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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.
점성유체 감쇠기가 설치된 구조물의 지지 가새 강성을 고려한 지진응답
송진규(Song Jin-Gyu),김진상(Kim Jin-Sang),김재환(Kim Jae-Hwan),최정욱(Choi Jung-Wook),윤정배(Yoon Jeong-Bae) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.7
The structural seismic responses with viscous fluid damper were investigated for the multi-story steel braced frames. The analytical modeling including brace stiffness ratio was studied for the response of SDOF system using state equation and direct integration method. Displacement responses from two different methods were compared with various support brace stiffness ratio. The results from two analytical methods were almost same and constant responses were shown in the case of 1.0 or more of brace stiffness ratio. Therefore, most efficient value of brace stiffness was 1.0. For the MDOF system application with viscous fluid damper, seismic performance estimation considering the proposed modeling was investigated based on capacity spectrum method (CSM) and inelastic time history analysis. For the different brace stiffness ratio, different performances were shown. Finally, performance results including proposed modeling by the capacity spectrum method were slight different from the results of inelastic time history. It was shown more precise modeling and methodology were required for the performance estimation using capacity spectrum method.