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송진규 ( Jin Gyu Song ),김옥현 ( Ock Hyun Kim ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.1
Shock absorber reduces speed of a colliding objects and eventually stops them softly to prevent damage by collision. It increases contacting period of the colliding objects, so that it lowers the peak colliding force by spreading it in a longer contacting period. The principle is that it dissipates the kinetic energy of colliding objects through fluid friction of its internally equipped fluid flow orifices. In this research a testing instrument has been developed to verify characteristics of shock absorbers experimentally. The instrument is developed such that a mass(steel block) is dropped vertically at a certain height under gravity. The mass is guided to collide a shock absorber assembled on a load cell which is firmly mounted on a base. At different height the mass is dropped under gravity and the colliding force is measured by the load cell. The testing instrument is also equipped with a data acquisition system such that digital data of the force variation with time are obtained in real time. A commercial shock absorber with multiple orifices is chosen and its characteristics are measured using the developed testing instrument. It is confirmed that the developed testing instrument is successful to get experimental data about the shock absorbing characteristics.
고로슬래그와 나트륨계열 활성화제를 이용한 무시멘트 모르타르의 특성
송진규(Song Jin-Gyu),양근혁(Yang Keun-Hyeok),김건우(Kim Geon-Woo),김병조(Kim Byeng-Jo) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.6
It has been increasing the demand of Eco-friendly materials which have low environmental effects and consume low energy. Such demands have led the study of alkali-activated ground granulated blast-furnace slag(AAG) mortar and concrete to be developing. In this study it was verified that 13 AAG mortar had been developed the compressive strength. 7 AAG mortar were set. Among them, sodium hydroxide and sodium silicate were shown high strength. So they were chosen to evaluate the compressive strength and the flow value of each contents. And sodium hydroxide or sodium silicate were mixed with another activators for improving performance. Compressive strength of AAG mortar with sodium hydroxide and sodium sulfate or sodium carbonate was increased as compared with AAG mortar using only sodium hydroxide. But setting time was decreased. AAG mortar with sodium silicate and sodium sulfate was improved performance of compressive strength and setting time.
송진규(Song Jin-Gyu),김선영(Kim Sun-Young),양근혁(Yang Keun-Hyeok),변항용(Byun Hang-Yong),박정균(Park Jeong-Kyun) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
The paper describes an experimental study on the shear strengthening of concrete beams with exposed wire rope. The strengthening method is using the mechanical bolting of wire rope tensioned on the exterior of beam section. There are two shear strengthening types. The first is closed type wrapped beam section with wire rope like as closed stirrup. The second is U type tensioned at the anchor located in the side of beam section. The results showed that the ultimate shear strength and ductility of strengthened beams increased significantly compared with non-strengthened beams. Especially, the strengthening effect of closed type was very preferable to U type. Therefore, the shear strengthening method with wire rope is very reasonable in view of repair and rehabilitation of beams.
N2 Method를 이용한 RC IMRFs의 내진성능 평가
송진규 ( Song Jin Gyu ),윤정배 ( Yoon Jeong Bae ),이철호 ( Lee Chul Ho ),최정욱 ( Choi Jung Wok ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
Code based earthquake resistance design approach has some major shortcomings linked to the current R factor though it has a conceptual background for safety. As evidenced by the interstory drift index(IDI) analysis results of this study for IMRFs, current R-factor based (or, Life Safety based) design tends to fail in fulfilling other implicit and hopeful performance objectives such as Immediate Occupancy and Collapse Prevention. Performance based design(PBD) appears to be a promising approach to meet the multi level seismic performance objectives assigned to the building structures of nowadays.