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서수연 ( Seo Soo-yeon ),윤승조 ( Yoon Seung-joe ),최기봉 ( Choi Ki-bong ),이수민 ( Lee Su-min ),이동화 ( Lee Dong-hwa ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
Various purposes and capacity are needed in order to maintain functions of a building during the using period. But a natural disaster brings a drop of capacity of buildings regardless of human’s effort. Recently, importance of countermeasure in regard to the occurred earthquake is emphasized by bigger shape of earthquake and diversification of earthquake type little by little in the future. The object of this paper is the evaluation of structural capacity of building damaged by disaster. In order to describe the damage, three frame building, five, ten and fifteen story buildings are designed to have reduced column strength in first floor. And static push over analysis for those buildings with various ground conditions is carried out by using RAM PERFORM program. From the analysis, it was shown that seismic capacity of frame building closely depended on the ground condition. The loss of structural capacity of buildings was more influenced by strength reduction of reinforcement than by that of concrete.
건물 지하벽 시공을 위한 EG-Frame 시스템의 필러 연결부 지압강도
서수연(Seo, Soo-Yeon),김강수(Kim, Kang-Su) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.10
The objective of this paper is to evaluate the structural safety of EG-Frame system resisting the earth pressure from CIP (Cast-in Place Pile). To accomplish the objective, a compression experiment and FE (Finite Element) analysis for the filler joint in EG-Frame were performed and suggested a proper design process. In the experiment, parameters are the width of the composite beam and the size of bearing plate. In FE analysis, total strain crack model was used for the modeling the concrete in the composite beam and CIP. the joint of CIP and composite beam was modeled as a perfect bond condition. From the experiment, it was shown that a separation of concrete composite beam appeared after shear failure when the width increased. The compressive strength depended on the size of bearing plate. However, there was not a trend of stiffness variation even if the size of bearing plate increased. In the case of same bearing plate, the strength decreased corresponding to the increase of width of the composite beam. It is thought that the round shape of CIP contributed the increase of the shear slip between the contact surfaces of the composite beam and CIP when the width increased.
지하합성벽의 Shear Connector 형태에 따른 전단내력에 관한 실험 연구
서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Joe),하기주(Ha Gee-Joo),윤용대(Yoon Yong-Dae) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In general, conventional sheeting H-pile is often used as a temporary member installed upon construction of outer retaining wall at basement floor. However, it is noted that H-pile and reinforced concrete wall with certain thickness can be effectively composited by shear connectors. Hence, in order to acquire possible higher resistances from composite behaviors of both H-pile and concrete wall structure, this study intends to study the behavior of shear studs for composite wall structure under shear stress, and know the effects of higher ductility from using U-reinforcement and stirrup with different forms of shear connector. Push out test is performed for four specimens and their resistances are analyzed. From the test, the shear resistance was increased by using U or closed C type connectors.
일사량을 고려한 상부슬래브의 온도하중에 대한 거동 특성
서수연(Seo Soo-Yeon),조용만(Cho Yong-Man),김경태(Kim Kyong-Tae),윤승조(Yoon Seung-Joe),윤현도(Yun Hyun-Do),최기봉(Choi Gi-Bong) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The purpose of this study is to perform an experiment to determine how much the temperature stress that works on roof slab due to differences in temperature on the surface of structure, may have effects on the long-term behaviors of structure, and thereby provide a useful reference material for measuring the serviceability of architectural structures. Based on actual survey data from Korea Meteorological Administration (KMA), the experiment is planned by calculating differences in the surface temperature of the structure in terms of insolation, as well as getting differences in temperature distribution of the upper slab structure. Next, the results are converted into cyclic temperature stress. The stress is applied to structures, depending on each experimental variable. Test result showed that the stiffness at nonlinear region after the experiment temperature stress of 20years.
서수연(Seo, Soo-Yeon),전수민(Jeon, Su-Min) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.1
Recently, a research related to development of form-block has been performed to improve the effectiveness in both construction of new building and retrofit of old building. From several previous prism tests on the form-block wall (FBW), it has been revealed that the concrete filled in the void of the form-block expands to horizontal direction when the compressive load increases and the failure of FBW at ultimate load is governed by the shear failure of web of form-block. This failure brings on weak resistance of wall. In this manner, this paper aimed to verify the compressive strength of the form-block reinforced with steel fiber through both compressive and prism test on the block. In addition, the suitability of previous equation to predict the prism strength of form-block is evaluated. Main parameters in the experiment are type of steel fiber, strength of grout and mortar, and strength of base mortar. As a result, the compressive strength of block and prism strength were improved by adding 1% of steel fiber into block. The ductility of block with steel fiber was improved but was not in prism test. The prism strength of the form-block wall can be properly predicted by using the AIJ equation.
탄소섬유메쉬와 모르터로 전단 보강된 RC보의 거동에 관한 연구
서수연 ( Seo Soo-yeon ),윤승조 ( Yoon Seung-joe ),이우진 ( Lee Woo-jin ),이종규 ( Lee Jong-kyu ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 논문집 Vol.8 No.2
본 연구의 목적은 CFM으로 전단 보강된 보의 실험으로 CFM의 전단 보강 효과를 평가하는 것으로서, 실험 변수는 메쉬의 배치 방향, 정착 클립의 개수, 전단 스팬비이다. 실험에서, 전체적으로 모르터와 RC보에서의 부착 파괴는 가력 초기부터 발생하여 최대 내력의 약 60% 정도에서 완전히 파괴되었으며, 전단 내력에 대한 CFM의 기여도는 CFM 최대 인장 강도의 약 19.6%인 것으로 나타났다. 또한 전단 스팬비가 1.0인 경우 대각선 방향으로 메쉬를 배치할 때 전단 보강 효과가 높은 것으로 나타났으나, 1.5인 시험체의 경우, 정착 클립의 개수가 많을 경우 보강 효과가 높은 것으로 나타났다. The purpose of this study is to investigate shear strengthening effects and behaviour of RC beams strengthened in shear by Carbon Fiber Mesh(CFM) and mortar for fixing CFM to concrete. Test parameters in experiment are shear span-to-depth ratio, layout of CFM and number of clip. From the test, it was shown that the governing failure patten was the bond failure between cover mortar and RC beam initiated at about 60% of maximum strength. And the strength of CFM was developed up to 19.6% of it's maximum tensile strength when the specimen reached to failure. The most effective enhancement using CFM and mortar were to attach CFM diagonally to concrete in a/d of 1.0 and increase the number of cilps in a/d of 1.5, respectively.
서수연 ( Seo¸ S. Y. ),이용택 ( Lee¸ Y. T. ),이현호 ( Lee¸ H. H. ),이리형 ( Lee¸ L. H. ),천영수 ( Chun¸ Y. S. ),양지수 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
Retrofit method on flexural T shape wall of apartment is evaluated through an experimental work in this study. For two flexural walls damaged up to almost failure, reinforcements yielded and concrete cracked below height of Id are replaced with new reinforcements and concrete, respectively. Two retrofit method, one is attaching aramid sheet to the surface of specimen, the other placing additional reinforcements in the web and replacing hoop for boundary elements. Horizontal cyclic loads are applied to the top of the specimen with constant axial load. It was shown that the structural capacity of damaged walls could be recovered by placing additional reinforcement in the section of wall. However, in case of using aramid sheet as flexural reinforcement for retrofitting, it is necessary to consider the loss of structural capacity due to the anchor problem at the end of sheet.