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고력볼트 스플릿-티 인장접합부의 구조성능에 관한 실험적 연구
최성모,이성희,김진호,Choi, Sung Mo,Lee, Seong Hui,Kim, Jin Ho 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.6
최근 구조물의 정확한 해석을 위하여 접합부의 강성에 반강접 개념이 도입되고 있다. 우리나라의 경우 반강접 접합부의 실험과 이론해석에 대한 연구가 산발적으로 진행되고 있으며, 체계적인 강구조설계를 진행할 정도의 연구성과를 내지는 못 한 상태이다. 그래서 스플릿-티(Split-Tee)를 이용한 접합부의 설계는 국내의 강종과 하중특성을 고려되지 못한 선진국의 연구자료에 의존하고 있는 실정이다. 본 논문은 F10T 고력볼트를 사용한 스플릿-티 접합부의 반강접 특성을 파악하고자, 기둥-보 접합부에 대한 반강접 연구 이전 단계로서 스플릿-티 인장접합부의 구조성능과 변형특성에 대해 실험을 통하여 규명하고자 한다. 플랜지 두께, 도장, 초기도입축력 및 하중가력패턴을 실험변수로 하였으며, 총 20개의 실험체를 제작하여 300ton UTM으로 인장실험을 수행하였다. 각 변수에 따른 스플릿-티 인장 접합부의 구조성능과 거동을 평가하였다. In general, most of the beam-to-column connections for steel structures are regarded as either rigid connections or pin connections. Recently, the concept of a semi-rigid connection was introduced for a correct analysis of steel structures. Several experimental and theoretical researches have been performed regarding the structural behaviors of frames and buildings with semi-rigid connections. The results are not well known, and structural frame/building has not been designed to introduce the concept of semi-rigid connections between a beam and column until this time. To resolve this, this research depends on design specifications prepared by other advanced countries for the design of buildings with semi-rigid connections. Such a specification, however, should incorporate domestic characteristics of steel material properties and load conditions. This paper deals with structural capacities and deformable behaviors for a split-T tensile connection with F10T high-strength bolts to investigate the structural characteristics of semi-rigid frames. The experimental parameters include the thickness of T-flanges, painted or not, preloaded or not, and load pushover pattern. A total of 20 specimens were fabricated and tested with a 300-ton UTM. The structural capacities and behavior for split-T tensile connections were evaluated on each research parameter.
줄 꼬임 구동을 이용한 수확용 그리퍼의 줄기 절단 장치 설계 및 검증
최성모(Seong-Mo Choi),이동우(Dongwoo Lee),황면중(Myun Joong Hwang) 한국로봇학회(논문지) 2024 로봇학회 논문지 Vol.19 No.3
This paper presents a novel stem-cutting device using a twisted string actuation system combined with the cinch bag-typed gripper proposed in previous research. The suggested cutting device was developed to cut the stem of a tomato using two motors. The relationship between contact time and motor angle was mathematically induced, and the contacting time was verified through the experiments. The contact time has decreased as the offset of each pair of strings at the disk increases. The contact time and its deviation were reduced by increasing the radius of the twisted string bundle, and the motor torque to exert an equivalent cutting force was surged at the same time. The proposed cutting mechanism with 16 strands of twisted string bundle and 40 mm of offset can cut the given tomato stems and stalks, exerting up to 132.4 N of cutting force in 4.6 to 6.5seconds.
최성모(Choi Sung-Mo),박영욱(Park Young-Wook),이성희(Lee Seong-Hui) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.12
LEB system is a prefabricated building system of a gable frame fastened by bolts with shape section developed from conventional C-channel section of galvanised steel and standard connectable hardwares. The LEB system is used to small one-story factory and storehouse building within 10m span. In spite of economical and constructional efficiency, it is difficult to be used for long span over 10m because of a structural limitation. Accordingly, performance improvement is required for LEB system. So, this paper suggests three alternatatives to improve structural performances of LEB system which are a development of section detail for section performance, an installation of tie-bar to control a deflection due to a vertical load and an adaption of fixed column bases. In the results, improvement methods in structural performances are proposed and the allowable load graphs for each cases are prepared to correspond to KS Code.
시공성을 향상시킨 용접조립 각형 CFT 편심 장주의 P-M 관계
이성희 ( Seong Hui Lee ),최성모 ( Sung Mo Choi ),김영호 ( Young Ho Kim ) 한국복합신소재구조학회 2015 복합신소재학회논문집 Vol.6 No.2
CFST columns are structurally superior because the concrete inside the steel tubes prevents local buckling at the tubes and the tubes confine the concrete. And, the thickness of steel tube in CFST column has been thinner with development of high-strengh steel. The thinner the steel tube of a square CFST column is, the more local buckling is likely to occur. For this reason, we developed welded built-up square steel tube with stiffeners which are placed at the center of the tube width acts as an anchor. In this study, we conduct experimental test for three specimens of the 4m long span welded built-up square CFT column with parameters of L/D and D/t. And, the test results were compared with the analysis results by M-.-P Program.
강관내부 보강재를 고려한 용접조립 각형 CFT 편심 장주의 내력 및 휨 거동
이성희 ( Seong Hui Lee ),김영호 ( Young Ho Kim ),최성모 ( Sung Mo Choi ) 한국복합신소재구조학회 2015 복합신소재학회논문집 Vol.6 No.2
So far, square concrete filled tubular(CFT) columns have been used in a limited width thickness ratio. The reason is that local buckling occurs in steel tube easily. Once the local buckling occurs, the confinement effect of steel tube on concrete disappears. In this study, we developed welded built-up square steel tube with reinforcement which are placed at the center of the tube width acts as an anchor. 3 specimens of slender welded built-up square CFT columns and 3 specimens of slender welded built-up square steel tube columns were manufactured with parameters of width(B) of steel tube, width thickness ratio(B/t). we conducted a experimental test on the 6 specimens under eccentric load, and evaluated the structural resistance and behavior of 6 specimens.