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축 하중을 받는 강구조 보-기둥 반강접 접합부의 이력거동
양철민(Yang Cheol-Min),정명채(Cheong Myung-Chae),김영문(Kim Young-Moon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.2
The objective of this study is to accumulate the knowledge of cyclic behavior of semi-rigid connection. To accomplish this goal, cyclic loading tests were conducted using semi-rigid connection comprised of top, seat, and web angles in comparison with fully rigid and simple alternatives. Here, experimental tests for three types of beam-to-column connections subjected to the combined action of cyclic bending moment and constant axial force were undertaken. These test specimens were single sided beam-to-column assemblies that are representative of exterior beam-to-column connections. Each specimen have only one type of beam-to-column connection: Double Web Angle(DWA), Top-and seat-angle with Double web angle(TSD) and Fully Welded connection(FW). The experimental results and the key parameters characterizing the performance of the tested specimens are presented in the present paper.
양철민(Yang Cheol-Min),유장열(You Jang-Youl),김영문(Kim Young-Moon) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Numerous studies have been undertaken to improve the behavior of the pre-Northridge moment connection. The development of new concepts and strategies for economical design of steel structures is becoming a world-wide pursuit. Recently, the new concept with high-strength bolts has been proposed. The use of high-strength bolts in steel connection has recently provided some challenges to structural engineers. The present study focuses on the improvement of capacity of bolted Top and Seat angles with Double web angle connection (TSD), especially in the moment-resistance and initial stiffness. To achieve this goal, the shape of top and seat angles was modified in order to avoid early yield or fracture. Therefore, the present study provides a modified TSD connection, the so called the Modified TSD connection (MTSD). TSD and MTSD connection were studied by the component method (EC3). Results from theoretical analysis of TSD and MTSD connection are discussed, and the effect of modified angle on connection stiffness and moment-resistance are assessed.
Component method를 이용한 외부 철골 죠인트에 대한 초기강성의 근사적 평가
양철민(Yang Cheol-Min),김영문(KIm Young-Moon) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
This paper reports on the evaluation of the initial stiffness of steel joints using component method as well as experimental tests. The component method is currently the widely accepted procedure for the evaluation of the various design values. According to the component method, application of the component method to steel joints requires the following three main steps : (1) definition of the constitutive components, (2) evaluation of their mechanical properties, (3) assembly of the components to derive the joints properties. An application to a cantilever beam-to-column steel joint is presented and compared to the experimental results obtained under cyclic loading condition. Comparison between numerical and experimental results allows to conclude that the numerical model is able to simulate, with a good level of accuracy for initial stiffness, the behaviour of beam-to-column joints.
변형된 TSD반강접 접합부를 갖는 모멘트 저항 강골조의 내진성능
양철민(Yang Cheol-Min),정명채(Cheong Myung-Chae) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
The semi-rigid solutions, that use angles connecting the web and flanges of the beam to the column flange, are cheaper and simpler to assemble, when compared to conservative solutions (rigid and simple). As long as the Top and Seat angles with Double web angle (TSD) connection necessarily have the clearance which is a distance between the column flange and the end of beam, the top and seat angles are inevitably fractured. To avoid this fracture, the author proposed the Modified TSD connection (MTSD). The present work is concerned with the seismic performance of semi-rigid frames with MTSD connections subjected to earthquake load. In order to evaluate the influence of MTSD semi-rigid connections on the seismic response of steel frames, a 5 story steel structure was designed in accordance with the AISC-LRFD (2000) and the Korean Building Code-Structural (KBC2005). In particular, the investigation is to consider the effects of semi-rigid connections on the earthquake responses of structures by comparing that with rigid connections. Two analytical procedures are applied to the structures with MTSD semi-rigid or rigid connection for seismic analysis: Nonlinear Static Procedure(NSP) and Nonlinear Dynamic Procedure (NDP). The seismic performance of the structure were done by using MidasGen program, developed by MidasIT Co. Ltd.
플라즈마 처리에 의한 폴리비닐리덴플로라이드 나노섬유의 젖음성
이승훈,장선호,소윤미,이헌수,양철민,윤중현,김찬,Lee, Seung-Hoon,Jang, Seon-Ho,So, Yun-Mi,Lee, Hun-Su,Yang, Cheol-Min,Yun, Jung-hyun,Kim, Chan 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1
Poly(vinylidene fluoride) (PVDF) is a critical polymeric material used in the mass production and application of electrospun nanofibers, and is popular due to its excellent properties. However, electrospun PVDF nanofibers are very hydrophobic and possess low surface energies, limiting their broad application. In this work, we investigated practical methods for the hydrophobic surface modification of PVDF nanofibers using four techniques: radio-frequency (RF) and PIN-type atmospheric plasmas, planar inductively coupled plasma (ICP), and planar capacitively coupled plasma (CCP). The use of RF atmospheric plasma was ineffective under the experimental conditions used, while the PIN-type atmospheric plasma efficiently modified PVDF nanofiber surfaces locally. The application of planar CCP to PVDF nanofibers was more effective than planar ICP for the same experimental conditions. In particular, the water contact angles of samples treated with planar CCP for 600 s and 900 s were $25^{\circ}$ and $10^{\circ}$ respectively, and wettability improved. Analysis with FT-IR, XPS, and FE-SEM showed that the surface CF and CH hydrophobic groups were destroyed without damaging the PVDF nanofibers, and hydrophilic species such as C=O, OH, and COOH were formed. As a consequence, quantitative analysis of nanofiber chemical composition is necessary when treated by plasmas, providing insight into the correlation of specific property changes with processing conditions, and indicating precise research results and application examples.
아라미드 나노섬유로 강화된 탄소섬유 강화 복합재료의 동적 기계적 특성 분석
구민예(MinYe Koo),양철민(Cheol-Min Yang),이교우(GyoWoo Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, CFRPs (carbon fiber reinforced plastic) reinforced with ANFs (aramid nanofibers) were fabricated to investigate the dynamic mechanical analysis (DMA). Also, CFRPs reinforced with MWCNTs (multi-walled carbon nanotubes) were produced to be compared for filler effects in the composites. Those nano filler reinforced CFRPs were made by a hand-ray up method and vacuum bagging process. Through the tan δ of DMA, the damping property was evaluated. CFRPs reinforced with ANFs showed a higher tan δ than the neat CFRP by the effect of boundary sliding (filler-filler) and interfacial sling (filler-matrix). Improving damping property from tan δ results was expected to lead the energy dissipation when the external force was applied.
반복하중을 받는 볼트 접합된 외부 보-기둥 접합부의 성능
양철민,김영문 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This paper persents an experimental investigation on the cyclic behavior of steel assemblages with fixed, semi-rigid and flexible connections. The studies consisted of subjecting three connection assemblages to an increasing level of large cyclic rotations until failure occurred. The main objectives of the experimental studies were to directly compare performance of connections. The result of this study show that semi-rigid connection was developed about 38% of rigid connection for initial rotational stiffness, and simple connection about 4.3%. Also, the hysteretic energy dissipation capabilities of the connections were determined, and the mechanism of failure was identified. Test observations show that the stiffness of weld connection is not fully rigidity, whereas for angle connection, it is not ignorable.