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골재분리가 발생된 PSC 박스 거더교의 안전성에 관한 실험적 연구
이채규(Lee Chae-gue),안영기(Ahn Young-gi),박훈규(Park Hoon-gyu),진남희(Jin Nam-hee) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
When a PSC box-girder bridge is constructed, aggregate segregation is likely to happen especially in the lower flange and web concrete. In order to evaluate the effect of aggregate segregation on the safety of PSC box girder bridge, an experimental as well as analytical study was undertaken for the case of two-span continuous PSC box-girder bridge damaged by aggregate segregation. The behavioral changes of the bridge such as transverse deflection, deflection restoring in cases of loading/unloading and the variation of neutral axis were measured/analyzed and the live load carrying capacity factor of the bridge was also calculated. It seems that the effect of aggregate segregation on the safety and behavioral change of a PSC box-girder bridge is negligible.
골재분리가 발생된 PSC 박스 거더교의 안전성에 관한 실험적 연구
이채규 ( Lee Chae-gue ),안영기 ( Ahn Young-gi ),박훈규 ( Park Hoon-gyu ),진남희 ( Jin Nam-hee ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
When a PSC box-girder bridge is constructed, aggregate segregation is likely to happen especially in the lower flange and web concrete. In order to evaluate the effect of aggregate segregation on the safety of PSC box girder bridge, an experimental as well as analytical study was undertaken for the case of two-span continuous PSC box-girder bridge damaged by aggregate segregation. The behavioral changes of the bridge such as transverse deflection, deflection restoring in cases of loading/unloading and the variation of neutral axis were measured/analyzed and the live load carrying capacity factor of the bridge was also calculated. It seems that the effect of aggregate segregation on the safety and behavioral change of a PSC box-girder bridge is negligible.
유기훈(Ki-Hoon Yoo),김기영(Gi-Young Kim),안영기(Yeong-Gi Ahn),차동원(Dong-Won Cha),신구환(Goo-Hwan Shin),김동국(Dong-Guk Kim),채장수(Jang-Soo Chae),장중순(Joong-Soon Jang) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.1
In this study, we propose reliability prediction of a satellite by function analysis. To do so, the intended functions of the satellite are derived from using function structure block diagram, and defined as main, sub, and detailed functions. Furthermore, in order to generate function and reliability structure table, reliability model rule, duty cycle, and types of switch are assigned to the classified functions. This study also establishes reliability block diagram and mathematical reliability models to schematize the relationship among the functions. The reliability of the classified function is estimated by calculating the failure rate of parts comprising them. Finally, we apply the proposed method to a small satellite as a case study. The result shows that the reliability for the detailed function and the sub function as well as the main function could be predicted quantitatively and accurately by the proposed approach.