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프리캐스트 프리스트레스트 콘크리트 중공슬래브 교량의 분절거동
장영길 ( Young-gil Jang ),박기용 ( Gi-yong Park ) 한국고등직업교육학회 2010 한국고등직업교육학회논문집 Vol.11 No.1
Precast construction method for prestressed concrete bridge is increasingly used than the cast-in place construction method due to the effectiveness of construction and quality control. In the precast bridge construction, the behavior of connections between segments which are connected by shear keys is very important. The so-called precast prestressed concrete hollow slab bridge is one of the segmental bridges which can be a long span, so that the structural behavior of joints of adjacent segment should be evaluated by the experiment. In this study, small scaled beam tests were carried out to determine the joint shear key shape and the restraint stress by prestressing. From the test results, it was found that the joint key shape and the restraint stress affect the behavior of segments and the segments which has ratio of the height to the width of shear key 1/3, possess maximum shear resistance.
Dynamic PIV를 이용한 커튼형 에어백 부풀림 장치의 유동해석
장영길(Young Gil Jang),김석(Seok Kim),이상준(Sang Joon Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Passenger safety is one of the most important considerations in the purchase of an automobile. A curtain-type air bag is increasingly adapted in deluxe cars for protecting passengers from the danger of side clash. Inflator housing is a main part of the curtain-type air bag system for supplying high-pressure gases to pump up the air bag-curtain. Although the inflator housing is fundamental in designing a curtain-type air bag system, flow information on the inflator housing is very limited. In this study, we measured instantaneous velocity fields of a high-speed flow ejecting from the inflator housing using a dynamic PIV system. From the velocity field data measured at a high frame-rate, we evaluated the variation of the mass flow rate with time. From the instantaneous velocity fields of flow ejecting from the airbag inflator housing in the initial stage, we can see a flow pattern of broken shock wave front and its downward propagation. The flow ejecting from the inflator housing was found to have large velocity fluctuations and the maximum velocity was about 700m/s. The velocity of high-speed flow was decreased rapidly and the duration of high-speed flow over 400m/s was maintained only to 30ms. After 100ms, there was no perceptible flow.
장영길 ( Young-gil Jang ),박기용 ( Gi-yong Park ) 한국고등직업교육학회 2007 한국고등직업교육학회논문집 Vol.8 No.1
This study investigates nonlinear interface behaviors of concrete filled steel tubular column(CFT) dependent on various confinement pattern under axial load For the purpose of evaluating a confining effect of concrete, the 3D finite element analysis using ANSYS was performed The influence of parameters such as width-thickness ratios, strength of the concrete and the yield strength of the steel, was examined. The suggested evaluation procedure that assembled three parameters were compared with previous experimental results. The obtained results are summarized as follow. The average restriction stress by the restriction effectiveness of the concrete showed the tendency to be reduced as the width-thickness ratio of the steel pipe section increased. It was turned out as the thing by enduring the load bearing equipment much more as the width-thickness ratio small.
장영길 ( Young-gil Jang ),박기용 ( Gi-yong Park ) 한국고등직업교육학회 2011 한국고등직업교육학회논문집 Vol.12 No.3·4
The square strength and design strength are smaller than the experimental strength of square shaped concrete filled tubular columns in a short concentrically loaded columns. In AIJ(Architectural Institute of Japan) design formulas for slender steel-concrete composite beam-columns, the superposed strength is adopted. Design formulas of SRC(Steel encas- ed Reinforced Concrete) Standard or CFT(Concrete Filled Steel Tube) Recommendation ate well predicted, but they ate so complicated to calculate In this paper, we proposed simplified method to calculate the strength of slender CFT beam-columns. Comparison with the experimental data and AIJ design formula was performed, and it was shown that proposed method predicted well and can be used as the design formula
장영길 ( Young-gil Jang ),임청권 ( Cheong-kweon Lim ) 한국고등직업교육학회 2004 한국고등직업교육학회논문집 Vol.5 No.4
This study investigates nonlinear behaviors of concrete filled steel tubular column (CFT) dependent on various confinement pattern under axial load using ANSYS. For the purpose of evaluating a confining effect of concrete, the 3D finite element method was used. The influence of parametersm width-thickness ratios, strength of the concrete and the yield strength of the steel, were examined. The suggested evalution procedure that assembled three parameters was compared with previous experimental results. The obtained results are summarised as follow. (1) The average restriction stress by the restriction effectiveness of the concrete showed the tendency to be reduced as the width-thickness ratio of the steel pipe section increased. (2) It was turned out as the thing by enduring the load bearing equipment much more as the width-thickness ratio small.
표면보수재료와 이중 침투층을 고려한 염화물 거동 해석기법에 관한 연구
장영길 ( Young-gil Jang ),박기용 ( Gi-yong Park ) 한국고등직업교육학회 2009 한국고등직업교육학회논문집 Vol.10 No.1
Chloride ion into concrete is the main deterioration factor of reinforced concrete structures causing the corrosion of reinforcement steel inside concrete due to breaking of the passive layer on surface of the reinforced bars. The chloride ions can be included in the concrete by using sea sands or by ingress of chloride ion through the concrete cover due to splashing salts in marine environment and deicing salts in cold environment. In this study, the diffusion coefficient of chloride ion were evaluated as major durability parameters and a durability evaluation was carried out for concrete structures by considering the quality of both unrepaired concrete and repaired cover concrete. The rapid chloride penetration test was carried out for both repaired concrete and unrepaired concrete, and the diffusion coefficient for both concretes were obtained, respectively. Finally, the service life of repaired concrete structures was derived using obtained diffusion coefficient and compared with those of unrepaired concrete structures.