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15층 철근콘크리트 건물에 설치된 통신설비 면진장치 동적 거동에 대한 실험적 연구
최형석,정동혁,서영득,백은림,Choi, Hyoung Suk,Jung, Donghyuk,Seo, Young Deuk,Baek, Eun Rim 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.6
Communication facilities play an essential role in disaster situations. Therefore, communication facilities need to have structural and functional safety during and after earthquakes. Recently, technology for partial seismic isolation has been increasing to protect data facilities and communication equipment installed in buildings from earthquakes. However, excessive displacement may occur in the seismic isolator during an earthquake due to the resonance between the building and the seismic isolator having long-period characteristics, which may cause overturning and separation of the installed equipment. In this study, analytical and experimental studies were conducted to evaluate the safety of seismic isolators installed in high-rise buildings. It was confirmed that damages might occur in buildings' seismic isolator, with resonance characteristics of less than 1 Hz.
최형석(Choi Hyoung Suk),이봉조(Lee Bong Jo),장준환(Jang Jun Hwan),김성도(Kim Seong Do),정진환(Cheung Jin Hwan) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
This study tested 81 rectangular concrete beams strengthened with externally bonded fiber sheets(aramid, carbon and glass) to compare the characteristics of flexural behavior. The tests were controlled by steel ratio and reinforcing ratio. The experimental results indicated that the contribution of externally bonded FRP to the flexural behavior was significant. Ultimate load is increased more than 220% and yield strength is up to 44%. Carbon sheet is the most useful material to force up the needed load. However the design of carbon sheet must consider not only ultimate load but yield strength.
최형석(Choi, Hyoung-Suk),김남식(Kim, Nam-Sik),정진환(Cheung, Jin-Hwan) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10
As the testing instrument for seismic research, the multi-platform shaking table system of SESTEC in the Pusan National University was introduced to suggest the multi-support shaking table testing methods and also to investigate its ability and applicability. 2 spans single-pylon cable-stayed bridge model, 3 spans girder bridge model and nuclear piping system model are presented and the acceleration and displacement table feedbacks of the each tests are compared to verify the simultaneous excitation ability in time domain and frequency domain.
최형석 ( Choi Hyoung Suk ),이봉조 ( Lee Bong Jo ),장준환 ( Jang Jun Hwan ),김성도 ( Kim Seong Do ),정진환 ( Cheung Jin Hwan ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
This study tested 81 rectangular concrete beams strengthened with externally bonded fiber sheets(aramid, carbon and glass) to compare the characteristics of flexural behavior. The tests were controlled by steel ratio and reinforcing ratio. The experimental results indicated that the contribution of externally bonded FRP to the flexural behavior was significant. Ultimate load is increased more than 220% and yield strength is up to 44%. Carbon sheet is the most useful material to force up the needed load. However the design of carbon sheet must consider not only ultimate load but yield strength.
탄소섬유시트로 보강한 콘크리트 보의 온도변화에 따른 부착계면거동
최형석 ( Choi Hyoung-suk ),김성도 ( Kim Seong-do ),이명진 ( Lee Myoung-jin ),정진환 ( Cheung Jin-hwan ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
This paper presents the theoretical analysis and the experimental results for the interfacial behavior of concrete beams strengthened with carbon fiber sheets by thermal effect. The theoretical solution, which was assumed that all materials are linear and elastic, was obtained and the test of environmental temperature change was performed to compare with the numerical results. In case of temperature change by 30℃, 1,573 tensile strain was produced in the sheet and the interfacial shear stress in the end of sheet has increased over 37%. Therefore, using the carbon fiber sheets to strengthen the concrete beam, it is necessary to consider the long term behavior under the environment of temperature change.