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실내모형실험을 통한 인홀형 탄성파콘 시험의 적용성 분석
장인성(Jang In-Sung),정민재(Jung Min-Jae),권오순(Kwon O-Soon),목영진(Mok Young-Jin) 대한토목학회 2008 대한토목학회논문집 C Vol.28 No.2
탄성파 피에조콘 관입시험(Seismic piezocone penetration test, SCPTu)은 콘 관입 저항값과 간극수압 거동 특성 외에도 지반의 동적 특성을 측정할 수 있는 시험법이지만, 해상 조사의 경우 탄성파를 일으키는 발진(Source) 장치를 설치하기가 상당히 힘들기 때문에 SCPTu를 이용하여 해양 지반에 대한 동적 물성치를 파악하는데 어려움이 있다. 따라서 해양 지반의 동적 물성치 파악을 위하여 벤더 엘리먼트를 이용한 인홀형 탄성파 탐시콘(Inhole type CPTu)을 개발하였는데, 이는 콘 롯드(rod) 내부에 발진기(Source)와 수진기(Receiver)를 내재하고 있기 때문에 외부의 부가적인 발진기가 필요 없어 육상 뿐만아니라 해상에서도 충분히 활용할 수 있다. 이번 연구에서는 인홀형 탄성파콘의 적용성을 분석하기 위해 카올리나이트를 활용한 실내 모형 토조실험을 수행하였는데 카올리나이트 지반의 전단파 속도를 시간에 따라 측정하였고, 또한 발진부와 수진부 사이의 거리를 다양하게 바꿔가면서 발진기와 수진기가 설치될 때 발생하는 지반 교란의 영향을 검토하였다. Seismic piezocone penetration tests (SCPTu) can be used to obtain dynamic properties of soils as well as cone resistance and penetration pore pressure. However, the SCPTu system can be hardly utilized in marine soils because it is difficult to install the source apparatus which generates the shear wave in offshore site. The authors developed an inhole type piezocone penetration test (CPTu) equipment which both source and receiver composed of bender elements were installed inside the rod located behind the cone. Therefore, it can be applicable to even an offshore site without any additional source apparatus. The objective of this paper is to investigate the practical application of inhole type CPTu by performing laboratory model tests using kaolinite as soft clay. The shear wave velocities of kaolinite soil were measured with time, and the effects of soil disturbance due to the installation of source and receiver were also examined for various distance between source and receiver.
천성철(Chun Sung-Chul),조대진(Cho Dae-Jin),우성우(Woo Sung-Woo),최장호(Choi Jang-Ho),정재오(Jung Jae-O),고한명(Ko Han-Myung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4
Life styles of occupants may change during whole life of an apartment as the lifetime of the building gets longer. Therefore, spatial flexibility in apartments becomes more important. New structural systems and architectural plans should be developed to meet requirements of spatial flexibility. The Ministry of Construction and Transportation (MOCT) recently stipulated several special regulations regarding spatial flexibility and encouraged a flat plate system instead of a shear wall system by providing incentive for the upper limit of prices and floor space indices of apartments. In this paper, a flat plate system with edge beams is developed to replace a shear wall system for conventional apartments. A shear wall system has been optimized for apartments in Korea. The applicability and the construction cost of a new developed structural system with advanced spatial flexibility should be investigated compared with the shear wall system. To assess the construction cost and the applicability of the flat plate system, total 24 buildings are designed and the costs are evaluated. Two types of plans (tower and rectangular) and two kinds of space (110m2 and 140m2) are selected. The buildings have three kinds of stories, 15, 25 and 35 (30 stories for rectangular type). Buildings with a flat plate system are designed to have similar structural performance to buildings with a shear wall system. The total costs of structural frames and dry walls for partitions are evaluated for the proposed flat plate system with varying stories, types, and size of houses. The results of this research can be used in determining feasibility of residential projects.
유한요소해석을 통한 iTECH의 전단 성능에 관한 해석적 연구
정재오,김도현,주영규,이재홍,김상대 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Experimental evaluations for the iTECH beam System, which is invented for the purpose of making a lower height in steel structures, have been studied a lot for many years. In addition, they show the possibility of being developed as a new system when the iTECH beam system is applied in construction fields. However, the experiments were carried out without preceding theoretical analyses. Thus, it is intended to supplement some parts of the experiments by analyses and to provide the basis on future studies. iTECH Beam evaluated structural function through moment, shear, joint experiment and proposed formula. While this experiment, shear formula proposed assuming that steel web is all shown similar shear behavior about shear component element. This paper tries to verify assumption for analyzing shear behavior through FEA method.