is not easy to confirm. For solid prestressed concrete slabs of uniform thickness, Eurocode 2 provides tabulated data and specifies an axis distance to the centroid of strands to achieve particular fire resistance ratings, but it is not clear if this data can be used for a wide range of different prestressed slab profiles. In order to verify the current code-fire ratings for precast prestressed slabs, both simple and advanced calculation methods are investigated. This paper examines the use of calculation methods, accounting for the real behaviour of unprotected simply supported prestressed concrete slabs exposed to the standard ISO 834 fire. The calculated fire resistance of each prestressed concrete slab is compared with tabulated data in Eurocode part 1.2, with detailed discussion.
GFRP 플레이트로 보강된 새로운 경량중공합성 바닥시스템의 전단성능 평가
박세호,류재호,주영규,김상대,Park, Se-Ho,Ryu, Jae-Ho,Ju, Young-K.,Kim, Sang-Dae 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
As the demand of high-rise residential buildings increases, newly systems maintaining good point of composite beam and developing serviceability was developed in and outside the country. But it also can't realize a long span structure. Thus there are some requirements for a new floor system that the long span, the reduced height, the improvement of serviceability, and the excellent fire proof can be achieved. For these reasons, we developed the Light-Weight Void Composite Floor using Glass Fiber Reinforced Plastic that can raise a stiffness without increasing weight and can offer a tension ability and fire resistant performance. In this study, it is subject to evaluate the shear performance through the proposal concerning shear design and the test result to evaluate applicability of new composite slab system in practice.
김명한,김도현,주영규,김상대,Kim. Myeong Han,Kim. Do Hyun,Ju. Young K.,Kim. Sang Dae 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4
비좌굴가새는 우수한 내진성능을 보이는 시스템이다. 그러나 비좌굴가새는 약진이나 바람과 같은 영역의 하중에 대하여 에너지를 소산시키지 못한다. 기존의 비좌굴가새의 성능을 개선한 하이브리드 비좌굴가새(H-BRB)는 비좌굴가새와 점탄성댐퍼로 구성된 복합댐퍼시스템의 일종이다. H-BRB의 풍진동제어성능을 해석적으로 규명하기 위하여 해석모델로 40층 철골조 건물을 일반가새골조, 비좌굴가새, 하이브리드 비좌굴가새 3가지로 설계하였다. 또한 세 가지 모델에 대한 정해석과 시간이력해석을 수행하였다. 시간이력해석시 풍동실험결과로부터 산정한 10년 재현주기의 풍하중 자료를 사용하였다. 해석결과에 따르면 하이브리드 비좌굴가새는 기존 비좌굴가새시스템을 사용한 구조물의 횡변위와 사용성을 향상시키는데 효과적이다. The paper investigates the effect of Hybrid Buckling-Restrained Brace(H-BRB) on the serviceability of a high-rise building under wind loads. While Buckling-Restrained Brace(BRB) has been known as a good energy dissipated device under large events, its performance is rather weak when subjected to minor earthquakes or wind loads. A hybrid damper system, H-BRB which is composed of a Viscoelastic damper and BRBs has been developed to improve the performance of BRBs. In this paper, three 40-story steel buildings with normal steel braces, BRBs and H-BRBs are selected for the analytical investigation and their performances under wind loads are evaluated by using a static analysis and time history analysis. Wind force data (10 year return period) obtained from wind tunnel test was used in the time history analysis. It is concluded that H-BRB is effective to reduce the story displacement and to improve the serviceability of the building with BRB.